TY  - CONF
AU  - Šljivić-Ivanović, Marija Z.
AU  - Jelić, Ivana
AU  - Dimović, Slavko
AU  - Vujović, Zoran
AU  - Plećaš, Ilija
PY  - 2019
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11895
AB  - Informal settlements are human settlements which, for various reasons, do not fulfill the conditions for legal recognition. The large-scale informal construction has resulted in an unplanned expansion of zones around cities suburb, usurpation of agricultural and public land and huge development problems regarding social, traffic and communal infrastructure, as well as the environment. Informal settlements are usually connected to an electrical and telecommunication network, and rarely on the water supply network. The most serious problem is the lack of sewage systems (less than 30%) due to high costs, which is further associated with adverse environmental impacts. A similar situation occurs with garbage collection and storage. In many cases the common informal communal equipment exists, but below prescribed standards which often threaten the ecological and living conditions. During the rapid development when regions are facing economic changes and challenges arising from environmental threats, various institutions have adopted numerous planning documents. One of them is the EU Directive on Strategic Environmental Assessment (SEA). The SEA aims are regulation, i.e. legalization and improving informal settlements in the environmental and sustainable manner, as well as prevention of their future forming. The SEA is particularly relevant in the context of transition countries that a numerous strategies decisions are made with significant implications on the environment. Practically, all these countries have introduced SEA into their legal framework. National legislation relating to the environment usually are contained in one law (Environmental law), but in some states, the regulatory framework for environmental issues is very developed, as in Serbia by the several laws concerning the environment. A similar regulatory framework exists in Bosnia and Herzegovina (BiH), Macedonia and Bulgaria. The phenomenon of informal settlements is very noticeable in Montenegro, Turkey, BiH, Serbia, and Albania, while Slovenia, Bulgaria, and Moldova do not face any serious problems regarding this matter.
PB  - Belgrade : Association of Chemists and Chemical Engineers of Serbia (UHTS)
C3  - IMPEDE 2019 : International scientific conference Environmental impact of illegal construction, poor planning and design : Conference proceedings
T1  - Impact of Informal Settlements on the Environment in Southeast Europe – A Review
SP  - 65
EP  - 71
DO  - 10.5281/zenodo.8348609
ER  - 

@conference{
author = "Šljivić-Ivanović, Marija Z. and Jelić, Ivana and Dimović, Slavko and Vujović, Zoran and Plećaš, Ilija",
year = "2019",
abstract = "Informal settlements are human settlements which, for various reasons, do not fulfill the conditions for legal recognition. The large-scale informal construction has resulted in an unplanned expansion of zones around cities suburb, usurpation of agricultural and public land and huge development problems regarding social, traffic and communal infrastructure, as well as the environment. Informal settlements are usually connected to an electrical and telecommunication network, and rarely on the water supply network. The most serious problem is the lack of sewage systems (less than 30%) due to high costs, which is further associated with adverse environmental impacts. A similar situation occurs with garbage collection and storage. In many cases the common informal communal equipment exists, but below prescribed standards which often threaten the ecological and living conditions. During the rapid development when regions are facing economic changes and challenges arising from environmental threats, various institutions have adopted numerous planning documents. One of them is the EU Directive on Strategic Environmental Assessment (SEA). The SEA aims are regulation, i.e. legalization and improving informal settlements in the environmental and sustainable manner, as well as prevention of their future forming. The SEA is particularly relevant in the context of transition countries that a numerous strategies decisions are made with significant implications on the environment. Practically, all these countries have introduced SEA into their legal framework. National legislation relating to the environment usually are contained in one law (Environmental law), but in some states, the regulatory framework for environmental issues is very developed, as in Serbia by the several laws concerning the environment. A similar regulatory framework exists in Bosnia and Herzegovina (BiH), Macedonia and Bulgaria. The phenomenon of informal settlements is very noticeable in Montenegro, Turkey, BiH, Serbia, and Albania, while Slovenia, Bulgaria, and Moldova do not face any serious problems regarding this matter.",
publisher = "Belgrade : Association of Chemists and Chemical Engineers of Serbia (UHTS)",
journal = "IMPEDE 2019 : International scientific conference Environmental impact of illegal construction, poor planning and design : Conference proceedings",
title = "Impact of Informal Settlements on the Environment in Southeast Europe – A Review",
pages = "65-71",
doi = "10.5281/zenodo.8348609"
}

Šljivić-Ivanović, M. Z., Jelić, I., Dimović, S., Vujović, Z.,& Plećaš, I.. (2019). Impact of Informal Settlements on the Environment in Southeast Europe – A Review. in IMPEDE 2019 : International scientific conference Environmental impact of illegal construction, poor planning and design : Conference proceedings
Belgrade : Association of Chemists and Chemical Engineers of Serbia (UHTS)., 65-71.
https://doi.org/10.5281/zenodo.8348609

Šljivić-Ivanović MZ, Jelić I, Dimović S, Vujović Z, Plećaš I. Impact of Informal Settlements on the Environment in Southeast Europe – A Review. in IMPEDE 2019 : International scientific conference Environmental impact of illegal construction, poor planning and design : Conference proceedings. 2019;:65-71.
doi:10.5281/zenodo.8348609 .

Šljivić-Ivanović, Marija Z., Jelić, Ivana, Dimović, Slavko, Vujović, Zoran, Plećaš, Ilija, "Impact of Informal Settlements on the Environment in Southeast Europe – A Review" in IMPEDE 2019 : International scientific conference Environmental impact of illegal construction, poor planning and design : Conference proceedings (2019):65-71,
https://doi.org/10.5281/zenodo.8348609 . .

TY  - CONF
AU  - Jelić, Ivana
AU  - Šljivić-Ivanović, Marija Z.
AU  - Dimović, Slavko
AU  - Vujović, Zoran
AU  - Plećaš, Ilija
PY  - 2019
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11896
AB  - This paper aims to summarize the main consequences of illegal building development for the environment. The negative factors of this phenomenon will be discussed according to the available literature data. The illegally built buildings often disrupt the human living environment or ruin the landscape, agricultural or forest land. Buildings without urban permits might have negative impacts on biodiversity, and create geomorphological and hydrological problems (e.g. landslides, disturbance of watercourses or groundwater flows, etc.), which further could lead to many accidents, i.e. floods or inadequate water supply, food chain disruption, and pest appearance. Buildings with poor energy efficiency performance have negative impacts regarding climate change, contribute to atmospheric pollution and overconsumption of natural resources, especially of fossil fuels. The negative impacts range from aesthetic deterioration of landscape, threats to biodiversity and soil degradation to increased vulnerability of human settlements and health, local water contamination or drying of households’ draw wells. Uncontrolled generation of waste during building construction and use, as well as its disposal, especially in urban areas, could have major negative environmental impacts.
PB  - Belgrade : Association of Chemists and Chemical Engineers of Serbia (UHTS)
C3  - IMPEDE 2019 : International scientific conference Environmental impact of illegal construction, poor planning and design : Conference proceedings
T1  - The Consequences of Illegal Construction on the Environment
SP  - 72
EP  - 79
DO  - 10.5281/zenodo.8348597
ER  - 

@conference{
author = "Jelić, Ivana and Šljivić-Ivanović, Marija Z. and Dimović, Slavko and Vujović, Zoran and Plećaš, Ilija",
year = "2019",
abstract = "This paper aims to summarize the main consequences of illegal building development for the environment. The negative factors of this phenomenon will be discussed according to the available literature data. The illegally built buildings often disrupt the human living environment or ruin the landscape, agricultural or forest land. Buildings without urban permits might have negative impacts on biodiversity, and create geomorphological and hydrological problems (e.g. landslides, disturbance of watercourses or groundwater flows, etc.), which further could lead to many accidents, i.e. floods or inadequate water supply, food chain disruption, and pest appearance. Buildings with poor energy efficiency performance have negative impacts regarding climate change, contribute to atmospheric pollution and overconsumption of natural resources, especially of fossil fuels. The negative impacts range from aesthetic deterioration of landscape, threats to biodiversity and soil degradation to increased vulnerability of human settlements and health, local water contamination or drying of households’ draw wells. Uncontrolled generation of waste during building construction and use, as well as its disposal, especially in urban areas, could have major negative environmental impacts.",
publisher = "Belgrade : Association of Chemists and Chemical Engineers of Serbia (UHTS)",
journal = "IMPEDE 2019 : International scientific conference Environmental impact of illegal construction, poor planning and design : Conference proceedings",
title = "The Consequences of Illegal Construction on the Environment",
pages = "72-79",
doi = "10.5281/zenodo.8348597"
}

Jelić, I., Šljivić-Ivanović, M. Z., Dimović, S., Vujović, Z.,& Plećaš, I.. (2019). The Consequences of Illegal Construction on the Environment. in IMPEDE 2019 : International scientific conference Environmental impact of illegal construction, poor planning and design : Conference proceedings
Belgrade : Association of Chemists and Chemical Engineers of Serbia (UHTS)., 72-79.
https://doi.org/10.5281/zenodo.8348597

Jelić I, Šljivić-Ivanović MZ, Dimović S, Vujović Z, Plećaš I. The Consequences of Illegal Construction on the Environment. in IMPEDE 2019 : International scientific conference Environmental impact of illegal construction, poor planning and design : Conference proceedings. 2019;:72-79.
doi:10.5281/zenodo.8348597 .

Jelić, Ivana, Šljivić-Ivanović, Marija Z., Dimović, Slavko, Vujović, Zoran, Plećaš, Ilija, "The Consequences of Illegal Construction on the Environment" in IMPEDE 2019 : International scientific conference Environmental impact of illegal construction, poor planning and design : Conference proceedings (2019):72-79,
https://doi.org/10.5281/zenodo.8348597 . .

TY  - CONF
AU  - Plećaš, Ilija
AU  - Jelić, Ivana V.
AU  - Kostić, Miloš
AU  - Aleksić, Srđan
PY  - 2015
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11459
AB  - To assess the safety of disposal of radioactive waste material in cement, curing conditions and time of leaching radionuclides 137Cs have been studied. Leaching tests in cement-ion exchange resins-bentonite matrix, were carried out in accordance with a method recommended by IAEA. Curing conditions and curing time prior to commencing the leaching test are critically important in leach studies since the extent of hydration of the cement materials determines how much hydration product develops and whether it is available to block the pore network, thereby reducing leaching. Incremental leaching rates Rn(cm/d) of 137 Cs from cement-ion exchange resins-bentonite matrix after 60 days were measured. In this paper we compared two bentonite clay as sorption componente, from Japan and Serbia. The results presented in this paper are examples of results obtained in a 30-year concrete testing project which will influence the design of the engineer trenches system for future central Serbian radioactive waste disposal center.
AB  - Da bi se procenila bezbednost odlaganje radioaktivnog otpadnog materijala u cementu, prouĉavan je stepen izluţivanja radionuklida 137Cs. Testovi izluţivanja radjeni su za kompoziciju cementa-jonoizmenjivaĉke smole i bentonita i sprovedene su u skladu sa postupkom preporuĉenog od IAEA. Vreme sušenja pre otpoĉinjanja liĉing testa je od suštinske vaţnosti u studijama izluţivanja, jer uticaj hidratacije cementa odreĊuje koliko se hidratacija proizvoda razvija i da li je od uticaja na blokadu pora, ĉime se smanjuje curenje radionuklida iz matriksa . U ovom radu poredjena su dva bentonita kao sorpcione komponente , iz Japana i Srbije . Rezultati prikazani u ovom radu su primeri rezultata 30-godišnjeg projekta sistema inţenjerskih rovova za buduće srpsko centralno odlagalište radioaktivnog otpada.
PB  - Beograd : Univerzitet u Beogradu, Institut za nuklearne nauke "Vinča"
PB  - Beograd : Društvo za zaštitu od zračenja Srbije i Crne Gore
C3  - 28. симпозијум ДЗЗСЦГ : зборник радова
T1  - Comparative Study of Japanaise and Serbian Bentonite in Cement-Ion Exchange Resins-Bentonite Clay Composition
T1  - Poređenje japanskih i srpskih bentonita u kompoziciji cement-jonoizmenjivačka smola-bentonitna glina
SP  - 379
EP  - 386
UR  - https://hdl.handle.net/21.15107/rcub_vinar_11459
ER  - 

