TY  - CONF
AU  - Vukčević, Marija
AU  - Maletić, Marina
AU  - Kalijadis, Ana
AU  - Babić, Biljana
AU  - Đurkić, Tatjana
AU  - Laušević, Mila
PY  - 2018
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11032
AB  - Zagađenje vodenih tokova teškim metalima je jedan od najakutnijih ekoloških
problema današnjice. S obzirom na to da teški metali nisu biorazgradivi, oni se akumuliraju
u životnoj sredini i na taj način ulaze u lanac ishrane ljudi i životinja, pa kao veoma toksične
materije, mogu izazivati niz opasnih i često neizlečivih bolesti. Iz tog razloga, istraživači
godinama u nazad razvijaju nove i usavršavaju postojeće tehnike za prečišćavanje otpadnih
voda od ovih zagađujućih materija [1]. Za prečišćavanje vode zagađene teškim metalima
mogu se koristiti različite metode: hemijska precipitacija, elektrohemijski tretmani, filtracija,
reverzna osmoza, jonska izmena, membranski procesi, adsorpcija. Jedna od najčešće
korišćenih je adsorpcija, koja zbog mogućnosti regenerisanja adsorbenta, odgovarajućim
desorpcionim procesom, predstavlja veoma efektivnu i ekonomičnu metodu. Zahvaljujući
razvijenoj specifičnoj površini i poroznosti, kao i prisustvu funkcionalnih grupa na površini,
različiti ugljenični materijali pokazuju visoku efikasnost u uklanjanju teških metala iz
vode. Karbon kriogel (CC) predstavlja ugljenični materijal razvijene mezoporoznosti čije
se adsorpcione karakteristike mogu poboljšati optimizacijom i kontrolisanjem parametara
dobijanja. U ovom radu je ispitana mogućnost uklanjanja jona teških metala (Cd2+, Ni2+ i
Zn2+) iz vode, korišćenjem karbon kriogela i hemijski modifikovanog karbon kriogela.
Prvi korak u sintezi karbon kriogela je polikondenzacija rezorcinola i formaldehida,
u prisustvu natrijum-karbonata kao katalizatora. Organski kriogel pripremljen je solgel tehnologijom uz naknadno sušenje postupkom zamrzavanja, dok je karbonizacija
organskog kriogela vršena u inertnoj atmosferi argona na temperaturi od 800 o
C [2]. U
cilju poboljšanja adsorpcionih karakteristika karbon kriogela, izvršeno je hemijsko
modifikovanje korišćenjem 5 M HNO3
. Karakterizacija materijala izvršena je merenjem
specifične površine BET metodom, određivanjem tačke nultog naelektrisanja metodom
masene titracije, kao i određivanjem vrsta funkcionalnih grupa prisutnih na površini
materijala, metodom infracrvene spektroskopije sa Furijeovom transformacijom (FTIR).
Ispitan je uticaj pH vrednosti rastvora, početne koncentracije jona metala u rastvoru, kao i
vremena kontakta na adsorpciju teških metala uzorcima karbon kriogela.Primenjenom hemijskom modifikacijom karbon kriogela ne dolazi do bitnijih
promena u specifičnoj površini i poroznosti materijala. S druge strane, ovim postupkom
dolazi do izmene površinske hemije materijala, uvođenjem novih, i povećanjem broja
postojećih kiselih površinskih grupa, što je pokazano FTIR analizom i smanjenjem
vrednosti tačke nultog naelektrisanja sa pHPZC = 9,3 na pHPZC = 3,1. Adsorpcija jona teških
metala na modifikovanom i nemodifikovanom karbon kriogelu vršena je na pH = 6, jer pri
ovoj pH vrednosti materijali pokazuju najveći adsorpcioni kapacitet, a ujedno je izborom
ove pH izbegnuta precipitacija hidroksida metala. Izmene u hemiji površine dovode i do
izmena adsorpcionih karakteristika karbon kriogela. Kako površinske grupe predstavljaju
aktivna mesta za adsorpciju jona teških metala, povećanje količine površinskih grupa kod
modifikovanog karbon kriogela dovodi do višestrukog povećanja adsorpcionog kapaciteta.
PB  - Belgrade : Serbian Chemical Society
C3  - ENVIROCHEM 2018 : 8th Symposium Chemistry and Environmental Protection : program and the book of abstracts
T1  - Karbon kriogel kao adsorbent za uklanjanje Cd(II), Zn(II) i Ni(II) jona iz vode
T1  - Carbon cryogel as an adsorbent for removal of Cd(II), Zn(II) and Ni(II) ions from water
SP  - 85
EP  - 86
UR  - https://hdl.handle.net/21.15107/rcub_vinar_11032
ER  - 

