TY  - JOUR
AU  - Petrović, Jelena
AU  - Perišić, Nebojša
AU  - Dragišić-Maksimović, Jelena
AU  - Maksimović, Vuk
AU  - Kragović, Milan
AU  - Stojanović, Mirjana
AU  - Laušević, Mila
AU  - Mihajlović, Marija
PY  - 2016
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5829
AB  - In this study, carbonization products of grape pomace (hydrochar and process water) have been thoroughly characterized in order to assess its fuel properties, physico-chemical composition and to optimize its production. The obtained detailed insight into transformations of the biomass during hydrothermal conversion between 180-220 degrees C revealed that the hydrochar obtained at 220 degrees C exhibits a considerable energetic potential, increased porosity and re-adsorption abbility. Hydrothermally induced structural changes in the obtained hydrochars were unveiled by thermal and morphology analysis, FTIR and NIR spectroscopy. Temperature increment caused a decrease in antioxidative capacity, anthocyanin and organic acid content in process water and simultaneous increase in total phenolic and individual organic components content. The overall effect of the reaction temperature on products characteristics was assessed by multivariate data analysis. Obtained results substantiated the suitability of hydrothermal conversion of grape pomace into highly valuable fuels and versatile products.
PB  - Elsevier Science Bv, Amsterdam
T2  - Journal of Analytical and Applied Pyrolysis
T1  - Hydrothermal conversion of grape pomace: Detailed characterization of obtained hydrochar and liquid phase
EP  - 277
SP  - 267
VL  - 118
DO  - 10.1016/j.jaap.2016.02.010
ER  - 

@article{
author = "Petrović, Jelena and Perišić, Nebojša and Dragišić-Maksimović, Jelena and Maksimović, Vuk and Kragović, Milan and Stojanović, Mirjana and Laušević, Mila and Mihajlović, Marija",
year = "2016",
abstract = "In this study, carbonization products of grape pomace (hydrochar and process water) have been thoroughly characterized in order to assess its fuel properties, physico-chemical composition and to optimize its production. The obtained detailed insight into transformations of the biomass during hydrothermal conversion between 180-220 degrees C revealed that the hydrochar obtained at 220 degrees C exhibits a considerable energetic potential, increased porosity and re-adsorption abbility. Hydrothermally induced structural changes in the obtained hydrochars were unveiled by thermal and morphology analysis, FTIR and NIR spectroscopy. Temperature increment caused a decrease in antioxidative capacity, anthocyanin and organic acid content in process water and simultaneous increase in total phenolic and individual organic components content. The overall effect of the reaction temperature on products characteristics was assessed by multivariate data analysis. Obtained results substantiated the suitability of hydrothermal conversion of grape pomace into highly valuable fuels and versatile products.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "Journal of Analytical and Applied Pyrolysis",
title = "Hydrothermal conversion of grape pomace: Detailed characterization of obtained hydrochar and liquid phase",
pages = "277-267",
volume = "118",
doi = "10.1016/j.jaap.2016.02.010"
}

Petrović, J., Perišić, N., Dragišić-Maksimović, J., Maksimović, V., Kragović, M., Stojanović, M., Laušević, M.,& Mihajlović, M.. (2016). Hydrothermal conversion of grape pomace: Detailed characterization of obtained hydrochar and liquid phase. in Journal of Analytical and Applied Pyrolysis
Elsevier Science Bv, Amsterdam., 118, 267-277.
https://doi.org/10.1016/j.jaap.2016.02.010

Petrović J, Perišić N, Dragišić-Maksimović J, Maksimović V, Kragović M, Stojanović M, Laušević M, Mihajlović M. Hydrothermal conversion of grape pomace: Detailed characterization of obtained hydrochar and liquid phase. in Journal of Analytical and Applied Pyrolysis. 2016;118:267-277.
doi:10.1016/j.jaap.2016.02.010 .

Petrović, Jelena, Perišić, Nebojša, Dragišić-Maksimović, Jelena, Maksimović, Vuk, Kragović, Milan, Stojanović, Mirjana, Laušević, Mila, Mihajlović, Marija, "Hydrothermal conversion of grape pomace: Detailed characterization of obtained hydrochar and liquid phase" in Journal of Analytical and Applied Pyrolysis, 118 (2016):267-277,
https://doi.org/10.1016/j.jaap.2016.02.010 . .