@conference{
author = "Plećaš, Ilija and Jelić, Ivana V. and Kostić, Miloš and Aleksić, Srđan",
year = "2015",
abstract = "To assess the safety of disposal of radioactive waste material in cement, curing conditions and time of leaching radionuclides 137Cs have been studied. Leaching tests in cement-ion exchange resins-bentonite matrix, were carried out in accordance with a method recommended by IAEA. Curing conditions and curing time prior to commencing the leaching test are critically important in leach studies since the extent of hydration of the cement materials determines how much hydration product develops and whether it is available to block the pore network, thereby reducing leaching. Incremental leaching rates Rn(cm/d) of 137 Cs from cement-ion exchange resins-bentonite matrix after 60 days were measured. In this paper we compared two bentonite clay as sorption componente, from Japan and Serbia. The results presented in this paper are examples of results obtained in a 30-year concrete testing project which will influence the design of the engineer trenches system for future central Serbian radioactive waste disposal center., Da bi se procenila bezbednost odlaganje radioaktivnog otpadnog materijala u cementu, prouĉavan je stepen izluţivanja radionuklida 137Cs. Testovi izluţivanja radjeni su za kompoziciju cementa-jonoizmenjivaĉke smole i bentonita i sprovedene su u skladu sa postupkom preporuĉenog od IAEA. Vreme sušenja pre otpoĉinjanja liĉing testa je od suštinske vaţnosti u studijama izluţivanja, jer uticaj hidratacije cementa odreĊuje koliko se hidratacija proizvoda razvija i da li je od uticaja na blokadu pora, ĉime se smanjuje curenje radionuklida iz matriksa . U ovom radu poredjena su dva bentonita kao sorpcione komponente , iz Japana i Srbije . Rezultati prikazani u ovom radu su primeri rezultata 30-godišnjeg projekta sistema inţenjerskih rovova za buduće srpsko centralno odlagalište radioaktivnog otpada.",
publisher = "Beograd : Univerzitet u Beogradu, Institut za nuklearne nauke "Vinča", Beograd : Društvo za zaštitu od zračenja Srbije i Crne Gore",
journal = "28. симпозијум ДЗЗСЦГ : зборник радова",
title = "Comparative Study of Japanaise and Serbian Bentonite in Cement-Ion Exchange Resins-Bentonite Clay Composition, Poređenje japanskih i srpskih bentonita u kompoziciji cement-jonoizmenjivačka smola-bentonitna glina",
pages = "379-386",
url = "https://hdl.handle.net/21.15107/rcub_vinar_11459"
}

Plećaš, I., Jelić, I. V., Kostić, M.,& Aleksić, S.. (2015). Comparative Study of Japanaise and Serbian Bentonite in Cement-Ion Exchange Resins-Bentonite Clay Composition. in 28. симпозијум ДЗЗСЦГ : зборник радова
Beograd : Univerzitet u Beogradu, Institut za nuklearne nauke "Vinča"., 379-386.
https://hdl.handle.net/21.15107/rcub_vinar_11459

Plećaš I, Jelić IV, Kostić M, Aleksić S. Comparative Study of Japanaise and Serbian Bentonite in Cement-Ion Exchange Resins-Bentonite Clay Composition. in 28. симпозијум ДЗЗСЦГ : зборник радова. 2015;:379-386.
https://hdl.handle.net/21.15107/rcub_vinar_11459 .

Plećaš, Ilija, Jelić, Ivana V., Kostić, Miloš, Aleksić, Srđan, "Comparative Study of Japanaise and Serbian Bentonite in Cement-Ion Exchange Resins-Bentonite Clay Composition" in 28. симпозијум ДЗЗСЦГ : зборник радова (2015):379-386,
https://hdl.handle.net/21.15107/rcub_vinar_11459 .

TY  - JOUR
AU  - Plećaš, Ilija B.
AU  - Dimović, Slavko
AU  - Arbutina, Dalibor
PY  - 2015
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/435
AB  - An optimization of mortar (as matrix), improved with vermiculite clay, used for immobilization of radionuclide caesium-137 is presented. A relatively simple mathematical model is given, which permits minimization of leach rate and permeability and maximization of compressive strength. An optimal solution, based on experimental data, is given. These results will be used for a future radioactive waste disposal center in Serbia. (C) 2014 Elsevier Ltd. All rights reserved.
T2  - Progress in Nuclear Energy
T1  - Modeling of physico-chemical characteristics of mortar-waste mixture in radioactive waste management
VL  - 80
SP  - 86
EP  - 89
DO  - 10.1016/j.pnucene.2014.12.006
ER  - 

@article{
author = "Plećaš, Ilija B. and Dimović, Slavko and Arbutina, Dalibor",
year = "2015",
abstract = "An optimization of mortar (as matrix), improved with vermiculite clay, used for immobilization of radionuclide caesium-137 is presented. A relatively simple mathematical model is given, which permits minimization of leach rate and permeability and maximization of compressive strength. An optimal solution, based on experimental data, is given. These results will be used for a future radioactive waste disposal center in Serbia. (C) 2014 Elsevier Ltd. All rights reserved.",
journal = "Progress in Nuclear Energy",
title = "Modeling of physico-chemical characteristics of mortar-waste mixture in radioactive waste management",
volume = "80",
pages = "86-89",
doi = "10.1016/j.pnucene.2014.12.006"
}

Plećaš, I. B., Dimović, S.,& Arbutina, D.. (2015). Modeling of physico-chemical characteristics of mortar-waste mixture in radioactive waste management. in Progress in Nuclear Energy, 80, 86-89.
https://doi.org/10.1016/j.pnucene.2014.12.006

Plećaš IB, Dimović S, Arbutina D. Modeling of physico-chemical characteristics of mortar-waste mixture in radioactive waste management. in Progress in Nuclear Energy. 2015;80:86-89.
doi:10.1016/j.pnucene.2014.12.006 .

Plećaš, Ilija B., Dimović, Slavko, Arbutina, Dalibor, "Modeling of physico-chemical characteristics of mortar-waste mixture in radioactive waste management" in Progress in Nuclear Energy, 80 (2015):86-89,
https://doi.org/10.1016/j.pnucene.2014.12.006 . .

TY  - JOUR
AU  - Plećaš, Ilija B.
AU  - Arbutina, Dalibor
PY  - 2015
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/396
AB  - An optimization of concrete used for immobilization of radionuclides 60 Co and 137 Cs, is presented. A relatively simple mathematical model is given, which permits minimization of leach rate and permeability and maximization of compressive strength. An optimal solution, based on experimental data, is given. These results will be used for a future Serbian radioactivewaste disposal center.
T2  - Radiochimica Acta
T1  - Modeling of physico-chemical characteristics of concrete for filling trenches in radioactive waste management
VL  - 103
IS  - 2
SP  - 157
EP  - 160
DO  - 10.1515/ract-2014-2332
ER  - 

@article{
author = "Plećaš, Ilija B. and Arbutina, Dalibor",
year = "2015",
abstract = "An optimization of concrete used for immobilization of radionuclides 60 Co and 137 Cs, is presented. A relatively simple mathematical model is given, which permits minimization of leach rate and permeability and maximization of compressive strength. An optimal solution, based on experimental data, is given. These results will be used for a future Serbian radioactivewaste disposal center.",
journal = "Radiochimica Acta",
title = "Modeling of physico-chemical characteristics of concrete for filling trenches in radioactive waste management",
volume = "103",
number = "2",
pages = "157-160",
doi = "10.1515/ract-2014-2332"
}

Plećaš, I. B.,& Arbutina, D.. (2015). Modeling of physico-chemical characteristics of concrete for filling trenches in radioactive waste management. in Radiochimica Acta, 103(2), 157-160.
https://doi.org/10.1515/ract-2014-2332

Plećaš IB, Arbutina D. Modeling of physico-chemical characteristics of concrete for filling trenches in radioactive waste management. in Radiochimica Acta. 2015;103(2):157-160.
doi:10.1515/ract-2014-2332 .

Plećaš, Ilija B., Arbutina, Dalibor, "Modeling of physico-chemical characteristics of concrete for filling trenches in radioactive waste management" in Radiochimica Acta, 103, no. 2 (2015):157-160,
https://doi.org/10.1515/ract-2014-2332 . .

TY  - JOUR
AU  - Plećaš, Ilija B.
AU  - Nađđerđ, Laslo
AU  - Davidović, Miloš D.
PY  - 2013
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5422
AB  - A method for obtaining an optimal concrete container composition used for storing radioactive waste from nuclear power plants is developed. It is applied to the radionuclides Co-60, Cs-137, Sr-85, and Mn-54. A set of recipes for concrete composition leading to an optimal solution is given.
T2  - Nuclear technology and radiation protection
T1  - Optimisation By Mathematical Modeling of Physicochemical Characteristics of Concrete Containers in Radioactive Waste Management
VL  - 28
IS  - 1
SP  - 25
EP  - 30
DO  - 10.2298/NTRP1301025P
ER  - 

@article{
author = "Plećaš, Ilija B. and Nađđerđ, Laslo and Davidović, Miloš D.",
year = "2013",
abstract = "A method for obtaining an optimal concrete container composition used for storing radioactive waste from nuclear power plants is developed. It is applied to the radionuclides Co-60, Cs-137, Sr-85, and Mn-54. A set of recipes for concrete composition leading to an optimal solution is given.",
journal = "Nuclear technology and radiation protection",
title = "Optimisation By Mathematical Modeling of Physicochemical Characteristics of Concrete Containers in Radioactive Waste Management",
volume = "28",
number = "1",
pages = "25-30",
doi = "10.2298/NTRP1301025P"
}

Plećaš, I. B., Nađđerđ, L.,& Davidović, M. D.. (2013). Optimisation By Mathematical Modeling of Physicochemical Characteristics of Concrete Containers in Radioactive Waste Management. in Nuclear technology and radiation protection, 28(1), 25-30.
https://doi.org/10.2298/NTRP1301025P

Plećaš IB, Nađđerđ L, Davidović MD. Optimisation By Mathematical Modeling of Physicochemical Characteristics of Concrete Containers in Radioactive Waste Management. in Nuclear technology and radiation protection. 2013;28(1):25-30.
doi:10.2298/NTRP1301025P .

Plećaš, Ilija B., Nađđerđ, Laslo, Davidović, Miloš D., "Optimisation By Mathematical Modeling of Physicochemical Characteristics of Concrete Containers in Radioactive Waste Management" in Nuclear technology and radiation protection, 28, no. 1 (2013):25-30,
https://doi.org/10.2298/NTRP1301025P . .