@conference{
author = "Vukčević, Marija and Maletić, Marina and Kalijadis, Ana and Babić, Biljana and Đurkić, Tatjana and Laušević, Mila",
year = "2018",
abstract = "Zagađenje vodenih tokova teškim metalima je jedan od najakutnijih ekoloških
problema današnjice. S obzirom na to da teški metali nisu biorazgradivi, oni se akumuliraju
u životnoj sredini i na taj način ulaze u lanac ishrane ljudi i životinja, pa kao veoma toksične
materije, mogu izazivati niz opasnih i često neizlečivih bolesti. Iz tog razloga, istraživači
godinama u nazad razvijaju nove i usavršavaju postojeće tehnike za prečišćavanje otpadnih
voda od ovih zagađujućih materija [1]. Za prečišćavanje vode zagađene teškim metalima
mogu se koristiti različite metode: hemijska precipitacija, elektrohemijski tretmani, filtracija,
reverzna osmoza, jonska izmena, membranski procesi, adsorpcija. Jedna od najčešće
korišćenih je adsorpcija, koja zbog mogućnosti regenerisanja adsorbenta, odgovarajućim
desorpcionim procesom, predstavlja veoma efektivnu i ekonomičnu metodu. Zahvaljujući
razvijenoj specifičnoj površini i poroznosti, kao i prisustvu funkcionalnih grupa na površini,
različiti ugljenični materijali pokazuju visoku efikasnost u uklanjanju teških metala iz
vode. Karbon kriogel (CC) predstavlja ugljenični materijal razvijene mezoporoznosti čije
se adsorpcione karakteristike mogu poboljšati optimizacijom i kontrolisanjem parametara
dobijanja. U ovom radu je ispitana mogućnost uklanjanja jona teških metala (Cd2+, Ni2+ i
Zn2+) iz vode, korišćenjem karbon kriogela i hemijski modifikovanog karbon kriogela.
Prvi korak u sintezi karbon kriogela je polikondenzacija rezorcinola i formaldehida,
u prisustvu natrijum-karbonata kao katalizatora. Organski kriogel pripremljen je solgel tehnologijom uz naknadno sušenje postupkom zamrzavanja, dok je karbonizacija
organskog kriogela vršena u inertnoj atmosferi argona na temperaturi od 800 o
C [2]. U
cilju poboljšanja adsorpcionih karakteristika karbon kriogela, izvršeno je hemijsko
modifikovanje korišćenjem 5 M HNO3
. Karakterizacija materijala izvršena je merenjem
specifične površine BET metodom, određivanjem tačke nultog naelektrisanja metodom
masene titracije, kao i određivanjem vrsta funkcionalnih grupa prisutnih na površini
materijala, metodom infracrvene spektroskopije sa Furijeovom transformacijom (FTIR).
Ispitan je uticaj pH vrednosti rastvora, početne koncentracije jona metala u rastvoru, kao i
vremena kontakta na adsorpciju teških metala uzorcima karbon kriogela.Primenjenom hemijskom modifikacijom karbon kriogela ne dolazi do bitnijih
promena u specifičnoj površini i poroznosti materijala. S druge strane, ovim postupkom
dolazi do izmene površinske hemije materijala, uvođenjem novih, i povećanjem broja
postojećih kiselih površinskih grupa, što je pokazano FTIR analizom i smanjenjem
vrednosti tačke nultog naelektrisanja sa pHPZC = 9,3 na pHPZC = 3,1. Adsorpcija jona teških
metala na modifikovanom i nemodifikovanom karbon kriogelu vršena je na pH = 6, jer pri
ovoj pH vrednosti materijali pokazuju najveći adsorpcioni kapacitet, a ujedno je izborom
ove pH izbegnuta precipitacija hidroksida metala. Izmene u hemiji površine dovode i do
izmena adsorpcionih karakteristika karbon kriogela. Kako površinske grupe predstavljaju
aktivna mesta za adsorpciju jona teških metala, povećanje količine površinskih grupa kod
modifikovanog karbon kriogela dovodi do višestrukog povećanja adsorpcionog kapaciteta.",
publisher = "Belgrade : Serbian Chemical Society",
journal = "ENVIROCHEM 2018 : 8th Symposium Chemistry and Environmental Protection : program and the book of abstracts",
title = "Karbon kriogel kao adsorbent za uklanjanje Cd(II), Zn(II) i Ni(II) jona iz vode, Carbon cryogel as an adsorbent for removal of Cd(II), Zn(II) and Ni(II) ions from water",
pages = "85-86",
url = "https://hdl.handle.net/21.15107/rcub_vinar_11032"
}

