TY  - JOUR
AU  - Kragović, Milan M.
AU  - Stojmenović, Marija
AU  - Ristić, Nenad
AU  - Milićević, Sonja
AU  - Živković, Sanja
AU  - Liu, Shanke
AU  - Gulicovski, Jelena
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10414
AB  - Solving problems with hazardous waste materials is of crucial importance today. In the presented study, the application of waste vitreous enamel as a cement replacement up to 30% in mortar and concrete production was investigated. The chemical and physical-chemical characterization of the starting material was performed, as well as a leaching test and physical-mechanical characterization of mortar and concrete mixes. Obtained results showed that, due to its chemical composition, the vitreous enamel used must be classified as hazardous waste. At the same time, it possesses pozzolanic properties and satisfies minimal criteria for use as a cement replacement. Testing mortars and concrete mixes indicate that waste vitreous enamel can be applied as a construction material for cement replacement in the maximal amount of 20%. The leaching test was performed in accordance with international standard EN 12457-2 on hardened mortar with a maximal cement replacement of 20%. The results showed that there was no significant release of toxic elements, i.e., that the practical application of hazardous waste vitreous enamel in the construction industry may be fully in line with environmental standards.
T2  - Buildings
T1  - Application of the Hazardous Waste Vitreous Enamel Generated in the Production Process of Heating Devices as a Partial Replacement for Cement
VL  - 12
IS  - 8
SP  - 1287
DO  - 10.3390/buildings12081287
ER  - 

@article{
author = "Kragović, Milan M. and Stojmenović, Marija and Ristić, Nenad and Milićević, Sonja and Živković, Sanja and Liu, Shanke and Gulicovski, Jelena",
year = "2022",
abstract = "Solving problems with hazardous waste materials is of crucial importance today. In the presented study, the application of waste vitreous enamel as a cement replacement up to 30% in mortar and concrete production was investigated. The chemical and physical-chemical characterization of the starting material was performed, as well as a leaching test and physical-mechanical characterization of mortar and concrete mixes. Obtained results showed that, due to its chemical composition, the vitreous enamel used must be classified as hazardous waste. At the same time, it possesses pozzolanic properties and satisfies minimal criteria for use as a cement replacement. Testing mortars and concrete mixes indicate that waste vitreous enamel can be applied as a construction material for cement replacement in the maximal amount of 20%. The leaching test was performed in accordance with international standard EN 12457-2 on hardened mortar with a maximal cement replacement of 20%. The results showed that there was no significant release of toxic elements, i.e., that the practical application of hazardous waste vitreous enamel in the construction industry may be fully in line with environmental standards.",
journal = "Buildings",
title = "Application of the Hazardous Waste Vitreous Enamel Generated in the Production Process of Heating Devices as a Partial Replacement for Cement",
volume = "12",
number = "8",
pages = "1287",
doi = "10.3390/buildings12081287"
}

Kragović, M. M., Stojmenović, M., Ristić, N., Milićević, S., Živković, S., Liu, S.,& Gulicovski, J.. (2022). Application of the Hazardous Waste Vitreous Enamel Generated in the Production Process of Heating Devices as a Partial Replacement for Cement. in Buildings, 12(8), 1287.
https://doi.org/10.3390/buildings12081287

Kragović MM, Stojmenović M, Ristić N, Milićević S, Živković S, Liu S, Gulicovski J. Application of the Hazardous Waste Vitreous Enamel Generated in the Production Process of Heating Devices as a Partial Replacement for Cement. in Buildings. 2022;12(8):1287.
doi:10.3390/buildings12081287 .

Kragović, Milan M., Stojmenović, Marija, Ristić, Nenad, Milićević, Sonja, Živković, Sanja, Liu, Shanke, Gulicovski, Jelena, "Application of the Hazardous Waste Vitreous Enamel Generated in the Production Process of Heating Devices as a Partial Replacement for Cement" in Buildings, 12, no. 8 (2022):1287,
https://doi.org/10.3390/buildings12081287 . .