TY  - JOUR
AU  - Mihajlović, Marija T.
AU  - Lazarević, Slavica
AU  - Janković-Častvan, Ivona
AU  - Kovač, Janez
AU  - Jokić, Bojan
AU  - Janaćković, Đorđe
AU  - Petrović, Rada
PY  - 2015
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3035
AB  - The adsorption of Pb2+, Cd2+, and Zn2+ from equimolar multicomponent solutions onto natural and Fe(III)-modified zeolites was studied by batch experiments in order to determine the influence of the competitive effect on the efficiency ions removal at different initial concentrations and different temperatures. Kinetic and equilibrium studies showed that affinity of both zeolites was the highest for Pb2+ and much lower for Zn2+ and Cd2+. The competitive effect was negligible at lower concentrations, while Zn2+ and especially Cd2+ ions adsorption was suppressed as the concentrations were increased. Affinity of natural zeolite toward the ions was lower than that of the modified zeolite, as was shown for adsorption from single-component solutions. External film diffusion was the rate-controlling step at lower concentrations and for ions of higher affinity for the adsorbent, while intraparticle diffusion was dominant at higher concentrations and for ions of lower affinity for the adsorbent. The increasing spontaneity of the adsorption process with increasing temperature and the positive values of enthalpy of adsorption indicated the endothermic nature of the adsorption process. Structural investigations of the adsorbents loaded with Pb2+, Cd2+, and Zn2+ ions by X-ray photoelectron spectroscopy (XPS) confirmed the higher content of the ions in the surface and subsurface regions of the Fe(III)-modified than of the natural zeolite. XPS depth profiles of the loaded Fe(III)-modified zeolite showed that surface mechanisms of adsorption were dominant in the case of lead and cadmium, while zinc loading on the zeolite sample was governed mainly by an ion-exchange process.
PB  - Springer, New York
T2  - Clean Technologies and Environmental Policy
T1  - Kinetics, thermodynamics, and structural investigations on the removal of Pb2+, Cd2+, and Zn2+ from multicomponent solutions onto natural and Fe(III)-modified zeolites
EP  - 419
IS  - 2
SP  - 407
VL  - 17
DO  - 10.1007/s10098-014-0794-8
ER  - 

@article{
author = "Mihajlović, Marija T. and Lazarević, Slavica and Janković-Častvan, Ivona and Kovač, Janez and Jokić, Bojan and Janaćković, Đorđe and Petrović, Rada",
year = "2015",
abstract = "The adsorption of Pb2+, Cd2+, and Zn2+ from equimolar multicomponent solutions onto natural and Fe(III)-modified zeolites was studied by batch experiments in order to determine the influence of the competitive effect on the efficiency ions removal at different initial concentrations and different temperatures. Kinetic and equilibrium studies showed that affinity of both zeolites was the highest for Pb2+ and much lower for Zn2+ and Cd2+. The competitive effect was negligible at lower concentrations, while Zn2+ and especially Cd2+ ions adsorption was suppressed as the concentrations were increased. Affinity of natural zeolite toward the ions was lower than that of the modified zeolite, as was shown for adsorption from single-component solutions. External film diffusion was the rate-controlling step at lower concentrations and for ions of higher affinity for the adsorbent, while intraparticle diffusion was dominant at higher concentrations and for ions of lower affinity for the adsorbent. The increasing spontaneity of the adsorption process with increasing temperature and the positive values of enthalpy of adsorption indicated the endothermic nature of the adsorption process. Structural investigations of the adsorbents loaded with Pb2+, Cd2+, and Zn2+ ions by X-ray photoelectron spectroscopy (XPS) confirmed the higher content of the ions in the surface and subsurface regions of the Fe(III)-modified than of the natural zeolite. XPS depth profiles of the loaded Fe(III)-modified zeolite showed that surface mechanisms of adsorption were dominant in the case of lead and cadmium, while zinc loading on the zeolite sample was governed mainly by an ion-exchange process.",
publisher = "Springer, New York",
journal = "Clean Technologies and Environmental Policy",
title = "Kinetics, thermodynamics, and structural investigations on the removal of Pb2+, Cd2+, and Zn2+ from multicomponent solutions onto natural and Fe(III)-modified zeolites",
pages = "419-407",
number = "2",
volume = "17",
doi = "10.1007/s10098-014-0794-8"
}

Mihajlović, M. T., Lazarević, S., Janković-Častvan, I., Kovač, J., Jokić, B., Janaćković, Đ.,& Petrović, R.. (2015). Kinetics, thermodynamics, and structural investigations on the removal of Pb2+, Cd2+, and Zn2+ from multicomponent solutions onto natural and Fe(III)-modified zeolites. in Clean Technologies and Environmental Policy
Springer, New York., 17(2), 407-419.
https://doi.org/10.1007/s10098-014-0794-8

Mihajlović MT, Lazarević S, Janković-Častvan I, Kovač J, Jokić B, Janaćković Đ, Petrović R. Kinetics, thermodynamics, and structural investigations on the removal of Pb2+, Cd2+, and Zn2+ from multicomponent solutions onto natural and Fe(III)-modified zeolites. in Clean Technologies and Environmental Policy. 2015;17(2):407-419.
doi:10.1007/s10098-014-0794-8 .