TY  - JOUR
AU  - Plećaš, Ilija B.
AU  - Arbutina, D.
PY  - 2013
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5728
AB  - Two fundamental concerns must be addressed when attempting to isolate low-level waste in a disposal facility on land. The first concern is isolating the waste from water, or hydrologic isolation. The second is preventing movement of the radionuclides out of the disposal facility, or radionuclide migration. Particularly, we have investigated here the latter modified scenario. To assess the safety for disposal of radioactive waste-concrete composition, the leakage of Co-60 from a waste composite into a surrounding fluid has been studied. Leakage tests were carried out by original method, developed in Vinca Institute. Transport phenomena involved in the leaching of a radioactive material from a cement composite matrix are investigated using 3 methods based on theoretical equations. These are: the diffusion equation for a plane source, an equation for diffusion coupled to a first-order equation, and an empirical method employing a polynomial equation. The results presented in this paper are from a 35-year mortar and concrete testing project that will influence the design choices for radioactive waste packaging for a future Serbian radioactive waste disposal center.
T2  - Journal of Environmental Protection and Ecology
T1  - Modelling of Transport Phenomena in Concrete Porous Media
VL  - 14
IS  - 3
SP  - 1059
EP  - 1065
UR  - https://hdl.handle.net/21.15107/rcub_vinar_5728
ER  - 

@article{
author = "Plećaš, Ilija B. and Arbutina, D.",
year = "2013",
abstract = "Two fundamental concerns must be addressed when attempting to isolate low-level waste in a disposal facility on land. The first concern is isolating the waste from water, or hydrologic isolation. The second is preventing movement of the radionuclides out of the disposal facility, or radionuclide migration. Particularly, we have investigated here the latter modified scenario. To assess the safety for disposal of radioactive waste-concrete composition, the leakage of Co-60 from a waste composite into a surrounding fluid has been studied. Leakage tests were carried out by original method, developed in Vinca Institute. Transport phenomena involved in the leaching of a radioactive material from a cement composite matrix are investigated using 3 methods based on theoretical equations. These are: the diffusion equation for a plane source, an equation for diffusion coupled to a first-order equation, and an empirical method employing a polynomial equation. The results presented in this paper are from a 35-year mortar and concrete testing project that will influence the design choices for radioactive waste packaging for a future Serbian radioactive waste disposal center.",
journal = "Journal of Environmental Protection and Ecology",
title = "Modelling of Transport Phenomena in Concrete Porous Media",
volume = "14",
number = "3",
pages = "1059-1065",
url = "https://hdl.handle.net/21.15107/rcub_vinar_5728"
}

Plećaš, I. B.,& Arbutina, D.. (2013). Modelling of Transport Phenomena in Concrete Porous Media. in Journal of Environmental Protection and Ecology, 14(3), 1059-1065.
https://hdl.handle.net/21.15107/rcub_vinar_5728

Plećaš IB, Arbutina D. Modelling of Transport Phenomena in Concrete Porous Media. in Journal of Environmental Protection and Ecology. 2013;14(3):1059-1065.
https://hdl.handle.net/21.15107/rcub_vinar_5728 .

Plećaš, Ilija B., Arbutina, D., "Modelling of Transport Phenomena in Concrete Porous Media" in Journal of Environmental Protection and Ecology, 14, no. 3 (2013):1059-1065,
https://hdl.handle.net/21.15107/rcub_vinar_5728 .

TY  - JOUR
AU  - Plećaš, Ilija B.
AU  - Dimović, Slavko
PY  - 2012
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4624
AB  - An optimization of mortar (as matrix), improved with bentonite clay, used for immobilization of radionuclides (60)Co, (137)Cs, (85)Sr and (54)Mn, is presented. A relatively simple mathematical model is given, which permits minimization of leach rate and permeability and maximization of compressive strength. An optimal solution, based on experimental data, is given. These results will be used for a future Serbian radioactive waste disposal center. (C) 2011 Elsevier Ltd. All rights reserved.
T2  - Progress in Nuclear Energy
T1  - Mathematical modeling of physico-chemical characteristics of mortar-waste composites in radioactive waste management
VL  - 54
IS  - 1
SP  - 1
EP  - 4
DO  - 10.1016/j.pnucene.2011.09.010
ER  - 

@article{
author = "Plećaš, Ilija B. and Dimović, Slavko",
year = "2012",
abstract = "An optimization of mortar (as matrix), improved with bentonite clay, used for immobilization of radionuclides (60)Co, (137)Cs, (85)Sr and (54)Mn, is presented. A relatively simple mathematical model is given, which permits minimization of leach rate and permeability and maximization of compressive strength. An optimal solution, based on experimental data, is given. These results will be used for a future Serbian radioactive waste disposal center. (C) 2011 Elsevier Ltd. All rights reserved.",
journal = "Progress in Nuclear Energy",
title = "Mathematical modeling of physico-chemical characteristics of mortar-waste composites in radioactive waste management",
volume = "54",
number = "1",
pages = "1-4",
doi = "10.1016/j.pnucene.2011.09.010"
}

Plećaš, I. B.,& Dimović, S.. (2012). Mathematical modeling of physico-chemical characteristics of mortar-waste composites in radioactive waste management. in Progress in Nuclear Energy, 54(1), 1-4.
https://doi.org/10.1016/j.pnucene.2011.09.010

Plećaš IB, Dimović S. Mathematical modeling of physico-chemical characteristics of mortar-waste composites in radioactive waste management. in Progress in Nuclear Energy. 2012;54(1):1-4.
doi:10.1016/j.pnucene.2011.09.010 .

Plećaš, Ilija B., Dimović, Slavko, "Mathematical modeling of physico-chemical characteristics of mortar-waste composites in radioactive waste management" in Progress in Nuclear Energy, 54, no. 1 (2012):1-4,
https://doi.org/10.1016/j.pnucene.2011.09.010 . .

TY  - CONF
AU  - Stanković, Jelena
AU  - Stanić, Vojislav
AU  - Dimitrijević, Suzana I.
AU  - Mitrić, Miodrag
AU  - Jokić, Bojan M.
AU  - Plećaš, Ilija B.
AU  - Raičević, Slavica
PY  - 2011
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/6929
C3  - European Journal of Pharmaceutical Sciences
T1  - Antimicrobial Activity of Copper and Zinc-Doped Hydroxyapatite Nanopowders
VL  - 44
SP  - 195
EP  - 195
UR  - https://hdl.handle.net/21.15107/rcub_vinar_6929
ER  - 

@conference{
author = "Stanković, Jelena and Stanić, Vojislav and Dimitrijević, Suzana I. and Mitrić, Miodrag and Jokić, Bojan M. and Plećaš, Ilija B. and Raičević, Slavica",
year = "2011",
journal = "European Journal of Pharmaceutical Sciences",
title = "Antimicrobial Activity of Copper and Zinc-Doped Hydroxyapatite Nanopowders",
volume = "44",
pages = "195-195",
url = "https://hdl.handle.net/21.15107/rcub_vinar_6929"
}

Stanković, J., Stanić, V., Dimitrijević, S. I., Mitrić, M., Jokić, B. M., Plećaš, I. B.,& Raičević, S.. (2011). Antimicrobial Activity of Copper and Zinc-Doped Hydroxyapatite Nanopowders. in European Journal of Pharmaceutical Sciences, 44, 195-195.
https://hdl.handle.net/21.15107/rcub_vinar_6929

Stanković J, Stanić V, Dimitrijević SI, Mitrić M, Jokić BM, Plećaš IB, Raičević S. Antimicrobial Activity of Copper and Zinc-Doped Hydroxyapatite Nanopowders. in European Journal of Pharmaceutical Sciences. 2011;44:195-195.
https://hdl.handle.net/21.15107/rcub_vinar_6929 .

Stanković, Jelena, Stanić, Vojislav, Dimitrijević, Suzana I., Mitrić, Miodrag, Jokić, Bojan M., Plećaš, Ilija B., Raičević, Slavica, "Antimicrobial Activity of Copper and Zinc-Doped Hydroxyapatite Nanopowders" in European Journal of Pharmaceutical Sciences, 44 (2011):195-195,
https://hdl.handle.net/21.15107/rcub_vinar_6929 .

TY  - JOUR
AU  - Šljivić-Ivanović, Marija Z.
AU  - Smičiklas, Ivana D.
AU  - Plećaš, Ilija B.
AU  - Pejanović, Srđan
PY  - 2011
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4394
AB  - The kinetics of Cu2+ sorption on to zeolite, clay and diatomite was investigated as a function of initial metal concentrations. For consideration of the mass transfer phenomena, single resistance models based on both film and intraparticle diffusion were tested and compared. The obtained results suggested that the rate-limiting step in Cu2+ sorption strongly depended on the sorbent type, as well as on initial cation concentration. The decrease in external mass transfer coefficients with the increase in initial metal concentrations was in excellent agreement with expressions based on Sherwood and Schmidt dimensionless numbers. The internal diffusivities through zeolite particles were in the range 1.0 x 10-11 to 1.0 x 10-13 m2/min, depending on the Cu2+ concentration and the applied theoretical model.
T2  - Environmental Technology
T1  - The role of external and internal mass transfer in the process of Cu2+removal by natural mineral sorbents
VL  - 32
IS  - 9
SP  - 933
EP  - 943
DO  - 10.1080/09593330.2010.521952
ER  - 

@article{
author = "Šljivić-Ivanović, Marija Z. and Smičiklas, Ivana D. and Plećaš, Ilija B. and Pejanović, Srđan",
year = "2011",
abstract = "The kinetics of Cu2+ sorption on to zeolite, clay and diatomite was investigated as a function of initial metal concentrations. For consideration of the mass transfer phenomena, single resistance models based on both film and intraparticle diffusion were tested and compared. The obtained results suggested that the rate-limiting step in Cu2+ sorption strongly depended on the sorbent type, as well as on initial cation concentration. The decrease in external mass transfer coefficients with the increase in initial metal concentrations was in excellent agreement with expressions based on Sherwood and Schmidt dimensionless numbers. The internal diffusivities through zeolite particles were in the range 1.0 x 10-11 to 1.0 x 10-13 m2/min, depending on the Cu2+ concentration and the applied theoretical model.",
journal = "Environmental Technology",
title = "The role of external and internal mass transfer in the process of Cu2+removal by natural mineral sorbents",
volume = "32",
number = "9",
pages = "933-943",
doi = "10.1080/09593330.2010.521952"
}

Šljivić-Ivanović, M. Z., Smičiklas, I. D., Plećaš, I. B.,& Pejanović, S.. (2011). The role of external and internal mass transfer in the process of Cu2+removal by natural mineral sorbents. in Environmental Technology, 32(9), 933-943.
https://doi.org/10.1080/09593330.2010.521952

Šljivić-Ivanović MZ, Smičiklas ID, Plećaš IB, Pejanović S. The role of external and internal mass transfer in the process of Cu2+removal by natural mineral sorbents. in Environmental Technology. 2011;32(9):933-943.
doi:10.1080/09593330.2010.521952 .

Šljivić-Ivanović, Marija Z., Smičiklas, Ivana D., Plećaš, Ilija B., Pejanović, Srđan, "The role of external and internal mass transfer in the process of Cu2+removal by natural mineral sorbents" in Environmental Technology, 32, no. 9 (2011):933-943,
https://doi.org/10.1080/09593330.2010.521952 . .