TY  - JOUR
AU  - Nedeljković, Andrijana
AU  - Stojmenović, Marija
AU  - Gulicovski, Jelena J.
AU  - Ristić, Nenad
AU  - Milićević, Sonja
AU  - Krstić, Jugoslav B.
AU  - Kragović, Milan M.
PY  - 2020
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9730
AB  - Numerous factors influence the complexity of environmental and waste management problems, and the most significant goal is the reuse of materials that have completed their “life cycle” and the reduction in the use of new resources. In order to reduce impact of waste slag on the environment, in the present study, waste slag, generated in heating plants after lignite combustion, was characterized in detail and tested for application as a replacement for cement in mortar or concrete production. For physical–chemical characterization of slag, different experimental and instrumental techniques were used such as chemical composition and determination of the content of heavy metals, investigation of morphological and textural properties, thermal analysis, X-ray, and infrared spectroscopy. Physical–mechanical characterization of slag was also performed and included determination of activity index, water requirement, setting time and soundness. A leaching test was also performed. Presented results show that waste slag may be used in mortar and concrete production as a partial cement replacement, but after additional combustion at 650 °C and partial replacement of slag with silica fume in the minimal amount of 12%. The maximal obtained cement replacement was 20% (17.8% slag and 2.2% of silica fume).
PB  - MDPI
T2  - Minerals
T1  - Waste Slag from Heating Plants as a Partial Replacement for Cement in Mortar and Concrete Production. Part I—Physical–Chemical and Physical–Mechanical Characterization of Slag
VL  - 10
IS  - 11
SP  - 992
DO  - 10.3390/min10110992
ER  - 

@article{
author = "Nedeljković, Andrijana and Stojmenović, Marija and Gulicovski, Jelena J. and Ristić, Nenad and Milićević, Sonja and Krstić, Jugoslav B. and Kragović, Milan M.",
year = "2020",
abstract = "Numerous factors influence the complexity of environmental and waste management problems, and the most significant goal is the reuse of materials that have completed their “life cycle” and the reduction in the use of new resources. In order to reduce impact of waste slag on the environment, in the present study, waste slag, generated in heating plants after lignite combustion, was characterized in detail and tested for application as a replacement for cement in mortar or concrete production. For physical–chemical characterization of slag, different experimental and instrumental techniques were used such as chemical composition and determination of the content of heavy metals, investigation of morphological and textural properties, thermal analysis, X-ray, and infrared spectroscopy. Physical–mechanical characterization of slag was also performed and included determination of activity index, water requirement, setting time and soundness. A leaching test was also performed. Presented results show that waste slag may be used in mortar and concrete production as a partial cement replacement, but after additional combustion at 650 °C and partial replacement of slag with silica fume in the minimal amount of 12%. The maximal obtained cement replacement was 20% (17.8% slag and 2.2% of silica fume).",
publisher = "MDPI",
journal = "Minerals",
title = "Waste Slag from Heating Plants as a Partial Replacement for Cement in Mortar and Concrete Production. Part I—Physical–Chemical and Physical–Mechanical Characterization of Slag",
volume = "10",
number = "11",
pages = "992",
doi = "10.3390/min10110992"
}

Nedeljković, A., Stojmenović, M., Gulicovski, J. J., Ristić, N., Milićević, S., Krstić, J. B.,& Kragović, M. M.. (2020). Waste Slag from Heating Plants as a Partial Replacement for Cement in Mortar and Concrete Production. Part I—Physical–Chemical and Physical–Mechanical Characterization of Slag. in Minerals
MDPI., 10(11), 992.
https://doi.org/10.3390/min10110992

Nedeljković A, Stojmenović M, Gulicovski JJ, Ristić N, Milićević S, Krstić JB, Kragović MM. Waste Slag from Heating Plants as a Partial Replacement for Cement in Mortar and Concrete Production. Part I—Physical–Chemical and Physical–Mechanical Characterization of Slag. in Minerals. 2020;10(11):992.
doi:10.3390/min10110992 .

Nedeljković, Andrijana, Stojmenović, Marija, Gulicovski, Jelena J., Ristić, Nenad, Milićević, Sonja, Krstić, Jugoslav B., Kragović, Milan M., "Waste Slag from Heating Plants as a Partial Replacement for Cement in Mortar and Concrete Production. Part I—Physical–Chemical and Physical–Mechanical Characterization of Slag" in Minerals, 10, no. 11 (2020):992,
https://doi.org/10.3390/min10110992 . .