Vukčević, M., Maletić, M., Kalijadis, A., Babić, B., Đurkić, T.,& Laušević, M.. (2018). Karbon kriogel kao adsorbent za uklanjanje Cd(II), Zn(II) i Ni(II) jona iz vode. in ENVIROCHEM 2018 : 8th Symposium Chemistry and Environmental Protection : program and the book of abstracts
Belgrade : Serbian Chemical Society., 85-86.
https://hdl.handle.net/21.15107/rcub_vinar_11032

Vukčević M, Maletić M, Kalijadis A, Babić B, Đurkić T, Laušević M. Karbon kriogel kao adsorbent za uklanjanje Cd(II), Zn(II) i Ni(II) jona iz vode. in ENVIROCHEM 2018 : 8th Symposium Chemistry and Environmental Protection : program and the book of abstracts. 2018;:85-86.
https://hdl.handle.net/21.15107/rcub_vinar_11032 .

Vukčević, Marija, Maletić, Marina, Kalijadis, Ana, Babić, Biljana, Đurkić, Tatjana, Laušević, Mila, "Karbon kriogel kao adsorbent za uklanjanje Cd(II), Zn(II) i Ni(II) jona iz vode" in ENVIROCHEM 2018 : 8th Symposium Chemistry and Environmental Protection : program and the book of abstracts (2018):85-86,
https://hdl.handle.net/21.15107/rcub_vinar_11032 .

TY  - CONF
AU  - Maletić, Marina
AU  - Vukčević, Mira
AU  - Kalijadis, Ana
AU  - Janković-Častvan, Ivona
AU  - Dapčević, Aleksandra
AU  - Laušević, Zoran
AU  - Laušević, Mila
PY  - 2016
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9172
AB  - TiO2/carbon    composite    (TiO2/HTC),    synthesized    by    hydrothermal carbonization,  was  characterized  by  thermogravimetric  analysis,  nitrogen adsorption–desorption  isotherms  and  X-ray  diffraction.  The  possibility  of using   TiO2/HTC   as   photocatalysts   for   UV   and   visible   light   assisted degradation  of  methylene  blue  inaqueous  solution  was  examined.  It  was found  that  carbon  presence  in  TiO2/HTC  leads  to  the  higher  porosity  and increase in the share of photocatalytically active anatase phase. Compared to the   hydrothermally   synthesized   TiO2,   TiO2/HTC   showed   the   superior photocatalytic  activity  under  UV  irradiation.  In  addition,  TiO2/HTC  show high  recycling  ability  with  degradation  ratio  of  methylene  blue  higher  than 81%  after  five  cycles.  Also,  TiO2/HTC  is  expected  to  be  a  promising candidate for photocatalytic processes using visible light.
PB  - Society of Physical Chemists of Serbia
C3  - Physical chemistry 2016 : 13th international conference on fundamental and applied aspects of physical chemistry
T1  - One-step hydrothermal synthesis of photocatalytically active TiO2/carbon composite
SP  - C-12-P
UR  - https://hdl.handle.net/21.15107/rcub_vinar_9172
ER  - 

@conference{
author = "Maletić, Marina and Vukčević, Mira and Kalijadis, Ana and Janković-Častvan, Ivona and Dapčević, Aleksandra and Laušević, Zoran and Laušević, Mila",
year = "2016",
abstract = "TiO2/carbon    composite    (TiO2/HTC),    synthesized    by    hydrothermal carbonization,  was  characterized  by  thermogravimetric  analysis,  nitrogen adsorption–desorption  isotherms  and  X-ray  diffraction.  The  possibility  of using   TiO2/HTC   as   photocatalysts   for   UV   and   visible   light   assisted degradation  of  methylene  blue  inaqueous  solution  was  examined.  It  was found  that  carbon  presence  in  TiO2/HTC  leads  to  the  higher  porosity  and increase in the share of photocatalytically active anatase phase. Compared to the   hydrothermally   synthesized   TiO2,   TiO2/HTC   showed   the   superior photocatalytic  activity  under  UV  irradiation.  In  addition,  TiO2/HTC  show high  recycling  ability  with  degradation  ratio  of  methylene  blue  higher  than 81%  after  five  cycles.  Also,  TiO2/HTC  is  expected  to  be  a  promising candidate for photocatalytic processes using visible light.",
publisher = "Society of Physical Chemists of Serbia",
journal = "Physical chemistry 2016 : 13th international conference on fundamental and applied aspects of physical chemistry",
title = "One-step hydrothermal synthesis of photocatalytically active TiO2/carbon composite",
pages = "C-12-P",
url = "https://hdl.handle.net/21.15107/rcub_vinar_9172"
}