TY  - JOUR
AU  - Dimović, Slavko
AU  - Smičiklas, Ivana D.
AU  - Šljivić-Ivanović, Marija Z.
AU  - Plećaš, Ilija B.
AU  - Slavković-Beškoski, Latinka J.
PY  - 2011
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4618
AB  - Bone char powder, composed mainly of poorly crystalline hydroxyapatite (Ca-10(PO4)(6)(OH)(2)), carbon and CaCO3, has potential applicability in the removal of Co2+ ions from contaminated effluents. In the present study, the influence of process parameters: particle size, agitation speed, initial pH and initial sorbate concentration, onto kinetics and mechanism of Co2+ sorption was studied and discussed. In order to describe and compare time evolution of the process under different conditions, the experimental data were analyzed using pseudo-first, pseudo-second and Vermeulens kinetic models. Generally, experimental results were best fitted with the pseudo-second-order model, which accurately predicted the equilibrium sorbed amounts. The pseudo-second-order rate constant was the most influenced by variations in initial metal concentration and pH, in the investigated ranges. The conclusions about sorption mechanism were derived based on Co2+ amounts sorbed during time, as well as considering solution pH changes, changes of Ca2+ amounts released into liquid phase and Ca2+/Co2+ molar ratios. It was concluded that rapid sorption stage was governed by surface complexation reactions, whereas the contribution of the ion-exchange mechanism increased with time and became more significant in the second, slower phase. Experimentally determined maximum sorption capacity towards Co2+, under optimal conditions, was found to be 0.38 mmol/g. The results show that bone char represents cost-effective alternative to synthetic hydroxyapatite sorbent.
T2  - Journal of Environmental Science and Health. Part A: Toxic Hazardous Substances and Environmental Engineering
T1  - The effect of process parameters on kinetics and mechanisms of Co2+ removal by bone char
VL  - 46
IS  - 13
SP  - 1558
EP  - 1569
DO  - 10.1080/10934529.2011.609454
ER  - 

@article{
author = "Dimović, Slavko and Smičiklas, Ivana D. and Šljivić-Ivanović, Marija Z. and Plećaš, Ilija B. and Slavković-Beškoski, Latinka J.",
year = "2011",
abstract = "Bone char powder, composed mainly of poorly crystalline hydroxyapatite (Ca-10(PO4)(6)(OH)(2)), carbon and CaCO3, has potential applicability in the removal of Co2+ ions from contaminated effluents. In the present study, the influence of process parameters: particle size, agitation speed, initial pH and initial sorbate concentration, onto kinetics and mechanism of Co2+ sorption was studied and discussed. In order to describe and compare time evolution of the process under different conditions, the experimental data were analyzed using pseudo-first, pseudo-second and Vermeulens kinetic models. Generally, experimental results were best fitted with the pseudo-second-order model, which accurately predicted the equilibrium sorbed amounts. The pseudo-second-order rate constant was the most influenced by variations in initial metal concentration and pH, in the investigated ranges. The conclusions about sorption mechanism were derived based on Co2+ amounts sorbed during time, as well as considering solution pH changes, changes of Ca2+ amounts released into liquid phase and Ca2+/Co2+ molar ratios. It was concluded that rapid sorption stage was governed by surface complexation reactions, whereas the contribution of the ion-exchange mechanism increased with time and became more significant in the second, slower phase. Experimentally determined maximum sorption capacity towards Co2+, under optimal conditions, was found to be 0.38 mmol/g. The results show that bone char represents cost-effective alternative to synthetic hydroxyapatite sorbent.",
journal = "Journal of Environmental Science and Health. Part A: Toxic Hazardous Substances and Environmental Engineering",
title = "The effect of process parameters on kinetics and mechanisms of Co2+ removal by bone char",
volume = "46",
number = "13",
pages = "1558-1569",
doi = "10.1080/10934529.2011.609454"
}

Dimović, S., Smičiklas, I. D., Šljivić-Ivanović, M. Z., Plećaš, I. B.,& Slavković-Beškoski, L. J.. (2011). The effect of process parameters on kinetics and mechanisms of Co2+ removal by bone char. in Journal of Environmental Science and Health. Part A: Toxic Hazardous Substances and Environmental Engineering, 46(13), 1558-1569.
https://doi.org/10.1080/10934529.2011.609454

Dimović S, Smičiklas ID, Šljivić-Ivanović MZ, Plećaš IB, Slavković-Beškoski LJ. The effect of process parameters on kinetics and mechanisms of Co2+ removal by bone char. in Journal of Environmental Science and Health. Part A: Toxic Hazardous Substances and Environmental Engineering. 2011;46(13):1558-1569.
doi:10.1080/10934529.2011.609454 .

Dimović, Slavko, Smičiklas, Ivana D., Šljivić-Ivanović, Marija Z., Plećaš, Ilija B., Slavković-Beškoski, Latinka J., "The effect of process parameters on kinetics and mechanisms of Co2+ removal by bone char" in Journal of Environmental Science and Health. Part A: Toxic Hazardous Substances and Environmental Engineering, 46, no. 13 (2011):1558-1569,
https://doi.org/10.1080/10934529.2011.609454 . .

TY  - JOUR
AU  - Stanić, Vojislav
AU  - Dimitrijević, Suzana I.
AU  - Antić-Stanković, Jelena
AU  - Mitrić, Miodrag
AU  - Jokić, Bojan M.
AU  - Plećaš, Ilija B.
AU  - Raičević, Slavica
PY  - 2010
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4013
AB  - Antimicrobial materials based on hydroxyapatite are potentially attractive in a wide variety of medical applications. The synthesis of copper and zinc-doped hydroxyapatite was done by neutralization method. This method consists of dissolving CuO or ZnO in solution of H(3)PO(4), and the slow addition to suspension of Ca(OH)(2) for obtaining monophasic product. Characterization studies from XRD, SEM, TEM and FTIR spectra showed that particles of all samples are of nano size and they do not contain any discernible crystalline impurity. The quantitative elemental analysis showed that the copper and zinc ions fully incorporated into the hydroxyapatite. The antimicrobial effects of doped hydroxyapatite powders against pathogen bacterial strains Escherichia coli, Staphylococcus aureus and pathogen yeast Candida albicans were tested in solid and liquid media. Quantitative test in liquid media clearly showed that copper and zinc-doped samples had viable cells reduction ability for all tested strains. (C) 2010 Elsevier B. V. All rights reserved.
T2  - Applied Surface Science
T1  - Synthesis, characterization and antimicrobial activity of copper and zinc-doped hydroxyapatite nanopowders
VL  - 256
IS  - 20
SP  - 6083
EP  - 6089
DO  - 10.1016/j.apsusc.2010.03.124
ER  - 

@article{
author = "Stanić, Vojislav and Dimitrijević, Suzana I. and Antić-Stanković, Jelena and Mitrić, Miodrag and Jokić, Bojan M. and Plećaš, Ilija B. and Raičević, Slavica",
year = "2010",
abstract = "Antimicrobial materials based on hydroxyapatite are potentially attractive in a wide variety of medical applications. The synthesis of copper and zinc-doped hydroxyapatite was done by neutralization method. This method consists of dissolving CuO or ZnO in solution of H(3)PO(4), and the slow addition to suspension of Ca(OH)(2) for obtaining monophasic product. Characterization studies from XRD, SEM, TEM and FTIR spectra showed that particles of all samples are of nano size and they do not contain any discernible crystalline impurity. The quantitative elemental analysis showed that the copper and zinc ions fully incorporated into the hydroxyapatite. The antimicrobial effects of doped hydroxyapatite powders against pathogen bacterial strains Escherichia coli, Staphylococcus aureus and pathogen yeast Candida albicans were tested in solid and liquid media. Quantitative test in liquid media clearly showed that copper and zinc-doped samples had viable cells reduction ability for all tested strains. (C) 2010 Elsevier B. V. All rights reserved.",
journal = "Applied Surface Science",
title = "Synthesis, characterization and antimicrobial activity of copper and zinc-doped hydroxyapatite nanopowders",
volume = "256",
number = "20",
pages = "6083-6089",
doi = "10.1016/j.apsusc.2010.03.124"
}

Stanić, V., Dimitrijević, S. I., Antić-Stanković, J., Mitrić, M., Jokić, B. M., Plećaš, I. B.,& Raičević, S.. (2010). Synthesis, characterization and antimicrobial activity of copper and zinc-doped hydroxyapatite nanopowders. in Applied Surface Science, 256(20), 6083-6089.
https://doi.org/10.1016/j.apsusc.2010.03.124

Stanić V, Dimitrijević SI, Antić-Stanković J, Mitrić M, Jokić BM, Plećaš IB, Raičević S. Synthesis, characterization and antimicrobial activity of copper and zinc-doped hydroxyapatite nanopowders. in Applied Surface Science. 2010;256(20):6083-6089.
doi:10.1016/j.apsusc.2010.03.124 .

Stanić, Vojislav, Dimitrijević, Suzana I., Antić-Stanković, Jelena, Mitrić, Miodrag, Jokić, Bojan M., Plećaš, Ilija B., Raičević, Slavica, "Synthesis, characterization and antimicrobial activity of copper and zinc-doped hydroxyapatite nanopowders" in Applied Surface Science, 256, no. 20 (2010):6083-6089,
https://doi.org/10.1016/j.apsusc.2010.03.124 . .

TY  - JOUR
AU  - Smičiklas, Ivana D.
AU  - Dimović, Slavko
AU  - Šljivić-Ivanović, Marija Z.
AU  - Plećaš, Ilija B.
AU  - Lončar, Boris B.
AU  - Mitrić, Miodrag
PY  - 2010
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4011
AB  - The interaction between Sr2+ ions and variously treated animal bones was studied from the aspect of Sr-90 isotope immobilization from the contaminated effluents. As a source of biogenic, poorly-crystalline apatite, bone based materials, in general, were found to exhibit good retention properties towards Sr2+ cation. Furthermore, sorption capacities of H2O2 treated bone sample and sample annealed at 400 degrees C were found to be higher in respect to a commercial bone char and synthetic hydroxyapatite. Mentioned treatments induced partial organic phase removal from the pores of the skeletal material that caused the increase of the specific surface area. Higher temperatures provoked an increase of the apatite phase crystallinity, agglomeration of nano-crystals and a decrease of both the specific surface area and Sr2+ sorption. The immobilization was pH independent in the range 4-10, as a result of sorbents buffering properties. Kinetic data were well represented by the pseudo-second-order reaction model. Sorption isotherms were in better correlation with Freundlich than Langmuir theoretical model, whereas samples heated at 800 degrees C and 1000 degrees C showed S-type isotherms which were in a good agreement with sigmoidal Langmuir equation. The ion-exchange with Ca2+ cations and the specific cation sorption were two recognized mechanisms in the Sr2+ removal process, with relative contributions strongly dependent on the sorbents physicochemical properties. Sr2+ -loaded products were the most stable in the neutral and alkaline environments, while Ca2+ containing and acidic leaching solutions caused increased Sr2+ desorption. (C) 2010 Elsevier B.V. All rights reserved.
T2  - Journal of Nuclear Materials
T1  - Resource recovery of animal bones: Study on sorptive properties and mechanism for Sr2+ ions
VL  - 400
IS  - 1
SP  - 15
EP  - 24
DO  - 10.1016/j.jnucmat.2010.02.004
ER  - 

@article{
author = "Smičiklas, Ivana D. and Dimović, Slavko and Šljivić-Ivanović, Marija Z. and Plećaš, Ilija B. and Lončar, Boris B. and Mitrić, Miodrag",
year = "2010",
abstract = "The interaction between Sr2+ ions and variously treated animal bones was studied from the aspect of Sr-90 isotope immobilization from the contaminated effluents. As a source of biogenic, poorly-crystalline apatite, bone based materials, in general, were found to exhibit good retention properties towards Sr2+ cation. Furthermore, sorption capacities of H2O2 treated bone sample and sample annealed at 400 degrees C were found to be higher in respect to a commercial bone char and synthetic hydroxyapatite. Mentioned treatments induced partial organic phase removal from the pores of the skeletal material that caused the increase of the specific surface area. Higher temperatures provoked an increase of the apatite phase crystallinity, agglomeration of nano-crystals and a decrease of both the specific surface area and Sr2+ sorption. The immobilization was pH independent in the range 4-10, as a result of sorbents buffering properties. Kinetic data were well represented by the pseudo-second-order reaction model. Sorption isotherms were in better correlation with Freundlich than Langmuir theoretical model, whereas samples heated at 800 degrees C and 1000 degrees C showed S-type isotherms which were in a good agreement with sigmoidal Langmuir equation. The ion-exchange with Ca2+ cations and the specific cation sorption were two recognized mechanisms in the Sr2+ removal process, with relative contributions strongly dependent on the sorbents physicochemical properties. Sr2+ -loaded products were the most stable in the neutral and alkaline environments, while Ca2+ containing and acidic leaching solutions caused increased Sr2+ desorption. (C) 2010 Elsevier B.V. All rights reserved.",
journal = "Journal of Nuclear Materials",
title = "Resource recovery of animal bones: Study on sorptive properties and mechanism for Sr2+ ions",
volume = "400",
number = "1",
pages = "15-24",
doi = "10.1016/j.jnucmat.2010.02.004"
}

Smičiklas, I. D., Dimović, S., Šljivić-Ivanović, M. Z., Plećaš, I. B., Lončar, B. B.,& Mitrić, M.. (2010). Resource recovery of animal bones: Study on sorptive properties and mechanism for Sr2+ ions. in Journal of Nuclear Materials, 400(1), 15-24.
https://doi.org/10.1016/j.jnucmat.2010.02.004

Smičiklas ID, Dimović S, Šljivić-Ivanović MZ, Plećaš IB, Lončar BB, Mitrić M. Resource recovery of animal bones: Study on sorptive properties and mechanism for Sr2+ ions. in Journal of Nuclear Materials. 2010;400(1):15-24.
doi:10.1016/j.jnucmat.2010.02.004 .

