TY  - JOUR
AU  - Vukčević, Marija
AU  - Pejić, Biljana
AU  - Kalijadis, Ana
AU  - Pajić-Lijaković, Ivana
AU  - Kostić, Mirjana M.
AU  - Laušević, Zoran
AU  - Laušević, Mila D.
PY  - 2014
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5815
AB  - Carbonized hemp fibers obtained by carbonization of origin and chemically modified waste hemp fibers was used as a low-cost sorbent for heavy metals removal. The efficiency of carbonized hemp fiber samples as a sorbent was tested through the adsorption of lead ions as a heavy metal model ion. Although changes in carbon precursor structure, induced by chemical modification, affect the sorption process and sorption capacity of carbonized hemp fibers, all carbonized hemp fibers samples show good adsorption properties toward lead ions. Obtained experimental data was used for development of the mathematical model that describes both the phenomenon of metal ions transport through the porous sorbent matrices, and the structure of carbonized hemp fibers. Effective diffusion coefficient, damping coefficient and the lead ion concentration profile within the carbonized hemp fibers, obtained as results of proposed mathematical model, give the insight in the mechanism and the rate of adsorption process, while average tortuosity connected the sorbent structure and ions transport through the sorbent. A good agreement between model prediction for both structural and ion transport model parameters and the experimental data, indicates that the proposed mathematical model can be successfully used for optimization of heavy metal ions adsorption process by correlating the model parameters to the carbonized hemp fibers performances. (C) 2013 Elsevier B.V. All rights reserved.
T2  - Chemical Engineering Journal
T1  - Carbon materials from waste short hemp fibers as a sorbent for heavy metal ions - Mathematical modeling of sorbent structure and ions transport
VL  - 235
SP  - 284
EP  - 292
DO  - 10.1016/j.cej.2013.09.047
ER  - 

@article{
author = "Vukčević, Marija and Pejić, Biljana and Kalijadis, Ana and Pajić-Lijaković, Ivana and Kostić, Mirjana M. and Laušević, Zoran and Laušević, Mila D.",
year = "2014",
abstract = "Carbonized hemp fibers obtained by carbonization of origin and chemically modified waste hemp fibers was used as a low-cost sorbent for heavy metals removal. The efficiency of carbonized hemp fiber samples as a sorbent was tested through the adsorption of lead ions as a heavy metal model ion. Although changes in carbon precursor structure, induced by chemical modification, affect the sorption process and sorption capacity of carbonized hemp fibers, all carbonized hemp fibers samples show good adsorption properties toward lead ions. Obtained experimental data was used for development of the mathematical model that describes both the phenomenon of metal ions transport through the porous sorbent matrices, and the structure of carbonized hemp fibers. Effective diffusion coefficient, damping coefficient and the lead ion concentration profile within the carbonized hemp fibers, obtained as results of proposed mathematical model, give the insight in the mechanism and the rate of adsorption process, while average tortuosity connected the sorbent structure and ions transport through the sorbent. A good agreement between model prediction for both structural and ion transport model parameters and the experimental data, indicates that the proposed mathematical model can be successfully used for optimization of heavy metal ions adsorption process by correlating the model parameters to the carbonized hemp fibers performances. (C) 2013 Elsevier B.V. All rights reserved.",
journal = "Chemical Engineering Journal",
title = "Carbon materials from waste short hemp fibers as a sorbent for heavy metal ions - Mathematical modeling of sorbent structure and ions transport",
volume = "235",
pages = "284-292",
doi = "10.1016/j.cej.2013.09.047"
}

Vukčević, M., Pejić, B., Kalijadis, A., Pajić-Lijaković, I., Kostić, M. M., Laušević, Z.,& Laušević, M. D.. (2014). Carbon materials from waste short hemp fibers as a sorbent for heavy metal ions - Mathematical modeling of sorbent structure and ions transport. in Chemical Engineering Journal, 235, 284-292.
https://doi.org/10.1016/j.cej.2013.09.047

Vukčević M, Pejić B, Kalijadis A, Pajić-Lijaković I, Kostić MM, Laušević Z, Laušević MD. Carbon materials from waste short hemp fibers as a sorbent for heavy metal ions - Mathematical modeling of sorbent structure and ions transport. in Chemical Engineering Journal. 2014;235:284-292.
doi:10.1016/j.cej.2013.09.047 .