TY  - JOUR
AU  - Milićević, Sonja
AU  - Vlahović, Milica
AU  - Kragović, Milan M.
AU  - Martinović, Sanja
AU  - Milošević, Vladan
AU  - Jovanović, Ivana
AU  - Stojmenović, Marija
PY  - 2020
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9639
AB  - The intent in this paper is to define how the batch equilibrium results of copper removal from a synthetic solution on natural zeolite can be used for prediction of the breakthrough curves in the fixed-bed system for both a synthetic solution and wastewater. Natural zeolite from the Vranjska Banja deposit, Serbia, has been fully characterized (XRD, chemical composition, DTA/TG, SEM/EDS) as a clinoptilolite with cation exchange capacity of 146 meq/100 g. The maximum adsorption capacity (qm) in the batch of the mono-component system (synthetic copper solution) obtained using the Langmuir isotherm model was 7.30 and 6.10 mg/g for particle size below 0.043 and 0.6–0.8 mm, respectively. Using the flow-through system with the 0.6–0.8 mm zeolite fixed-bed, almost double the adsorption capacity (11.2–12.2 mg/g) has been achieved in a saturation point for the copper removal from the synthetic solution, compared to the batch. Better results are attributed to the constant high concentration gradient in flow-through systems compared to the batch. The complex composition of wastewater and large amounts of earth alkaline metals disturb free adsorption sights on the zeolite surface. This results in a less effective adsorption in flow-through systems with adsorption capacity in breakthrough point of 5.84 mg/g (~0.95 × qm) and in a saturation point of 7.10 mg/g (~1.15 × qm).
T2  - Minerals
T1  - Removal of Copper from Mining Wastewater Using Natural Raw Material—Comparative Study between the Synthetic and Natural Wastewater Samples
VL  - 10
IS  - 9
SP  - 753
DO  - 10.3390/min10090753
ER  - 

@article{
author = "Milićević, Sonja and Vlahović, Milica and Kragović, Milan M. and Martinović, Sanja and Milošević, Vladan and Jovanović, Ivana and Stojmenović, Marija",
year = "2020",
abstract = "The intent in this paper is to define how the batch equilibrium results of copper removal from a synthetic solution on natural zeolite can be used for prediction of the breakthrough curves in the fixed-bed system for both a synthetic solution and wastewater. Natural zeolite from the Vranjska Banja deposit, Serbia, has been fully characterized (XRD, chemical composition, DTA/TG, SEM/EDS) as a clinoptilolite with cation exchange capacity of 146 meq/100 g. The maximum adsorption capacity (qm) in the batch of the mono-component system (synthetic copper solution) obtained using the Langmuir isotherm model was 7.30 and 6.10 mg/g for particle size below 0.043 and 0.6–0.8 mm, respectively. Using the flow-through system with the 0.6–0.8 mm zeolite fixed-bed, almost double the adsorption capacity (11.2–12.2 mg/g) has been achieved in a saturation point for the copper removal from the synthetic solution, compared to the batch. Better results are attributed to the constant high concentration gradient in flow-through systems compared to the batch. The complex composition of wastewater and large amounts of earth alkaline metals disturb free adsorption sights on the zeolite surface. This results in a less effective adsorption in flow-through systems with adsorption capacity in breakthrough point of 5.84 mg/g (~0.95 × qm) and in a saturation point of 7.10 mg/g (~1.15 × qm).",
journal = "Minerals",
title = "Removal of Copper from Mining Wastewater Using Natural Raw Material—Comparative Study between the Synthetic and Natural Wastewater Samples",
volume = "10",
number = "9",
pages = "753",
doi = "10.3390/min10090753"
}

Milićević, S., Vlahović, M., Kragović, M. M., Martinović, S., Milošević, V., Jovanović, I.,& Stojmenović, M.. (2020). Removal of Copper from Mining Wastewater Using Natural Raw Material—Comparative Study between the Synthetic and Natural Wastewater Samples. in Minerals, 10(9), 753.
https://doi.org/10.3390/min10090753

Milićević S, Vlahović M, Kragović MM, Martinović S, Milošević V, Jovanović I, Stojmenović M. Removal of Copper from Mining Wastewater Using Natural Raw Material—Comparative Study between the Synthetic and Natural Wastewater Samples. in Minerals. 2020;10(9):753.
doi:10.3390/min10090753 .

Milićević, Sonja, Vlahović, Milica, Kragović, Milan M., Martinović, Sanja, Milošević, Vladan, Jovanović, Ivana, Stojmenović, Marija, "Removal of Copper from Mining Wastewater Using Natural Raw Material—Comparative Study between the Synthetic and Natural Wastewater Samples" in Minerals, 10, no. 9 (2020):753,
https://doi.org/10.3390/min10090753 . .