Smičiklas, Ivana D., Dimović, Slavko, Šljivić-Ivanović, Marija Z., Plećaš, Ilija B., Lončar, Boris B., Mitrić, Miodrag, "Resource recovery of animal bones: Study on sorptive properties and mechanism for Sr2+ ions" in Journal of Nuclear Materials, 400, no. 1 (2010):15-24,
https://doi.org/10.1016/j.jnucmat.2010.02.004 . .

TY  - JOUR
AU  - Plećaš, Ilija B.
PY  - 2010
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4029
AB  - Transport phenomena involved in the leaching of a radioactive material from a cement composite matrix are investigated using an empirical method employing a polynomial equation. To assess the safety for disposal of radioactive waste-cement composition, the leaching of Cs-137 and Co-60, from a waste composite into a surrounding fluid has been studied. Leaching tests were carried out in accordance with a method recommended by IAEA. Determination of retardation factors, K-F and coefficients of distribution, k(d), using a simplified mathematical model for analyzing the migration of radionuclides, have been developed. Transport phenomena involved in the leaching of a radioactive material from a cement composite matrix are investigated using an empirical method employing a polynomial equation. In our experiment we have analized mechanism of Cs-137 and Co-60 leaching values during a period of 60 days. Results presented in this paper are examples of results obtained in a 25-year mortar and concrete testing project, which will influence the design of the engineered trenches system for a future central Serbian radioactive waste storage center. (C) 2010 Elsevier Ltd. All rights reserved.
T2  - Progress in Nuclear Energy
T1  - Mathematical modelling of immobilization of radionuclides Cs-137 and Co-60 in concrete matrix
VL  - 52
IS  - 7
SP  - 685
EP  - 688
DO  - 10.1016/j.pnucene.2010.03.005
ER  - 

@article{
author = "Plećaš, Ilija B.",
year = "2010",
abstract = "Transport phenomena involved in the leaching of a radioactive material from a cement composite matrix are investigated using an empirical method employing a polynomial equation. To assess the safety for disposal of radioactive waste-cement composition, the leaching of Cs-137 and Co-60, from a waste composite into a surrounding fluid has been studied. Leaching tests were carried out in accordance with a method recommended by IAEA. Determination of retardation factors, K-F and coefficients of distribution, k(d), using a simplified mathematical model for analyzing the migration of radionuclides, have been developed. Transport phenomena involved in the leaching of a radioactive material from a cement composite matrix are investigated using an empirical method employing a polynomial equation. In our experiment we have analized mechanism of Cs-137 and Co-60 leaching values during a period of 60 days. Results presented in this paper are examples of results obtained in a 25-year mortar and concrete testing project, which will influence the design of the engineered trenches system for a future central Serbian radioactive waste storage center. (C) 2010 Elsevier Ltd. All rights reserved.",
journal = "Progress in Nuclear Energy",
title = "Mathematical modelling of immobilization of radionuclides Cs-137 and Co-60 in concrete matrix",
volume = "52",
number = "7",
pages = "685-688",
doi = "10.1016/j.pnucene.2010.03.005"
}

Plećaš, I. B.. (2010). Mathematical modelling of immobilization of radionuclides Cs-137 and Co-60 in concrete matrix. in Progress in Nuclear Energy, 52(7), 685-688.
https://doi.org/10.1016/j.pnucene.2010.03.005

Plećaš IB. Mathematical modelling of immobilization of radionuclides Cs-137 and Co-60 in concrete matrix. in Progress in Nuclear Energy. 2010;52(7):685-688.
doi:10.1016/j.pnucene.2010.03.005 .

Plećaš, Ilija B., "Mathematical modelling of immobilization of radionuclides Cs-137 and Co-60 in concrete matrix" in Progress in Nuclear Energy, 52, no. 7 (2010):685-688,
https://doi.org/10.1016/j.pnucene.2010.03.005 . .

TY  - CONF
AU  - Plećaš, Ilija B.
AU  - Dimović, Slavko
PY  - 2010
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/6913
AB  - Traditional methods of processing evaporator concentrates from NPP are evaporation and cementation. These methods allow to transform a liquid radioactive waste into a more inert form, suitable for a final disposal. To assess the safety for disposal of radioactive mortar-waste composition, the leaching of (137)Cs from immobilized radioactive evaporator concentrate into a surrounding fluid has been studied. Leaching tests were carried out in accordance with a method recommended by IAEA. Curing conditions and curing time prior to commencing the leaching test are critically important in leach studies since the extent of hydration of the cement materials determines how much hydration product develops and whether it is available to block the pore network, thereby reducing leaching. Incremental leaching rates R(n)(cm/d) of (137)Cs from evaporator concentrates after 180 days were measured. The results presented in this paper are examples of results obtained in a 20-year concrete testing project which will influence the design of the engineer trenches system for future central Serbian radioactive waste storing center.
T1  - Curing Time Effect on the Fraction of (137)Cs from Immobilized Radioactive Evaporator Sludge By Cement
SP  - 369
EP  - 371
UR  - https://hdl.handle.net/21.15107/rcub_vinar_6913
ER  - 

@conference{
author = "Plećaš, Ilija B. and Dimović, Slavko",
year = "2010",
abstract = "Traditional methods of processing evaporator concentrates from NPP are evaporation and cementation. These methods allow to transform a liquid radioactive waste into a more inert form, suitable for a final disposal. To assess the safety for disposal of radioactive mortar-waste composition, the leaching of (137)Cs from immobilized radioactive evaporator concentrate into a surrounding fluid has been studied. Leaching tests were carried out in accordance with a method recommended by IAEA. Curing conditions and curing time prior to commencing the leaching test are critically important in leach studies since the extent of hydration of the cement materials determines how much hydration product develops and whether it is available to block the pore network, thereby reducing leaching. Incremental leaching rates R(n)(cm/d) of (137)Cs from evaporator concentrates after 180 days were measured. The results presented in this paper are examples of results obtained in a 20-year concrete testing project which will influence the design of the engineer trenches system for future central Serbian radioactive waste storing center.",
title = "Curing Time Effect on the Fraction of (137)Cs from Immobilized Radioactive Evaporator Sludge By Cement",
pages = "369-371",
url = "https://hdl.handle.net/21.15107/rcub_vinar_6913"
}

Plećaš, I. B.,& Dimović, S.. (2010). Curing Time Effect on the Fraction of (137)Cs from Immobilized Radioactive Evaporator Sludge By Cement. , 369-371.
https://hdl.handle.net/21.15107/rcub_vinar_6913

Plećaš IB, Dimović S. Curing Time Effect on the Fraction of (137)Cs from Immobilized Radioactive Evaporator Sludge By Cement. 2010;:369-371.
https://hdl.handle.net/21.15107/rcub_vinar_6913 .

Plećaš, Ilija B., Dimović, Slavko, "Curing Time Effect on the Fraction of (137)Cs from Immobilized Radioactive Evaporator Sludge By Cement" (2010):369-371,
https://hdl.handle.net/21.15107/rcub_vinar_6913 .

TY  - JOUR
AU  - Plećaš, Ilija B.
AU  - Dimović, Slavko
AU  - Smičiklas, Ivana D.
PY  - 2009
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3617
AB  - To assess the safety for disposal of radioactive mortar-waste composition, the leaching Of (137)Cs, (60)Co, and (85)Sr from immobilized radioactive evaporator concentrate, into a surrounding fluid has been studied. This paper also presents results from studies made to determine the influence of natural adsorbents (bentonite and zeolite) in immobilization of evaporator concentrate in cement matrix, by measuring leachability of (137)Cs, (60)Co, and (85)Sr. Leaching tests were carried out in accordance with a method recommended by IAFA during 300 days. From the leaching data the apparent diffusivity of cobalt, cesium, and strontium in the cement-bentonite matrix was measured. The uniaxial compressive strength of eleven mortar samples was determined following the ASTM standards. These results are part of a 30-year mortar and concrete testing project which will contribute to the design of radioactive waste management for a future Serbian radioactive waste disposal center. (C) 2008 Published by Elsevier B.V.
T2  - Applied Clay Science
T1  - Influence of bentonite and zeolite in cementation of dry radioactive evaporator concentrates
VL  - 43
IS  - 1
SP  - 9
EP  - 12
DO  - 10.1016/j.clay.2008.07.003
ER  - 

@article{
author = "Plećaš, Ilija B. and Dimović, Slavko and Smičiklas, Ivana D.",
year = "2009",
abstract = "To assess the safety for disposal of radioactive mortar-waste composition, the leaching Of (137)Cs, (60)Co, and (85)Sr from immobilized radioactive evaporator concentrate, into a surrounding fluid has been studied. This paper also presents results from studies made to determine the influence of natural adsorbents (bentonite and zeolite) in immobilization of evaporator concentrate in cement matrix, by measuring leachability of (137)Cs, (60)Co, and (85)Sr. Leaching tests were carried out in accordance with a method recommended by IAFA during 300 days. From the leaching data the apparent diffusivity of cobalt, cesium, and strontium in the cement-bentonite matrix was measured. The uniaxial compressive strength of eleven mortar samples was determined following the ASTM standards. These results are part of a 30-year mortar and concrete testing project which will contribute to the design of radioactive waste management for a future Serbian radioactive waste disposal center. (C) 2008 Published by Elsevier B.V.",
journal = "Applied Clay Science",
title = "Influence of bentonite and zeolite in cementation of dry radioactive evaporator concentrates",
volume = "43",
number = "1",
pages = "9-12",
doi = "10.1016/j.clay.2008.07.003"
}

Plećaš, I. B., Dimović, S.,& Smičiklas, I. D.. (2009). Influence of bentonite and zeolite in cementation of dry radioactive evaporator concentrates. in Applied Clay Science, 43(1), 9-12.
https://doi.org/10.1016/j.clay.2008.07.003

Plećaš IB, Dimović S, Smičiklas ID. Influence of bentonite and zeolite in cementation of dry radioactive evaporator concentrates. in Applied Clay Science. 2009;43(1):9-12.
doi:10.1016/j.clay.2008.07.003 .

Plećaš, Ilija B., Dimović, Slavko, Smičiklas, Ivana D., "Influence of bentonite and zeolite in cementation of dry radioactive evaporator concentrates" in Applied Clay Science, 43, no. 1 (2009):9-12,
https://doi.org/10.1016/j.clay.2008.07.003 . .