Maletić, M., Vukčević, M., Kalijadis, A., Janković-Častvan, I., Dapčević, A., Laušević, Z.,& Laušević, M.. (2016). One-step hydrothermal synthesis of photocatalytically active TiO2/carbon composite. in Physical chemistry 2016 : 13th international conference on fundamental and applied aspects of physical chemistry
Society of Physical Chemists of Serbia., C-12-P.
https://hdl.handle.net/21.15107/rcub_vinar_9172

Maletić M, Vukčević M, Kalijadis A, Janković-Častvan I, Dapčević A, Laušević Z, Laušević M. One-step hydrothermal synthesis of photocatalytically active TiO2/carbon composite. in Physical chemistry 2016 : 13th international conference on fundamental and applied aspects of physical chemistry. 2016;:C-12-P.
https://hdl.handle.net/21.15107/rcub_vinar_9172 .

Maletić, Marina, Vukčević, Mira, Kalijadis, Ana, Janković-Častvan, Ivona, Dapčević, Aleksandra, Laušević, Zoran, Laušević, Mila, "One-step hydrothermal synthesis of photocatalytically active TiO2/carbon composite" in Physical chemistry 2016 : 13th international conference on fundamental and applied aspects of physical chemistry (2016):C-12-P,
https://hdl.handle.net/21.15107/rcub_vinar_9172 .

TY  - CONF
AU  - Vukčević, Mira
AU  - Pajić-Lijaković, Ivana
AU  - Kalijadis, Ana
AU  - Laušević, Zoran
AU  - Laušević, Mila
PY  - 2014
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9225
AB  - Activated carbon obtained by carbonization and activation of waste hemp
fibers was used as an efficient, low-cost sorbent for pesticide removal. Data
obtained from batch and continuous process of pesticide adsorption was
used for development of the mathematical model that describes the
phenomenon of pesticide transport through the porous sorbent matrices.
Effective diffusion coefficient and the pesticide concentration profile within
the activated hemp fibers, obtained as results of proposed model, give the
insight in the mechanism and the rate of adsorption process and pesticide
transport through the sorbent. A good agreement between model prediction
and the experimental data indicates that the proposed mathematical model
can be successfully used for optimization and selection of appropriate
adsorption process for pesticide removal.
PB  - Society of Physical Chemists of Serbia
C3  - Physical chemistry 2014: 12th International Conference on Fundamental and Applied Aspects of Physical Chemistry
T1  - Mathematical modeling of pesticide adsorption on activated hemp fibers
VL  - K-04-O
UR  - https://hdl.handle.net/21.15107/rcub_vinar_9225
ER  - 

@conference{
author = "Vukčević, Mira and Pajić-Lijaković, Ivana and Kalijadis, Ana and Laušević, Zoran and Laušević, Mila",
year = "2014",
abstract = "Activated carbon obtained by carbonization and activation of waste hemp
fibers was used as an efficient, low-cost sorbent for pesticide removal. Data
obtained from batch and continuous process of pesticide adsorption was
used for development of the mathematical model that describes the
phenomenon of pesticide transport through the porous sorbent matrices.
Effective diffusion coefficient and the pesticide concentration profile within
the activated hemp fibers, obtained as results of proposed model, give the
insight in the mechanism and the rate of adsorption process and pesticide
transport through the sorbent. A good agreement between model prediction
and the experimental data indicates that the proposed mathematical model
can be successfully used for optimization and selection of appropriate
adsorption process for pesticide removal.",
publisher = "Society of Physical Chemists of Serbia",
journal = "Physical chemistry 2014: 12th International Conference on Fundamental and Applied Aspects of Physical Chemistry",
title = "Mathematical modeling of pesticide adsorption on activated hemp fibers",
volume = "K-04-O",
url = "https://hdl.handle.net/21.15107/rcub_vinar_9225"
}

Vukčević, M., Pajić-Lijaković, I., Kalijadis, A., Laušević, Z.,& Laušević, M.. (2014). Mathematical modeling of pesticide adsorption on activated hemp fibers. in Physical chemistry 2014: 12th International Conference on Fundamental and Applied Aspects of Physical Chemistry
Society of Physical Chemists of Serbia., K-04-O.
https://hdl.handle.net/21.15107/rcub_vinar_9225

Vukčević M, Pajić-Lijaković I, Kalijadis A, Laušević Z, Laušević M. Mathematical modeling of pesticide adsorption on activated hemp fibers. in Physical chemistry 2014: 12th International Conference on Fundamental and Applied Aspects of Physical Chemistry. 2014;K-04-O.
https://hdl.handle.net/21.15107/rcub_vinar_9225 .