Vukčević, Marija, Pejić, Biljana, Kalijadis, Ana, Pajić-Lijaković, Ivana, Kostić, Mirjana M., Laušević, Zoran, Laušević, Mila D., "Carbon materials from waste short hemp fibers as a sorbent for heavy metal ions - Mathematical modeling of sorbent structure and ions transport" in Chemical Engineering Journal, 235 (2014):284-292,
https://doi.org/10.1016/j.cej.2013.09.047 . .

TY  - JOUR
AU  - Vukčević, Marija
AU  - Kalijadis, Ana
AU  - Radisic, Marina
AU  - Pejić, Biljana
AU  - Kostić, Mirjana M.
AU  - Laušević, Zoran
AU  - Laušević, Mila D.
PY  - 2012
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5272
AB  - There is a growing interest in utilization of abundantly available materials, bio-mass or industrial byproducts, as precursors for the preparation of carbon materials. Short hemp fibers, acquired as waste from textile production, were used as low-cost precursor for production of carbon materials as a sorbent in the solid-phase extraction, for pesticide analysis in water samples. Different carbon materials were prepared by carbonization of unmodified and chemically modified hemp fibers. Activation of carbonized materials with potassium hydroxide improves sorption properties of carbonized hemp fibers by increasing the specific surface area (up to 2192 m(2)/g) and the amount of surface oxygen groups. The following parameters that may affect the solid-phase extraction procedure efficiency were optimized: different elution solvents and the pH value of pesticide solution. Extracts were analyzed by liquid chromatography-tandem mass spectrometry technique. For this study pesticides belonging to the different chemical classes were chosen. Obtained results indicate that carbonized and activated hemp fibers could be successfully applied as a solid-phase sorbent for the pesticide analysis in water samples. (C) 2012 Elsevier B.V. All rights reserved.
T2  - Chemical Engineering Journal
T1  - Application of carbonized hemp fibers as a new solid-phase extraction sorbent for analysis of pesticides in water samples
VL  - 211
SP  - 224
EP  - 232
DO  - 10.1016/j.cej.2012.09.059
ER  - 

@article{
author = "Vukčević, Marija and Kalijadis, Ana and Radisic, Marina and Pejić, Biljana and Kostić, Mirjana M. and Laušević, Zoran and Laušević, Mila D.",
year = "2012",
abstract = "There is a growing interest in utilization of abundantly available materials, bio-mass or industrial byproducts, as precursors for the preparation of carbon materials. Short hemp fibers, acquired as waste from textile production, were used as low-cost precursor for production of carbon materials as a sorbent in the solid-phase extraction, for pesticide analysis in water samples. Different carbon materials were prepared by carbonization of unmodified and chemically modified hemp fibers. Activation of carbonized materials with potassium hydroxide improves sorption properties of carbonized hemp fibers by increasing the specific surface area (up to 2192 m(2)/g) and the amount of surface oxygen groups. The following parameters that may affect the solid-phase extraction procedure efficiency were optimized: different elution solvents and the pH value of pesticide solution. Extracts were analyzed by liquid chromatography-tandem mass spectrometry technique. For this study pesticides belonging to the different chemical classes were chosen. Obtained results indicate that carbonized and activated hemp fibers could be successfully applied as a solid-phase sorbent for the pesticide analysis in water samples. (C) 2012 Elsevier B.V. All rights reserved.",
journal = "Chemical Engineering Journal",
title = "Application of carbonized hemp fibers as a new solid-phase extraction sorbent for analysis of pesticides in water samples",
volume = "211",
pages = "224-232",
doi = "10.1016/j.cej.2012.09.059"
}

Vukčević, M., Kalijadis, A., Radisic, M., Pejić, B., Kostić, M. M., Laušević, Z.,& Laušević, M. D.. (2012). Application of carbonized hemp fibers as a new solid-phase extraction sorbent for analysis of pesticides in water samples. in Chemical Engineering Journal, 211, 224-232.
https://doi.org/10.1016/j.cej.2012.09.059

Vukčević M, Kalijadis A, Radisic M, Pejić B, Kostić MM, Laušević Z, Laušević MD. Application of carbonized hemp fibers as a new solid-phase extraction sorbent for analysis of pesticides in water samples. in Chemical Engineering Journal. 2012;211:224-232.
doi:10.1016/j.cej.2012.09.059 .

Vukčević, Marija, Kalijadis, Ana, Radisic, Marina, Pejić, Biljana, Kostić, Mirjana M., Laušević, Zoran, Laušević, Mila D., "Application of carbonized hemp fibers as a new solid-phase extraction sorbent for analysis of pesticides in water samples" in Chemical Engineering Journal, 211 (2012):224-232,
https://doi.org/10.1016/j.cej.2012.09.059 . .