Mihajlović, Marija T., Lazarević, Slavica, Janković-Častvan, Ivona, Kovač, Janez, Jokić, Bojan, Janaćković, Đorđe, Petrović, Rada, "Kinetics, thermodynamics, and structural investigations on the removal of Pb2+, Cd2+, and Zn2+ from multicomponent solutions onto natural and Fe(III)-modified zeolites" in Clean Technologies and Environmental Policy, 17, no. 2 (2015):407-419,
https://doi.org/10.1007/s10098-014-0794-8 . .

TY  - JOUR
AU  - Mihajlović, Marija T.
AU  - Lazarević, Slavica
AU  - Janković-Častvan, Ivona
AU  - Jokić, Bojan
AU  - Janaćković, Đorđe
AU  - Petrović, Rada
PY  - 2014
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2636
AB  - The main purpose of this research was to explain the differences in the adsorption mechanisms and adsorption capacities of natural and Fe(III)-modified zeolite for Pb2+, Zn2+ and Cd2+. The adsorbents were characterized with respect to their phase composition, morphology, specific surface area, cation exchange capacity and point of zero charge. Batch adsorption experiments were performed as a function of the initial ion concentration and temperature, at constant initial pH value of 5.5±0.1. The adsorption isotherms at 25, 40, 55 and 70 °C suggest that the sequence of adsorption efficiency of both zeolites is Pb2+  gt  Zn2+  gt  Cd2+. The adsorption capacities of both zeolites increased with increasing temperature. The equilibrium adsorption data were best described by the Langmuir adsorption isotherm. This study revealed that the adsorption capacity of the Fe(III)-modified zeolite is much higher than that of natural zeolite for all investigated ions owing to the higher: specific adsorption caused by the new functional groups formed on the zeolite surface, ion exchange due to the presence of easily exchangeable ions, and hydroxide precipitation caused by higher point of zero charge of the Fe(III)-modified zeolite compared to natural zeolite.
AB  - U ovom radu je ispitivana adsorpcija Pb2+, Zn2+ i Cd2+ iz vodenih rastvora na prirodnom i Fe(III)-modifikovanom zeolitu u cilju objašnjenja uticaja modifikacije prirodnog zeolita hidratisanim gvožđe(III)-oksidom na mehanizam adsorpcije i adsorpcioni kapacitet. Karakterizacija adsorbenata je obuhvatila određivanje faznog sastava, morfologije, specifične površine, kapaciteta izmene katjona i tačke nultog naelektrisanja. Adsorpcioni eksperimenti su izvođeni u šaržnim uslovima, pri konstantnoj pH vrednosti od 5,5±0,1, pri različitim početnim koncentracijama jona i na različitim temperaturama. Adsorpcione izoterme određene na 25, 40, 55 i 70 °C pokazuju da je afinitet oba adsorbenta u svim slučajevima najveći za Pb2+, zatim za Zn2+ i najmanji za Cd2+. Adsorpcioni kapaciteti oba adsorbenta za sva tri jona rastu sa povišenjem temperature. Rezultati adsorpcije se najbolje opisuju Lengmirovom adsorpcionom izotermom. Rezultati ispitivanja su pokazali da je adsorpcioni kapacitet Fe(III)-zeolita za Pb2+, Zn2+ i Cd2+ znatno veći od kapaciteta prirodnog zeolita zahvaljujući: većoj specifičnoj adsorpciji zbog formiranja novih funkcionalnih grupa na površini zeolita, većoj jonskoj izmeni zbog prisustva jona koji se lakše izmenjuju i većoj precipitaciji hidroksida usled više tačke nultog naelektrisanja Fe(III)-zeolita.
PB  - Association of the Chemical Engineers of Serbia
T2  - Chemical Industry & Chemical Engineering Quarterly
T1  - A comparative study of the removal of lead, cadmium and zinc ions from aqueous solutions by natural and Fe(III)-modified zeolite
T1  - Uporedna analiza uklanjanja jona olova, kadmijuma i cinka iz vodenih rastvora adsorpcijom na prirodnom i Fe(III)- modifikovanom zeolitu
EP  - 293
IS  - 2
SP  - 283
VL  - 20
DO  - 10.2298/CICEQ121017010M
ER  - 

