TY  - JOUR
AU  - Stanković, S.
AU  - Šoštarić, Tatjana
AU  - Bugarčić, Mladen
AU  - Janićijević, A.
AU  - Pantović-Spajić, Katarina
AU  - Lopičić, Zorica
PY  - 2019
UR  - https://ritnms.itnms.ac.rs/handle/123456789/514
AB  - Annual production of the sunflower seed in Serbia is between 650,000-720,000 tons. Most of this amount is used in vegetable oil industry. Abundant by-products from this processing are sunflower seed husks. Husks are usually incinerated by vegetable oil producers in order to obtain energy, used as an animal feed, or, unfortunately, landed up at some landfills. In order to promote new, added value for this abundant, renewable resource, the investigation presented in this paper was conducted. For that purpose, adsorption of Cu(II) ions from synthetic solution by unmodified sunflower seed husks was examined. ATR-FTIR was used to identify functional groups as potential active sites for Cu(II) sorption. Zeta potential values were determined to reveal the surface charge, while the cation exchange capacity (CEC) was determined to reveal the amount of exchangeable ions on its surface. ATR-FTIR analysis revealed the presence of specific functional groups (hydroxyl, carboxyl, carbonyl, and amine) responsible for removal of Cu(II) ions. The total CEC of sunflower husk is 47.74 meq/100g and Ca(II) and Mg(II) ions are in dominant exchangeable positions. The study of ion-exchange mechanism involvement was done and results confirmed that this mechanism is not the only mechanism which is involved in copper sorption. Also, the results show that the Cu(II) ions have preference for Mg(II) ions substitution. Sorption experiments were conducted in batch system. The effect of operating parameters (pH, contact time, initial concentration of Cu(II) ions and adsorbent dosage) on the adsorption capacity were investigated. The obtained experimental data were fitted by Langmuir and Freundlich isotherm models. The maximum adsorption capacity for Cu(II) ions calculated from Langmuir adsorption isotherm was 34.89 mg/g which is 15 to 35% higher than the capacity that other researchers reported previously for the same material and pollutant. These results are suggesting that sunflower seed husks have a potential to be applied as an effective adsorbent of copper ions from contaminated waters.
PB  - Univerzitet u Novom Sadu - Tehnološki fakultet, Novi Sad
T2  - Acta Periodica Technologica
T1  - Adsorption of Cu(II) ions from synthetic solution by sunflower seed husks
EP  - 277
SP  - 268
VL  - 50
DO  - 10.2298/APT1950268S
UR  - conv_1024
ER  - 

@article{
author = "Stanković, S. and Šoštarić, Tatjana and Bugarčić, Mladen and Janićijević, A. and Pantović-Spajić, Katarina and Lopičić, Zorica",
year = "2019",
abstract = "Annual production of the sunflower seed in Serbia is between 650,000-720,000 tons. Most of this amount is used in vegetable oil industry. Abundant by-products from this processing are sunflower seed husks. Husks are usually incinerated by vegetable oil producers in order to obtain energy, used as an animal feed, or, unfortunately, landed up at some landfills. In order to promote new, added value for this abundant, renewable resource, the investigation presented in this paper was conducted. For that purpose, adsorption of Cu(II) ions from synthetic solution by unmodified sunflower seed husks was examined. ATR-FTIR was used to identify functional groups as potential active sites for Cu(II) sorption. Zeta potential values were determined to reveal the surface charge, while the cation exchange capacity (CEC) was determined to reveal the amount of exchangeable ions on its surface. ATR-FTIR analysis revealed the presence of specific functional groups (hydroxyl, carboxyl, carbonyl, and amine) responsible for removal of Cu(II) ions. The total CEC of sunflower husk is 47.74 meq/100g and Ca(II) and Mg(II) ions are in dominant exchangeable positions. The study of ion-exchange mechanism involvement was done and results confirmed that this mechanism is not the only mechanism which is involved in copper sorption. Also, the results show that the Cu(II) ions have preference for Mg(II) ions substitution. Sorption experiments were conducted in batch system. The effect of operating parameters (pH, contact time, initial concentration of Cu(II) ions and adsorbent dosage) on the adsorption capacity were investigated. The obtained experimental data were fitted by Langmuir and Freundlich isotherm models. The maximum adsorption capacity for Cu(II) ions calculated from Langmuir adsorption isotherm was 34.89 mg/g which is 15 to 35% higher than the capacity that other researchers reported previously for the same material and pollutant. These results are suggesting that sunflower seed husks have a potential to be applied as an effective adsorbent of copper ions from contaminated waters.",
publisher = "Univerzitet u Novom Sadu - Tehnološki fakultet, Novi Sad",
journal = "Acta Periodica Technologica",
title = "Adsorption of Cu(II) ions from synthetic solution by sunflower seed husks",
pages = "277-268",
volume = "50",
doi = "10.2298/APT1950268S",
url = "conv_1024"
}

Stanković, S., Šoštarić, T., Bugarčić, M., Janićijević, A., Pantović-Spajić, K.,& Lopičić, Z.. (2019). Adsorption of Cu(II) ions from synthetic solution by sunflower seed husks. in Acta Periodica Technologica
Univerzitet u Novom Sadu - Tehnološki fakultet, Novi Sad., 50, 268-277.
https://doi.org/10.2298/APT1950268S
conv_1024

Stanković S, Šoštarić T, Bugarčić M, Janićijević A, Pantović-Spajić K, Lopičić Z. Adsorption of Cu(II) ions from synthetic solution by sunflower seed husks. in Acta Periodica Technologica. 2019;50:268-277.
doi:10.2298/APT1950268S
conv_1024 .