TY  - JOUR
AU  - Milićević, Sonja Z.
AU  - Boljanac, Tamara
AU  - Martinović, Sanja
AU  - Vlahović, Milica
AU  - Milošević, Vladan
AU  - Babić, Biljana M.
PY  - 2012
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4720
AB  - Serbian lignite from Kolubara deposit was used as a low cost adsorbent for removal of copper ions (Cu2+) from aqueous solutions. Lignite was subjected to the elementary and technical analysis as well as BET and FTIR analysis due to complete characterization. Basic comparison between lignite and activated carbon was also done. As a method, batch adsorption procedure was applied. Adsorption efficiency was studied as a function of the initial metal concentration, pH of the solution, contact time, and amount of the adsorbent. Optimum removal of copper ions was achieved at pH values of 5.0. About 90% of copper cations were removed in 5 min of contact time from the solution with the lowest copper concentration (50 mg Cu2+/l) regardless adsorbent amount, while the same effect of adsorption was achieved in 60 min in case of solutions with higher concentrations of copper. It was concluded that the effect of adsorbent amount on adsorption kinetics is evident but not crucial. It was proved that the experimental results of copper adsorption fit well to a Langmuirian type isotherm which was used to describe monitored adsorption phenomena. The calculated adsorption capacities of lignite for copper adsorption decrease with increasing adsorbent amount. The study proved that tested lignite is very efficient adsorbent material, especially in case of low copper concentration in aqueous solution where the usual methods are either economically unrewarding or technically complicated. This behavior can be explained by FTIR spectrum despite a small specific surface area of lignite. Namely, many bands (peaks) are attributed to the functional groups that they are involved in chemisorption and ionic exchange, basic mechanisms of copper adsorption. (C) 2011 Elsevier B.V. All rights reserved.
T2  - Fuel Processing Technology
T1  - Removal of copper from aqueous solutions by low cost adsorbent-Kolubara lignite
VL  - 95
SP  - 1
EP  - 7
DO  - 10.1016/j.fuproc.2011.11.005
ER  - 

@article{
author = "Milićević, Sonja Z. and Boljanac, Tamara and Martinović, Sanja and Vlahović, Milica and Milošević, Vladan and Babić, Biljana M.",
year = "2012",
abstract = "Serbian lignite from Kolubara deposit was used as a low cost adsorbent for removal of copper ions (Cu2+) from aqueous solutions. Lignite was subjected to the elementary and technical analysis as well as BET and FTIR analysis due to complete characterization. Basic comparison between lignite and activated carbon was also done. As a method, batch adsorption procedure was applied. Adsorption efficiency was studied as a function of the initial metal concentration, pH of the solution, contact time, and amount of the adsorbent. Optimum removal of copper ions was achieved at pH values of 5.0. About 90% of copper cations were removed in 5 min of contact time from the solution with the lowest copper concentration (50 mg Cu2+/l) regardless adsorbent amount, while the same effect of adsorption was achieved in 60 min in case of solutions with higher concentrations of copper. It was concluded that the effect of adsorbent amount on adsorption kinetics is evident but not crucial. It was proved that the experimental results of copper adsorption fit well to a Langmuirian type isotherm which was used to describe monitored adsorption phenomena. The calculated adsorption capacities of lignite for copper adsorption decrease with increasing adsorbent amount. The study proved that tested lignite is very efficient adsorbent material, especially in case of low copper concentration in aqueous solution where the usual methods are either economically unrewarding or technically complicated. This behavior can be explained by FTIR spectrum despite a small specific surface area of lignite. Namely, many bands (peaks) are attributed to the functional groups that they are involved in chemisorption and ionic exchange, basic mechanisms of copper adsorption. (C) 2011 Elsevier B.V. All rights reserved.",
journal = "Fuel Processing Technology",
title = "Removal of copper from aqueous solutions by low cost adsorbent-Kolubara lignite",
volume = "95",
pages = "1-7",
doi = "10.1016/j.fuproc.2011.11.005"
}

Milićević, S. Z., Boljanac, T., Martinović, S., Vlahović, M., Milošević, V.,& Babić, B. M.. (2012). Removal of copper from aqueous solutions by low cost adsorbent-Kolubara lignite. in Fuel Processing Technology, 95, 1-7.
https://doi.org/10.1016/j.fuproc.2011.11.005

Milićević SZ, Boljanac T, Martinović S, Vlahović M, Milošević V, Babić BM. Removal of copper from aqueous solutions by low cost adsorbent-Kolubara lignite. in Fuel Processing Technology. 2012;95:1-7.
doi:10.1016/j.fuproc.2011.11.005 .

Milićević, Sonja Z., Boljanac, Tamara, Martinović, Sanja, Vlahović, Milica, Milošević, Vladan, Babić, Biljana M., "Removal of copper from aqueous solutions by low cost adsorbent-Kolubara lignite" in Fuel Processing Technology, 95 (2012):1-7,
https://doi.org/10.1016/j.fuproc.2011.11.005 . .