@article{
author = "Mihajlović, Marija T. and Lazarević, Slavica and Janković-Častvan, Ivona and Jokić, Bojan and Janaćković, Đorđe and Petrović, Rada",
year = "2014",
abstract = "The main purpose of this research was to explain the differences in the adsorption mechanisms and adsorption capacities of natural and Fe(III)-modified zeolite for Pb2+, Zn2+ and Cd2+. The adsorbents were characterized with respect to their phase composition, morphology, specific surface area, cation exchange capacity and point of zero charge. Batch adsorption experiments were performed as a function of the initial ion concentration and temperature, at constant initial pH value of 5.5±0.1. The adsorption isotherms at 25, 40, 55 and 70 °C suggest that the sequence of adsorption efficiency of both zeolites is Pb2+  gt  Zn2+  gt  Cd2+. The adsorption capacities of both zeolites increased with increasing temperature. The equilibrium adsorption data were best described by the Langmuir adsorption isotherm. This study revealed that the adsorption capacity of the Fe(III)-modified zeolite is much higher than that of natural zeolite for all investigated ions owing to the higher: specific adsorption caused by the new functional groups formed on the zeolite surface, ion exchange due to the presence of easily exchangeable ions, and hydroxide precipitation caused by higher point of zero charge of the Fe(III)-modified zeolite compared to natural zeolite., U ovom radu je ispitivana adsorpcija Pb2+, Zn2+ i Cd2+ iz vodenih rastvora na prirodnom i Fe(III)-modifikovanom zeolitu u cilju objašnjenja uticaja modifikacije prirodnog zeolita hidratisanim gvožđe(III)-oksidom na mehanizam adsorpcije i adsorpcioni kapacitet. Karakterizacija adsorbenata je obuhvatila određivanje faznog sastava, morfologije, specifične površine, kapaciteta izmene katjona i tačke nultog naelektrisanja. Adsorpcioni eksperimenti su izvođeni u šaržnim uslovima, pri konstantnoj pH vrednosti od 5,5±0,1, pri različitim početnim koncentracijama jona i na različitim temperaturama. Adsorpcione izoterme određene na 25, 40, 55 i 70 °C pokazuju da je afinitet oba adsorbenta u svim slučajevima najveći za Pb2+, zatim za Zn2+ i najmanji za Cd2+. Adsorpcioni kapaciteti oba adsorbenta za sva tri jona rastu sa povišenjem temperature. Rezultati adsorpcije se najbolje opisuju Lengmirovom adsorpcionom izotermom. Rezultati ispitivanja su pokazali da je adsorpcioni kapacitet Fe(III)-zeolita za Pb2+, Zn2+ i Cd2+ znatno veći od kapaciteta prirodnog zeolita zahvaljujući: većoj specifičnoj adsorpciji zbog formiranja novih funkcionalnih grupa na površini zeolita, većoj jonskoj izmeni zbog prisustva jona koji se lakše izmenjuju i većoj precipitaciji hidroksida usled više tačke nultog naelektrisanja Fe(III)-zeolita.",
publisher = "Association of the Chemical Engineers of Serbia",
journal = "Chemical Industry & Chemical Engineering Quarterly",
title = "A comparative study of the removal of lead, cadmium and zinc ions from aqueous solutions by natural and Fe(III)-modified zeolite, Uporedna analiza uklanjanja jona olova, kadmijuma i cinka iz vodenih rastvora adsorpcijom na prirodnom i Fe(III)- modifikovanom zeolitu",
pages = "293-283",
number = "2",
volume = "20",
doi = "10.2298/CICEQ121017010M"
}

Mihajlović, M. T., Lazarević, S., Janković-Častvan, I., Jokić, B., Janaćković, Đ.,& Petrović, R.. (2014). A comparative study of the removal of lead, cadmium and zinc ions from aqueous solutions by natural and Fe(III)-modified zeolite. in Chemical Industry & Chemical Engineering Quarterly
Association of the Chemical Engineers of Serbia., 20(2), 283-293.
https://doi.org/10.2298/CICEQ121017010M

Mihajlović MT, Lazarević S, Janković-Častvan I, Jokić B, Janaćković Đ, Petrović R. A comparative study of the removal of lead, cadmium and zinc ions from aqueous solutions by natural and Fe(III)-modified zeolite. in Chemical Industry & Chemical Engineering Quarterly. 2014;20(2):283-293.
doi:10.2298/CICEQ121017010M .

Mihajlović, Marija T., Lazarević, Slavica, Janković-Častvan, Ivona, Jokić, Bojan, Janaćković, Đorđe, Petrović, Rada, "A comparative study of the removal of lead, cadmium and zinc ions from aqueous solutions by natural and Fe(III)-modified zeolite" in Chemical Industry & Chemical Engineering Quarterly, 20, no. 2 (2014):283-293,
https://doi.org/10.2298/CICEQ121017010M . .