Stanković, S., Šoštarić, Tatjana, Bugarčić, Mladen, Janićijević, A., Pantović-Spajić, Katarina, Lopičić, Zorica, "Adsorption of Cu(II) ions from synthetic solution by sunflower seed husks" in Acta Periodica Technologica, 50 (2019):268-277,
https://doi.org/10.2298/APT1950268S .,
conv_1024 .

TY  - JOUR
AU  - Sokić, Miroslav
AU  - Marković, Branislav
AU  - Pezo, Lato
AU  - Stanković, S.B.
AU  - Patarić, Aleksandra
AU  - Janjušević, Zoran
AU  - Lončar, B.Lj.
PY  - 2019
UR  - https://ritnms.itnms.ac.rs/handle/123456789/512
AB  - Hydrometallurgical processing of the copper concentrates is a promising alternative to the conventional pyrometallurgical production of copper due to significantly lower environmental impact, capital and operational costs. Development of the hydrometallurgical process for copper recovery from mineral concentrate requires extensive work in testing and optimization of operational parameters from laboratory to semi-industrial scale. Mathematical modelling of the copper leaching process can save human labour and time. Leaching of copper from chalcopyrite concentrate using sulphuric acid and sodium nitrate as an oxidant was tested, and the influence of temperature, particle size, stirring speed and concentrations of sulphuric acid and sodium nitrate were evaluated. Obtained results showed that increasing temperature and concentrations of sulphuric acid and sodium nitrate increase the leaching degree of copper, while increasing particle size and stirring speed reduce copper extraction. In this paper, second-order polynomial models (SOP) were applied to experimental data. Presented results show that mathematical models fit experimental data. The conclusion is that SOP models are a promising tool to be used for modelling leaching processes of metals.
PB  - Bulgarian Academy of Sciences
T2  - Bulgarian Chemical Communications
T1  - Copper leaching from chalcopyrite concentrate by sodium nitrate in sulphuric acid solution – chemometric approach
EP  - 463
IS  - 3
SP  - 457
VL  - 51
DO  - 10.34049/bcc.51.3.5119
UR  - conv_1022
ER  - 

@article{
author = "Sokić, Miroslav and Marković, Branislav and Pezo, Lato and Stanković, S.B. and Patarić, Aleksandra and Janjušević, Zoran and Lončar, B.Lj.",
year = "2019",
abstract = "Hydrometallurgical processing of the copper concentrates is a promising alternative to the conventional pyrometallurgical production of copper due to significantly lower environmental impact, capital and operational costs. Development of the hydrometallurgical process for copper recovery from mineral concentrate requires extensive work in testing and optimization of operational parameters from laboratory to semi-industrial scale. Mathematical modelling of the copper leaching process can save human labour and time. Leaching of copper from chalcopyrite concentrate using sulphuric acid and sodium nitrate as an oxidant was tested, and the influence of temperature, particle size, stirring speed and concentrations of sulphuric acid and sodium nitrate were evaluated. Obtained results showed that increasing temperature and concentrations of sulphuric acid and sodium nitrate increase the leaching degree of copper, while increasing particle size and stirring speed reduce copper extraction. In this paper, second-order polynomial models (SOP) were applied to experimental data. Presented results show that mathematical models fit experimental data. The conclusion is that SOP models are a promising tool to be used for modelling leaching processes of metals.",
publisher = "Bulgarian Academy of Sciences",
journal = "Bulgarian Chemical Communications",
title = "Copper leaching from chalcopyrite concentrate by sodium nitrate in sulphuric acid solution – chemometric approach",
pages = "463-457",
number = "3",
volume = "51",
doi = "10.34049/bcc.51.3.5119",
url = "conv_1022"
}

Sokić, M., Marković, B., Pezo, L., Stanković, S.B., Patarić, A., Janjušević, Z.,& Lončar, B.Lj.. (2019). Copper leaching from chalcopyrite concentrate by sodium nitrate in sulphuric acid solution – chemometric approach. in Bulgarian Chemical Communications
Bulgarian Academy of Sciences., 51(3), 457-463.
https://doi.org/10.34049/bcc.51.3.5119
conv_1022

Sokić M, Marković B, Pezo L, Stanković S, Patarić A, Janjušević Z, Lončar B. Copper leaching from chalcopyrite concentrate by sodium nitrate in sulphuric acid solution – chemometric approach. in Bulgarian Chemical Communications. 2019;51(3):457-463.
doi:10.34049/bcc.51.3.5119
conv_1022 .

Sokić, Miroslav, Marković, Branislav, Pezo, Lato, Stanković, S.B., Patarić, Aleksandra, Janjušević, Zoran, Lončar, B.Lj., "Copper leaching from chalcopyrite concentrate by sodium nitrate in sulphuric acid solution – chemometric approach" in Bulgarian Chemical Communications, 51, no. 3 (2019):457-463,
https://doi.org/10.34049/bcc.51.3.5119 .,
conv_1022 .