TY  - JOUR
AU  - Šljivić-Ivanović, Marija Z.
AU  - Smičiklas, Ivana D.
AU  - Pejanović, Srđan
AU  - Plećaš, Ilija B.
PY  - 2009
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3618
AB  - The adsorption of a zeolite, clay and diatomite from Serbia toward aqueous Cu2+ ions was studied, at different pH. The adsorbents were characterized with respect to phase composition, specific surface area and point of zero charge. The amounts Of Cu2+ removed from the solution, increased with increasing initial pH, reaching nearly 100% at pH GT 7, regardless of the adsorbent type and metal concentration, due to precipitation of Cu(OH)(2). Relatively constant final pH values and less significant increase Of Cu2+ uptake observed in the initial pH range 4-6 have pointed out the role of buffering properties of investigated adsorbent materials. The maximum adsorption capacities decreased in the order zeolite (0.128 mmol/g) GT clay (0.096 mmol/g) GT diatomite (0.047 mmol/g). The Langmuir equation was most suitable for data fitting. The proportion Of Cu2+ desorbed in acidic media decreased with the increase of previously adsorbed amounts by zeolite and clay, while the opposite was true for diatomite. Ion exchange of exchangeable cations and protons were identified as main adsorption mechanisms, with latter being most apparent in the removal mechanism of diatomite. Considering low-cost, local availability and environmentally friendly materials, zeolite exhibited highest potential for environmental and health protection applications. (C) 2008 Elsevier B.V. All rights reserved.
T2  - Applied Clay Science
T1  - Comparative study of cu(2+) adsorption on a zeolite, a clay and a diatomite from Serbia
VL  - 43
IS  - 1
SP  - 33
EP  - 40
DO  - 10.1016/j.clay.2008.07.009
ER  - 

@article{
author = "Šljivić-Ivanović, Marija Z. and Smičiklas, Ivana D. and Pejanović, Srđan and Plećaš, Ilija B.",
year = "2009",
abstract = "The adsorption of a zeolite, clay and diatomite from Serbia toward aqueous Cu2+ ions was studied, at different pH. The adsorbents were characterized with respect to phase composition, specific surface area and point of zero charge. The amounts Of Cu2+ removed from the solution, increased with increasing initial pH, reaching nearly 100% at pH GT 7, regardless of the adsorbent type and metal concentration, due to precipitation of Cu(OH)(2). Relatively constant final pH values and less significant increase Of Cu2+ uptake observed in the initial pH range 4-6 have pointed out the role of buffering properties of investigated adsorbent materials. The maximum adsorption capacities decreased in the order zeolite (0.128 mmol/g) GT clay (0.096 mmol/g) GT diatomite (0.047 mmol/g). The Langmuir equation was most suitable for data fitting. The proportion Of Cu2+ desorbed in acidic media decreased with the increase of previously adsorbed amounts by zeolite and clay, while the opposite was true for diatomite. Ion exchange of exchangeable cations and protons were identified as main adsorption mechanisms, with latter being most apparent in the removal mechanism of diatomite. Considering low-cost, local availability and environmentally friendly materials, zeolite exhibited highest potential for environmental and health protection applications. (C) 2008 Elsevier B.V. All rights reserved.",
journal = "Applied Clay Science",
title = "Comparative study of cu(2+) adsorption on a zeolite, a clay and a diatomite from Serbia",
volume = "43",
number = "1",
pages = "33-40",
doi = "10.1016/j.clay.2008.07.009"
}

Šljivić-Ivanović, M. Z., Smičiklas, I. D., Pejanović, S.,& Plećaš, I. B.. (2009). Comparative study of cu(2+) adsorption on a zeolite, a clay and a diatomite from Serbia. in Applied Clay Science, 43(1), 33-40.
https://doi.org/10.1016/j.clay.2008.07.009

Šljivić-Ivanović MZ, Smičiklas ID, Pejanović S, Plećaš IB. Comparative study of cu(2+) adsorption on a zeolite, a clay and a diatomite from Serbia. in Applied Clay Science. 2009;43(1):33-40.
doi:10.1016/j.clay.2008.07.009 .

Šljivić-Ivanović, Marija Z., Smičiklas, Ivana D., Pejanović, Srđan, Plećaš, Ilija B., "Comparative study of cu(2+) adsorption on a zeolite, a clay and a diatomite from Serbia" in Applied Clay Science, 43, no. 1 (2009):33-40,
https://doi.org/10.1016/j.clay.2008.07.009 . .

TY  - JOUR
AU  - Dimović, Slavko
AU  - Smičiklas, Ivana D.
AU  - Plećaš, Ilija B.
AU  - Antonović, Dušan
PY  - 2009
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3631
AB  - The effect of particle size, bone char mass, initial pH, and metal concentration on the kinetics of Sr2+ sorption by bone char was studied and discussed. Considering the sorbed amounts of Sr2+, solution pH changes, changes of Ca2+ concentrations and Ca/Sr molar ratios, with time, it was concluded that surface complexation reactions are dominant in the first, more rapid stage of the sorption process, while the contribution of the ion-exchange mechanism increases with time and becomes more significant in the second, slower phase. Under all investigated experimental conditions, the pseudo-second-order model was found to provide high correlation coefficients and the equilibrium amounts of Sr2+ sorbed comparable to the values obtained experimentally.
T2  - Separation Science and Technology
T1  - Kinetic Study of Sr2+Sorption by Bone Char
VL  - 44
IS  - 3
SP  - 645
EP  - 667
DO  - 10.1080/01496390802634307
ER  - 

@article{
author = "Dimović, Slavko and Smičiklas, Ivana D. and Plećaš, Ilija B. and Antonović, Dušan",
year = "2009",
abstract = "The effect of particle size, bone char mass, initial pH, and metal concentration on the kinetics of Sr2+ sorption by bone char was studied and discussed. Considering the sorbed amounts of Sr2+, solution pH changes, changes of Ca2+ concentrations and Ca/Sr molar ratios, with time, it was concluded that surface complexation reactions are dominant in the first, more rapid stage of the sorption process, while the contribution of the ion-exchange mechanism increases with time and becomes more significant in the second, slower phase. Under all investigated experimental conditions, the pseudo-second-order model was found to provide high correlation coefficients and the equilibrium amounts of Sr2+ sorbed comparable to the values obtained experimentally.",
journal = "Separation Science and Technology",
title = "Kinetic Study of Sr2+Sorption by Bone Char",
volume = "44",
number = "3",
pages = "645-667",
doi = "10.1080/01496390802634307"
}

Dimović, S., Smičiklas, I. D., Plećaš, I. B.,& Antonović, D.. (2009). Kinetic Study of Sr2+Sorption by Bone Char. in Separation Science and Technology, 44(3), 645-667.
https://doi.org/10.1080/01496390802634307

Dimović S, Smičiklas ID, Plećaš IB, Antonović D. Kinetic Study of Sr2+Sorption by Bone Char. in Separation Science and Technology. 2009;44(3):645-667.
doi:10.1080/01496390802634307 .

Dimović, Slavko, Smičiklas, Ivana D., Plećaš, Ilija B., Antonović, Dušan, "Kinetic Study of Sr2+Sorption by Bone Char" in Separation Science and Technology, 44, no. 3 (2009):645-667,
https://doi.org/10.1080/01496390802634307 . .

TY  - JOUR
AU  - Dimović, Slavko
AU  - Smičiklas, Ivana D.
AU  - Plećaš, Ilija B.
AU  - Antonović, Dušan
AU  - Mitrić, Miodrag
PY  - 2009
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3663
AB  - The objective of the present study was the evaluation of differently treated bovine bones for Co2+ removal from aqueous media. Powdered bones (B), as well as samples prepared by H2O2 oxidation (BH2O2) and annealing at 400-1000 degrees C (B400-B1000), were tested as sorbent materials. A combination of XRD, FTIR spectroscopies, DTA/TGA analyses, specific surface area (S-p) and point of zero charge (pH(PZC)) measurements was utilized for physicochemical characterization of sorbents. Sorption of Co2+ was studied in batch conditions as a function of pH, contact time and Co2+ concentration. Initial pH values in the range4-8 were found optimal for sorption experiments. Equilibrium time of 24 h was required in all investigated systems. The maximum sorption capacities differ significantly from 0.078 to 0.495 mmol/g, whereas the affinity towards Co2+ decreased in the order: B400 GT BH2O2 GT B600 GT B GT B800 GT B1000. The pseudo-second-order model and Langmuir theoretical equation were used for fitting the kinetic and equilibrium data, respectively. Ion-exchange with Ca2+ and specific cation sorption were identified as main removal mechanisms. The amounts of Co2+ desorbed from loaded bone sorbents increased with the decrease of pH as well as with the increase of Ca2+ concentration. Heating at 400 degrees C was found to be an optimal treatment for the production of the Co2+ removal agent. (C) 2008 Elsevier B.V. All rights reserved.
T2  - Journal of Hazardous Materials
T1  - Comparative study of differently treated animal bones for Co2+ removal
VL  - 164
IS  - 1
SP  - 279
EP  - 287
DO  - 10.1016/j.jhazmat.2008.08.013
ER  - 

@article{
author = "Dimović, Slavko and Smičiklas, Ivana D. and Plećaš, Ilija B. and Antonović, Dušan and Mitrić, Miodrag",
year = "2009",
abstract = "The objective of the present study was the evaluation of differently treated bovine bones for Co2+ removal from aqueous media. Powdered bones (B), as well as samples prepared by H2O2 oxidation (BH2O2) and annealing at 400-1000 degrees C (B400-B1000), were tested as sorbent materials. A combination of XRD, FTIR spectroscopies, DTA/TGA analyses, specific surface area (S-p) and point of zero charge (pH(PZC)) measurements was utilized for physicochemical characterization of sorbents. Sorption of Co2+ was studied in batch conditions as a function of pH, contact time and Co2+ concentration. Initial pH values in the range4-8 were found optimal for sorption experiments. Equilibrium time of 24 h was required in all investigated systems. The maximum sorption capacities differ significantly from 0.078 to 0.495 mmol/g, whereas the affinity towards Co2+ decreased in the order: B400 GT BH2O2 GT B600 GT B GT B800 GT B1000. The pseudo-second-order model and Langmuir theoretical equation were used for fitting the kinetic and equilibrium data, respectively. Ion-exchange with Ca2+ and specific cation sorption were identified as main removal mechanisms. The amounts of Co2+ desorbed from loaded bone sorbents increased with the decrease of pH as well as with the increase of Ca2+ concentration. Heating at 400 degrees C was found to be an optimal treatment for the production of the Co2+ removal agent. (C) 2008 Elsevier B.V. All rights reserved.",
journal = "Journal of Hazardous Materials",
title = "Comparative study of differently treated animal bones for Co2+ removal",
volume = "164",
number = "1",
pages = "279-287",
doi = "10.1016/j.jhazmat.2008.08.013"
}

Dimović, S., Smičiklas, I. D., Plećaš, I. B., Antonović, D.,& Mitrić, M.. (2009). Comparative study of differently treated animal bones for Co2+ removal. in Journal of Hazardous Materials, 164(1), 279-287.
https://doi.org/10.1016/j.jhazmat.2008.08.013

Dimović S, Smičiklas ID, Plećaš IB, Antonović D, Mitrić M. Comparative study of differently treated animal bones for Co2+ removal. in Journal of Hazardous Materials. 2009;164(1):279-287.
doi:10.1016/j.jhazmat.2008.08.013 .

Dimović, Slavko, Smičiklas, Ivana D., Plećaš, Ilija B., Antonović, Dušan, Mitrić, Miodrag, "Comparative study of differently treated animal bones for Co2+ removal" in Journal of Hazardous Materials, 164, no. 1 (2009):279-287,
https://doi.org/10.1016/j.jhazmat.2008.08.013 . .