Vukčević, Mira, Pajić-Lijaković, Ivana, Kalijadis, Ana, Laušević, Zoran, Laušević, Mila, "Mathematical modeling of pesticide adsorption on activated hemp fibers" in Physical chemistry 2014: 12th International Conference on Fundamental and Applied Aspects of Physical Chemistry, K-04-O (2014),
https://hdl.handle.net/21.15107/rcub_vinar_9225 .

TY  - CONF
AU  - Kalijadis, Ana
AU  - Vukčević, Mira
AU  - Maletić, Marina
AU  - Laušević, Mila
AU  - Laušević, Zoran
PY  - 2014
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9235
AB  - Structural and surface characterization of pristine and boron doped
carbonized hydrothermal carbons (CHTC) is reported. Boron was
introduced into glucose precursor solution with concentration of 0.2% and
1%. Following hydrothermal treatment, samples were carbonized to 1000oC
and examined by Raman spectroscopy and temperature programmed
desorption. Characterization of obtained samples as material for carbon
paste electrode was performed by cyclic voltammetry measurements of the
Fe (CN)6
3-/4- redox couple. Structural analysis showed that lower boron
content in precursor solution induced structure ordering, while higher
amount of boron caused structural disorder of CHTC sample. Boron
presence in CHTC samples reduced number of surface active sites for
oxygen adsorption and consequently improved their electrochemical
response as electrode material for carbon paste electrode.
PB  - Society of Physical Chemists of Serbia
C3  - Physical chemistry 2014: 12th International Conference on Fundamental and Applied Aspects of Physical Chemistry
T1  - Thermal treatment influence on the surface characteristics of the borondoped hydrothermal carbon
VL  - H-22-P
UR  - https://hdl.handle.net/21.15107/rcub_vinar_9235
ER  - 

@conference{
author = "Kalijadis, Ana and Vukčević, Mira and Maletić, Marina and Laušević, Mila and Laušević, Zoran",
year = "2014",
abstract = "Structural and surface characterization of pristine and boron doped
carbonized hydrothermal carbons (CHTC) is reported. Boron was
introduced into glucose precursor solution with concentration of 0.2% and
1%. Following hydrothermal treatment, samples were carbonized to 1000oC
and examined by Raman spectroscopy and temperature programmed
desorption. Characterization of obtained samples as material for carbon
paste electrode was performed by cyclic voltammetry measurements of the
Fe (CN)6
3-/4- redox couple. Structural analysis showed that lower boron
content in precursor solution induced structure ordering, while higher
amount of boron caused structural disorder of CHTC sample. Boron
presence in CHTC samples reduced number of surface active sites for
oxygen adsorption and consequently improved their electrochemical
response as electrode material for carbon paste electrode.",
publisher = "Society of Physical Chemists of Serbia",
journal = "Physical chemistry 2014: 12th International Conference on Fundamental and Applied Aspects of Physical Chemistry",
title = "Thermal treatment influence on the surface characteristics of the borondoped hydrothermal carbon",
volume = "H-22-P",
url = "https://hdl.handle.net/21.15107/rcub_vinar_9235"
}

Kalijadis, A., Vukčević, M., Maletić, M., Laušević, M.,& Laušević, Z.. (2014). Thermal treatment influence on the surface characteristics of the borondoped hydrothermal carbon. in Physical chemistry 2014: 12th International Conference on Fundamental and Applied Aspects of Physical Chemistry
Society of Physical Chemists of Serbia., H-22-P.
https://hdl.handle.net/21.15107/rcub_vinar_9235

Kalijadis A, Vukčević M, Maletić M, Laušević M, Laušević Z. Thermal treatment influence on the surface characteristics of the borondoped hydrothermal carbon. in Physical chemistry 2014: 12th International Conference on Fundamental and Applied Aspects of Physical Chemistry. 2014;H-22-P.
https://hdl.handle.net/21.15107/rcub_vinar_9235 .

Kalijadis, Ana, Vukčević, Mira, Maletić, Marina, Laušević, Mila, Laušević, Zoran, "Thermal treatment influence on the surface characteristics of the borondoped hydrothermal carbon" in Physical chemistry 2014: 12th International Conference on Fundamental and Applied Aspects of Physical Chemistry, H-22-P (2014),
https://hdl.handle.net/21.15107/rcub_vinar_9235 .