TY  - JOUR
AU  - Kragović, Milan M.
AU  - Dakovic, Aleksandra S.
AU  - Milićević, Sonja Z.
AU  - Sekulic, Zivko T.
AU  - Milonjić, Slobodan K.
PY  - 2009
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3815
AB  - In this paper, the results of the surface modification of natural zeolite with different amounts (2, 5 and 10 mmol M(+)/100 g) of octadecyldimethylbenzyl ammonium ions (ODMBA) are presented. The obtained organozeohtes were denoted as OZ-2, OZ-5 and OZ-10. The degree of ion exchange was followed by determination of amounts of inorganic cations released from zeolite. Results confirmed that reaction between ODMBA and starting zeolite has occurred via ion exchange mechanism. The obtained value for point of zero charge, pH(pzc), of natural zeolite was 6.8 +/- 0.1, while for OZ-2, OZ-5 and OZ-10 pH(pzc) was 7.0 +/- 0.1. Below the pH(pzc), the surfaces of materials are positive while at pH values higher than pH(pzc) their surfaces are negative. Compared to the pHpzc of natural zeolite, no significant differences in pH(pzc) was observed for all three organozeolites indicating that obtained products have similar functional groups with similar acid and basic characteristics as starting zeolite. The pH(pzc) was not dependent on the amount of ODMBA ions at the zeolitic surface and the value of pH(pzc) for all investigated sorbents is the same for all three electrolyte concentrations indicating that the pH(pzc) of each material is independent of the ionic strength of KNO(3).
T2  - Hemijska industrija
T1  - Influence of Organic Cations Sorption on the Point of Zero Charge of Natural Zeolite
VL  - 63
IS  - 4
SP  - 325
EP  - 330
DO  - 10.2298/HEMIND0904325K
ER  - 

@article{
author = "Kragović, Milan M. and Dakovic, Aleksandra S. and Milićević, Sonja Z. and Sekulic, Zivko T. and Milonjić, Slobodan K.",
year = "2009",
abstract = "In this paper, the results of the surface modification of natural zeolite with different amounts (2, 5 and 10 mmol M(+)/100 g) of octadecyldimethylbenzyl ammonium ions (ODMBA) are presented. The obtained organozeohtes were denoted as OZ-2, OZ-5 and OZ-10. The degree of ion exchange was followed by determination of amounts of inorganic cations released from zeolite. Results confirmed that reaction between ODMBA and starting zeolite has occurred via ion exchange mechanism. The obtained value for point of zero charge, pH(pzc), of natural zeolite was 6.8 +/- 0.1, while for OZ-2, OZ-5 and OZ-10 pH(pzc) was 7.0 +/- 0.1. Below the pH(pzc), the surfaces of materials are positive while at pH values higher than pH(pzc) their surfaces are negative. Compared to the pHpzc of natural zeolite, no significant differences in pH(pzc) was observed for all three organozeolites indicating that obtained products have similar functional groups with similar acid and basic characteristics as starting zeolite. The pH(pzc) was not dependent on the amount of ODMBA ions at the zeolitic surface and the value of pH(pzc) for all investigated sorbents is the same for all three electrolyte concentrations indicating that the pH(pzc) of each material is independent of the ionic strength of KNO(3).",
journal = "Hemijska industrija",
title = "Influence of Organic Cations Sorption on the Point of Zero Charge of Natural Zeolite",
volume = "63",
number = "4",
pages = "325-330",
doi = "10.2298/HEMIND0904325K"
}

Kragović, M. M., Dakovic, A. S., Milićević, S. Z., Sekulic, Z. T.,& Milonjić, S. K.. (2009). Influence of Organic Cations Sorption on the Point of Zero Charge of Natural Zeolite. in Hemijska industrija, 63(4), 325-330.
https://doi.org/10.2298/HEMIND0904325K

Kragović MM, Dakovic AS, Milićević SZ, Sekulic ZT, Milonjić SK. Influence of Organic Cations Sorption on the Point of Zero Charge of Natural Zeolite. in Hemijska industrija. 2009;63(4):325-330.
doi:10.2298/HEMIND0904325K .

Kragović, Milan M., Dakovic, Aleksandra S., Milićević, Sonja Z., Sekulic, Zivko T., Milonjić, Slobodan K., "Influence of Organic Cations Sorption on the Point of Zero Charge of Natural Zeolite" in Hemijska industrija, 63, no. 4 (2009):325-330,
https://doi.org/10.2298/HEMIND0904325K . .