TY  - JOUR
AU  - Šljivić-Ivanović, Marija Z.
AU  - Smičiklas, Ivana D.
AU  - Plećaš, Ilija B.
AU  - Mitrić, Miodrag
PY  - 2009
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3664
AB  - The influence of equilibration conditions and hydroxyapatite (HAP) physico-chemical properties onto retention of Cu2+ ions was studied in batch conditions. The amount of cation removed from the solution increased with increasing pH, reaching almost 100% at pH 3. 4 and 7 for 5 x 10(-4), 10(-3) and 5 x 10(-3) mol/dm(3) solutions. respectively. Contact time necessary for reaching equilibrium was found to increase with the increase of Cu2+ concentration. Kinetic and equilibrium data were best described by pseudo-second-order kinetic model and Langmuir theoretical model. The calculated values of separation factors and Gibbs free energy change confirmed that the sorption was spontaneous and thermodynamically feasible at room temperature. The experiments conducted using HAP samples with different physico-chemical characteristics have revealed that the amounts of sorbed Cu2+ depended mainly on the specific surface area and crystallinity of the applied powders. Desorption of Cu2+ was more efficient in acidic conditions than in the Solution of competing cation-Ca2+. The samples with higher sorption capacities also demonstrated higher stability; consequently, from the aspects of both higher sorption and lower desorption, utilization of low-crystalline HAP samples with high specific surface area was superior for immobilization of Cu2+ ions. Taking into account molar Cu/Ca ratios. observed final pH changes, copper speciation in the function of pH and the results of X-ray diffraction analyses, conclusions about sorption mechanisms at different experimental conditions were derived. (C) 2008 Elsevier B.V. All rights reserved.
T2  - Chemical Engineering Journal
T1  - The influence of equilibration conditions and hydroxyapatite physico-chemical properties onto retention of Cu2+ ions
VL  - 148
IS  - 1
SP  - 80
EP  - 88
DO  - 10.1016/j.cej.2008.08.003
ER  - 

@article{
author = "Šljivić-Ivanović, Marija Z. and Smičiklas, Ivana D. and Plećaš, Ilija B. and Mitrić, Miodrag",
year = "2009",
abstract = "The influence of equilibration conditions and hydroxyapatite (HAP) physico-chemical properties onto retention of Cu2+ ions was studied in batch conditions. The amount of cation removed from the solution increased with increasing pH, reaching almost 100% at pH 3. 4 and 7 for 5 x 10(-4), 10(-3) and 5 x 10(-3) mol/dm(3) solutions. respectively. Contact time necessary for reaching equilibrium was found to increase with the increase of Cu2+ concentration. Kinetic and equilibrium data were best described by pseudo-second-order kinetic model and Langmuir theoretical model. The calculated values of separation factors and Gibbs free energy change confirmed that the sorption was spontaneous and thermodynamically feasible at room temperature. The experiments conducted using HAP samples with different physico-chemical characteristics have revealed that the amounts of sorbed Cu2+ depended mainly on the specific surface area and crystallinity of the applied powders. Desorption of Cu2+ was more efficient in acidic conditions than in the Solution of competing cation-Ca2+. The samples with higher sorption capacities also demonstrated higher stability; consequently, from the aspects of both higher sorption and lower desorption, utilization of low-crystalline HAP samples with high specific surface area was superior for immobilization of Cu2+ ions. Taking into account molar Cu/Ca ratios. observed final pH changes, copper speciation in the function of pH and the results of X-ray diffraction analyses, conclusions about sorption mechanisms at different experimental conditions were derived. (C) 2008 Elsevier B.V. All rights reserved.",
journal = "Chemical Engineering Journal",
title = "The influence of equilibration conditions and hydroxyapatite physico-chemical properties onto retention of Cu2+ ions",
volume = "148",
number = "1",
pages = "80-88",
doi = "10.1016/j.cej.2008.08.003"
}

Šljivić-Ivanović, M. Z., Smičiklas, I. D., Plećaš, I. B.,& Mitrić, M.. (2009). The influence of equilibration conditions and hydroxyapatite physico-chemical properties onto retention of Cu2+ ions. in Chemical Engineering Journal, 148(1), 80-88.
https://doi.org/10.1016/j.cej.2008.08.003

Šljivić-Ivanović MZ, Smičiklas ID, Plećaš IB, Mitrić M. The influence of equilibration conditions and hydroxyapatite physico-chemical properties onto retention of Cu2+ ions. in Chemical Engineering Journal. 2009;148(1):80-88.
doi:10.1016/j.cej.2008.08.003 .

Šljivić-Ivanović, Marija Z., Smičiklas, Ivana D., Plećaš, Ilija B., Mitrić, Miodrag, "The influence of equilibration conditions and hydroxyapatite physico-chemical properties onto retention of Cu2+ ions" in Chemical Engineering Journal, 148, no. 1 (2009):80-88,
https://doi.org/10.1016/j.cej.2008.08.003 . .

TY  - CONF
AU  - Plećaš, Ilija B.
AU  - Dimović, Slavko
PY  - 2009
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/6809
AB  - To assess the safety of disposal of radioactive waste material in cement, curing conditions and time of leaching radionuclides (137)Cs have been studied. Leaching tests in cement-ion exchange resins-bentonite matrix, were carried out in accordance with a method recommended by IAEA. Curing conditions and curing time prior to commencing the leaching test are critically important in leach studies since the extent of hydration of the cement materials determines how much hydration product develops and whether it is available to block the pore network, thereby reducing leaching. Incremental leaching rates R(n)(cm/d) of (137)CS from cement-ion exchange resins-bentonite matrix after 180 days were measured. The results presented in this paper are examples of results obtained in a 20-year concrete testing project which will. influence the design of the engineer trenches system for future central Serbian radioactive waste storing center.
T1  - Curing Time Effect on the Fraction of (137)Cs from Cement-Ion Exchange Resins-Bentonite Clay Composition
SP  - 455
EP  - 457
UR  - https://hdl.handle.net/21.15107/rcub_vinar_6809
ER  - 

@conference{
author = "Plećaš, Ilija B. and Dimović, Slavko",
year = "2009",
abstract = "To assess the safety of disposal of radioactive waste material in cement, curing conditions and time of leaching radionuclides (137)Cs have been studied. Leaching tests in cement-ion exchange resins-bentonite matrix, were carried out in accordance with a method recommended by IAEA. Curing conditions and curing time prior to commencing the leaching test are critically important in leach studies since the extent of hydration of the cement materials determines how much hydration product develops and whether it is available to block the pore network, thereby reducing leaching. Incremental leaching rates R(n)(cm/d) of (137)CS from cement-ion exchange resins-bentonite matrix after 180 days were measured. The results presented in this paper are examples of results obtained in a 20-year concrete testing project which will. influence the design of the engineer trenches system for future central Serbian radioactive waste storing center.",
title = "Curing Time Effect on the Fraction of (137)Cs from Cement-Ion Exchange Resins-Bentonite Clay Composition",
pages = "455-457",
url = "https://hdl.handle.net/21.15107/rcub_vinar_6809"
}

Plećaš, I. B.,& Dimović, S.. (2009). Curing Time Effect on the Fraction of (137)Cs from Cement-Ion Exchange Resins-Bentonite Clay Composition. , 455-457.
https://hdl.handle.net/21.15107/rcub_vinar_6809

Plećaš IB, Dimović S. Curing Time Effect on the Fraction of (137)Cs from Cement-Ion Exchange Resins-Bentonite Clay Composition. 2009;:455-457.
https://hdl.handle.net/21.15107/rcub_vinar_6809 .

Plećaš, Ilija B., Dimović, Slavko, "Curing Time Effect on the Fraction of (137)Cs from Cement-Ion Exchange Resins-Bentonite Clay Composition" (2009):455-457,
https://hdl.handle.net/21.15107/rcub_vinar_6809 .

TY  - CONF
AU  - Šljivić, Marija Z.
AU  - Smičiklas, Ivana D.
AU  - Pejanović, Srđan
AU  - Plećaš, Ilija B.
PY  - 2008
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9392
AB  - The Cu2+ sorption onto HAP was investigated as a function of time, in the concentration range 5·10-4 - 5·10-3 mol/dm3. The experimentally obtained kinetic data were fitted with the intraparticle diffusion model. The correlation coefficients were low considering the overall reaction period. However, q versus t0.5 plots could be divided into three segments, out of which the second linear segment can be attributed to the intraparticle diffusion. Intraparticle diffusion rate constants (ki) increased from 3.57·10-3 to 7.80·10-3 mmol/g min0.5 with the increase of the initial Cu2+ concentration. As the lines did not pass through the origin it was concluded that intrapaticle diffusion is not the only rate-controlling step.
PB  - Society of Physical Chemists of Serbia
C3  - Physical chemistry 2008 : 9th international conference on fundamental and applied aspects of physical chemistry
T1  - The role of intraparticle diffusion in the sorption of Cu2+ ions onto hydroxyapatite
VL  - 2
SP  - 547
EP  - 549
UR  - https://hdl.handle.net/21.15107/rcub_vinar_9392
ER  - 

@conference{
author = "Šljivić, Marija Z. and Smičiklas, Ivana D. and Pejanović, Srđan and Plećaš, Ilija B.",
year = "2008",
abstract = "The Cu2+ sorption onto HAP was investigated as a function of time, in the concentration range 5·10-4 - 5·10-3 mol/dm3. The experimentally obtained kinetic data were fitted with the intraparticle diffusion model. The correlation coefficients were low considering the overall reaction period. However, q versus t0.5 plots could be divided into three segments, out of which the second linear segment can be attributed to the intraparticle diffusion. Intraparticle diffusion rate constants (ki) increased from 3.57·10-3 to 7.80·10-3 mmol/g min0.5 with the increase of the initial Cu2+ concentration. As the lines did not pass through the origin it was concluded that intrapaticle diffusion is not the only rate-controlling step.",
publisher = "Society of Physical Chemists of Serbia",
journal = "Physical chemistry 2008 : 9th international conference on fundamental and applied aspects of physical chemistry",
title = "The role of intraparticle diffusion in the sorption of Cu2+ ions onto hydroxyapatite",
volume = "2",
pages = "547-549",
url = "https://hdl.handle.net/21.15107/rcub_vinar_9392"
}

Šljivić, M. Z., Smičiklas, I. D., Pejanović, S.,& Plećaš, I. B.. (2008). The role of intraparticle diffusion in the sorption of Cu2+ ions onto hydroxyapatite. in Physical chemistry 2008 : 9th international conference on fundamental and applied aspects of physical chemistry
Society of Physical Chemists of Serbia., 2, 547-549.
https://hdl.handle.net/21.15107/rcub_vinar_9392

Šljivić MZ, Smičiklas ID, Pejanović S, Plećaš IB. The role of intraparticle diffusion in the sorption of Cu2+ ions onto hydroxyapatite. in Physical chemistry 2008 : 9th international conference on fundamental and applied aspects of physical chemistry. 2008;2:547-549.
https://hdl.handle.net/21.15107/rcub_vinar_9392 .

Šljivić, Marija Z., Smičiklas, Ivana D., Pejanović, Srđan, Plećaš, Ilija B., "The role of intraparticle diffusion in the sorption of Cu2+ ions onto hydroxyapatite" in Physical chemistry 2008 : 9th international conference on fundamental and applied aspects of physical chemistry, 2 (2008):547-549,
https://hdl.handle.net/21.15107/rcub_vinar_9392 .

TY  - CONF
AU  - Smičiklas, Ivana D.
AU  - Dimović, Slavko
AU  - Šljivić, Marija Z.
AU  - Plećaš, Ilija B.
PY  - 2008
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9393
AB  - The sorption properties of clinoptilolite and hydroxyapatite towards Cs1+, Co2+, and Sr2+ ions were compared, under the same experimental conditions. Cs1+ was preferably sorbed by natural clinoptilolite. Conversely, synthetic hydroxyapatite exhibited higher sorption capacities for Co2+ and Sr2+, while the sorption of Cs1+ was negligible. It was shown that, as a consequence of different affinity towards investigated cations, application of mixed clinoptilolite/hydroxyapatite sorbent represents a good strategy for the purification of effluents containing a mixture of Cs1+, Co2+ and Sr2+.
PB  - Society of Physical Chemists of Serbia
C3  - Physical chemistry 2008 : 9th international conference on fundamental and applied aspects of physical chemistry
T1  - The evaluation of radionuclides removal using clinoptilolite, hydroxyapatite and their mixtures
VL  - 2
SP  - 550
EP  - 552
UR  - https://hdl.handle.net/21.15107/rcub_vinar_9393
ER  - 

@conference{
author = "Smičiklas, Ivana D. and Dimović, Slavko and Šljivić, Marija Z. and Plećaš, Ilija B.",
year = "2008",
abstract = "The sorption properties of clinoptilolite and hydroxyapatite towards Cs1+, Co2+, and Sr2+ ions were compared, under the same experimental conditions. Cs1+ was preferably sorbed by natural clinoptilolite. Conversely, synthetic hydroxyapatite exhibited higher sorption capacities for Co2+ and Sr2+, while the sorption of Cs1+ was negligible. It was shown that, as a consequence of different affinity towards investigated cations, application of mixed clinoptilolite/hydroxyapatite sorbent represents a good strategy for the purification of effluents containing a mixture of Cs1+, Co2+ and Sr2+.",
publisher = "Society of Physical Chemists of Serbia",
journal = "Physical chemistry 2008 : 9th international conference on fundamental and applied aspects of physical chemistry",
title = "The evaluation of radionuclides removal using clinoptilolite, hydroxyapatite and their mixtures",
volume = "2",
pages = "550-552",
url = "https://hdl.handle.net/21.15107/rcub_vinar_9393"
}

Smičiklas, I. D., Dimović, S., Šljivić, M. Z.,& Plećaš, I. B.. (2008). The evaluation of radionuclides removal using clinoptilolite, hydroxyapatite and their mixtures. in Physical chemistry 2008 : 9th international conference on fundamental and applied aspects of physical chemistry
Society of Physical Chemists of Serbia., 2, 550-552.
https://hdl.handle.net/21.15107/rcub_vinar_9393

Smičiklas ID, Dimović S, Šljivić MZ, Plećaš IB. The evaluation of radionuclides removal using clinoptilolite, hydroxyapatite and their mixtures. in Physical chemistry 2008 : 9th international conference on fundamental and applied aspects of physical chemistry. 2008;2:550-552.
https://hdl.handle.net/21.15107/rcub_vinar_9393 .

Smičiklas, Ivana D., Dimović, Slavko, Šljivić, Marija Z., Plećaš, Ilija B., "The evaluation of radionuclides removal using clinoptilolite, hydroxyapatite and their mixtures" in Physical chemistry 2008 : 9th international conference on fundamental and applied aspects of physical chemistry, 2 (2008):550-552,
https://hdl.handle.net/21.15107/rcub_vinar_9393 .

TY  - JOUR
AU  - Smičiklas, Ivana D.
AU  - Dimović, Slavko
AU  - Šljivić-Ivanović, Marija Z.
AU  - Plećaš, Ilija B.
PY  - 2008
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3343
AB  - Considering the excellent sorption properties of synthetic calcium hydroxyapatite (HAP) towards many divalent cations, the potential application of bone char, the natural source of HAP, for sequestering Sr(2+)ions from aqueous solutions has been studied in batch conditions. Contact time, initial solution pH and initial Sr2+ concentrations were varied to examine the effect of these process parameters on the amount of Sr2+ sorbed. The kinetics of Sr2+ sorption was found to be a 2-step process, with contact time of 24 h required for attaining equilibrium. The sorption isotherm was well fitted with Langmuir and DKR theoretical models. Sorption of Sr2+ on bone char was found to be a favorable, thermodynamically feasible and spontaneous process, with the maximum sorption capacity of 0.271 mmol/g and sorption energy of 11.09 kJ/mol. The sorption was pH-independent in the initial pH range 4-10, as a result of excellent buffering properties of bone char (constant final pH), while for pH GT 10 sorbed amounts of Sr2+ increased due to attractive electrostatic forces between negatively charged sorbent surface and positively charged metal ions. On the basis of the amount of Ca2+ released and final pH decrease in respect to the point of zero charge of bone char (pHPZC), two possible mechanisms of Sr2+ sorption were identified: ion-exchange and the formation of complex compounds with HAP and carbon active surface sites. The amounts of Sr2+ leached from bone char increased with the increase of Ca2+ content and the decrease of solution pH. In comparison with synthetic HAP, bone char represents a cost-effective alternative for Sr2+ sequestering.
T2  - Journal of Environmental Science and Health. Part A: Toxic Hazardous Substances and Environmental Engineering
T1  - The batch study of Sr2+ sorption by bone char
VL  - 43
IS  - 2
SP  - 210
EP  - 217
DO  - 10.1080/10934520701781624
ER  - 

@article{
author = "Smičiklas, Ivana D. and Dimović, Slavko and Šljivić-Ivanović, Marija Z. and Plećaš, Ilija B.",
year = "2008",
abstract = "Considering the excellent sorption properties of synthetic calcium hydroxyapatite (HAP) towards many divalent cations, the potential application of bone char, the natural source of HAP, for sequestering Sr(2+)ions from aqueous solutions has been studied in batch conditions. Contact time, initial solution pH and initial Sr2+ concentrations were varied to examine the effect of these process parameters on the amount of Sr2+ sorbed. The kinetics of Sr2+ sorption was found to be a 2-step process, with contact time of 24 h required for attaining equilibrium. The sorption isotherm was well fitted with Langmuir and DKR theoretical models. Sorption of Sr2+ on bone char was found to be a favorable, thermodynamically feasible and spontaneous process, with the maximum sorption capacity of 0.271 mmol/g and sorption energy of 11.09 kJ/mol. The sorption was pH-independent in the initial pH range 4-10, as a result of excellent buffering properties of bone char (constant final pH), while for pH GT 10 sorbed amounts of Sr2+ increased due to attractive electrostatic forces between negatively charged sorbent surface and positively charged metal ions. On the basis of the amount of Ca2+ released and final pH decrease in respect to the point of zero charge of bone char (pHPZC), two possible mechanisms of Sr2+ sorption were identified: ion-exchange and the formation of complex compounds with HAP and carbon active surface sites. The amounts of Sr2+ leached from bone char increased with the increase of Ca2+ content and the decrease of solution pH. In comparison with synthetic HAP, bone char represents a cost-effective alternative for Sr2+ sequestering.",
journal = "Journal of Environmental Science and Health. Part A: Toxic Hazardous Substances and Environmental Engineering",
title = "The batch study of Sr2+ sorption by bone char",
volume = "43",
number = "2",
pages = "210-217",
doi = "10.1080/10934520701781624"
}

Smičiklas, I. D., Dimović, S., Šljivić-Ivanović, M. Z.,& Plećaš, I. B.. (2008). The batch study of Sr2+ sorption by bone char. in Journal of Environmental Science and Health. Part A: Toxic Hazardous Substances and Environmental Engineering, 43(2), 210-217.
https://doi.org/10.1080/10934520701781624

Smičiklas ID, Dimović S, Šljivić-Ivanović MZ, Plećaš IB. The batch study of Sr2+ sorption by bone char. in Journal of Environmental Science and Health. Part A: Toxic Hazardous Substances and Environmental Engineering. 2008;43(2):210-217.
doi:10.1080/10934520701781624 .

Smičiklas, Ivana D., Dimović, Slavko, Šljivić-Ivanović, Marija Z., Plećaš, Ilija B., "The batch study of Sr2+ sorption by bone char" in Journal of Environmental Science and Health. Part A: Toxic Hazardous Substances and Environmental Engineering, 43, no. 2 (2008):210-217,
https://doi.org/10.1080/10934520701781624 . .

TY  - JOUR
AU  - Smičiklas, Ivana D.
AU  - Dimović, Slavko
AU  - Plećaš, Ilija B.
PY  - 2007
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3149
AB  - The adsorption properties of local clinoptilolite (Serbia) towards Cs+, Co2+, and Sr2+ were investigated by batch equilibration technique. The influence of equilibration time, initial metal cation concentration, solution PH and presence of EDTA on these properties was studied and discussed. Kinetic data were found to be well fitted with pseudo-second order kinetic model. Cs+ is preferably adsorbed by the natural clinoptilolite, followed by Sr2+ and CO2+. The Langmuir adsorption isotherm was used to determine the adsorption capacities from both single and mixed metal solutions. At PH range of 3-12 the adsorption of Cs+ remains almost constant, while at low PH (2-3) the adsorption is lesser. At initial PH range of 2-10 adsorption of Sr2+ remains approximately stable, whereas at initial PH GT 10 adsorption increases significantly. The adsorption of Co2+ is low at low PH but increased remarkably with increasing PH and precipitated at pH GT 8. Cs+ adsorption on the clinoptitolite was not affected by the presence of EDTA, while the presence of EDTA hinders the adsorption of Co2+ and Sr-2+ on clinoptilolite. (c) 2006 Elsevier B.V. All rights reserved.
T2  - Applied Clay Science
T1  - Removal of Cs1+, Sr2+ and Co2+ from aqueous solutions by adsorption on natural clinoptilolite
VL  - 35
IS  - 1-2
SP  - 139
EP  - 144
DO  - 10.1016/j.clay.2006.08.004
ER  - 

@article{
author = "Smičiklas, Ivana D. and Dimović, Slavko and Plećaš, Ilija B.",
year = "2007",
abstract = "The adsorption properties of local clinoptilolite (Serbia) towards Cs+, Co2+, and Sr2+ were investigated by batch equilibration technique. The influence of equilibration time, initial metal cation concentration, solution PH and presence of EDTA on these properties was studied and discussed. Kinetic data were found to be well fitted with pseudo-second order kinetic model. Cs+ is preferably adsorbed by the natural clinoptilolite, followed by Sr2+ and CO2+. The Langmuir adsorption isotherm was used to determine the adsorption capacities from both single and mixed metal solutions. At PH range of 3-12 the adsorption of Cs+ remains almost constant, while at low PH (2-3) the adsorption is lesser. At initial PH range of 2-10 adsorption of Sr2+ remains approximately stable, whereas at initial PH GT 10 adsorption increases significantly. The adsorption of Co2+ is low at low PH but increased remarkably with increasing PH and precipitated at pH GT 8. Cs+ adsorption on the clinoptitolite was not affected by the presence of EDTA, while the presence of EDTA hinders the adsorption of Co2+ and Sr-2+ on clinoptilolite. (c) 2006 Elsevier B.V. All rights reserved.",
journal = "Applied Clay Science",
title = "Removal of Cs1+, Sr2+ and Co2+ from aqueous solutions by adsorption on natural clinoptilolite",
volume = "35",
number = "1-2",
pages = "139-144",
doi = "10.1016/j.clay.2006.08.004"
}

Smičiklas, I. D., Dimović, S.,& Plećaš, I. B.. (2007). Removal of Cs1+, Sr2+ and Co2+ from aqueous solutions by adsorption on natural clinoptilolite. in Applied Clay Science, 35(1-2), 139-144.
https://doi.org/10.1016/j.clay.2006.08.004

Smičiklas ID, Dimović S, Plećaš IB. Removal of Cs1+, Sr2+ and Co2+ from aqueous solutions by adsorption on natural clinoptilolite. in Applied Clay Science. 2007;35(1-2):139-144.
doi:10.1016/j.clay.2006.08.004 .

Smičiklas, Ivana D., Dimović, Slavko, Plećaš, Ilija B., "Removal of Cs1+, Sr2+ and Co2+ from aqueous solutions by adsorption on natural clinoptilolite" in Applied Clay Science, 35, no. 1-2 (2007):139-144,
https://doi.org/10.1016/j.clay.2006.08.004 . .