TY  - JOUR
AU  - Kragović, Milan
AU  - Daković, Aleksandra
AU  - Marković, Marija
AU  - Krstić, Jugoslav
AU  - Gatta, G. Diego
AU  - Rotiroti, Nicola
PY  - 2013
UR  - https://ritnms.itnms.ac.rs/handle/123456789/259
AB  - The influence of contact time, temperature and particle size on lead sorption by the natural and Fe(III)-modified zeolites was investigated. Characterization of the natural and Fe(III)-modified zeolite before and after lead sorption was performed by determination of textural properties, by scanning electron microscopy and X-ray spectroscopy in energy-dispersive mode (SEM-EDS), transmission electron microscopy (TEM) and X-ray powder diffraction (XRPD) analysis. Lead sorption kinetics at 303-333 K, best represented by the pseudo-second order model and activation energy (13.5 and 8.5 kJ/mol for the natural and Fe(III)-modified zeolite respectively) confirmed an activated chemical sorption. Desorption experiments indicated that lead was irreversibly sorbed on both zeolites. XRPD, TEM and SEM results showed that modification of the natural zeolite with Fe(III) ions did not change its crystal structure and iron is mainly located at the zeolite surface, likely in form of amorphous iron oxy-hydroxides. Specific surface area significantly increases after modification of the natural zeolite with Fe(III) ions (from 30.2 for the natural to 52.5 m(2)/g for Fe(III)-modified zeolite). Characterization of both lead saturated sorbents suggested that besides ion exchange, lead is both chemisorbed and precipitated at their surfaces, and presence of amorphous iron in Fe(III)-modified zeolite favors sorption of lead.
PB  - Elsevier, Amsterdam
T2  - Applied Surface Science
T1  - Characterization of lead sorption by the natural and Fe(III)-modified zeolite
EP  - 774
SP  - 764
VL  - 283
DO  - 10.1016/j.apsusc.2013.07.016
UR  - conv_664
ER  - 

@article{
author = "Kragović, Milan and Daković, Aleksandra and Marković, Marija and Krstić, Jugoslav and Gatta, G. Diego and Rotiroti, Nicola",
year = "2013",
abstract = "The influence of contact time, temperature and particle size on lead sorption by the natural and Fe(III)-modified zeolites was investigated. Characterization of the natural and Fe(III)-modified zeolite before and after lead sorption was performed by determination of textural properties, by scanning electron microscopy and X-ray spectroscopy in energy-dispersive mode (SEM-EDS), transmission electron microscopy (TEM) and X-ray powder diffraction (XRPD) analysis. Lead sorption kinetics at 303-333 K, best represented by the pseudo-second order model and activation energy (13.5 and 8.5 kJ/mol for the natural and Fe(III)-modified zeolite respectively) confirmed an activated chemical sorption. Desorption experiments indicated that lead was irreversibly sorbed on both zeolites. XRPD, TEM and SEM results showed that modification of the natural zeolite with Fe(III) ions did not change its crystal structure and iron is mainly located at the zeolite surface, likely in form of amorphous iron oxy-hydroxides. Specific surface area significantly increases after modification of the natural zeolite with Fe(III) ions (from 30.2 for the natural to 52.5 m(2)/g for Fe(III)-modified zeolite). Characterization of both lead saturated sorbents suggested that besides ion exchange, lead is both chemisorbed and precipitated at their surfaces, and presence of amorphous iron in Fe(III)-modified zeolite favors sorption of lead.",
publisher = "Elsevier, Amsterdam",
journal = "Applied Surface Science",
title = "Characterization of lead sorption by the natural and Fe(III)-modified zeolite",
pages = "774-764",
volume = "283",
doi = "10.1016/j.apsusc.2013.07.016",
url = "conv_664"
}

Kragović, M., Daković, A., Marković, M., Krstić, J., Gatta, G. D.,& Rotiroti, N.. (2013). Characterization of lead sorption by the natural and Fe(III)-modified zeolite. in Applied Surface Science
Elsevier, Amsterdam., 283, 764-774.
https://doi.org/10.1016/j.apsusc.2013.07.016
conv_664

Kragović M, Daković A, Marković M, Krstić J, Gatta GD, Rotiroti N. Characterization of lead sorption by the natural and Fe(III)-modified zeolite. in Applied Surface Science. 2013;283:764-774.
doi:10.1016/j.apsusc.2013.07.016
conv_664 .

Kragović, Milan, Daković, Aleksandra, Marković, Marija, Krstić, Jugoslav, Gatta, G. Diego, Rotiroti, Nicola, "Characterization of lead sorption by the natural and Fe(III)-modified zeolite" in Applied Surface Science, 283 (2013):764-774,
https://doi.org/10.1016/j.apsusc.2013.07.016 .,
conv_664 .

TY  - JOUR
AU  - Kragović, Milan
AU  - Daković, Aleksandra
AU  - Sekulić, Živko
AU  - Trgo, Marina
AU  - Ugrina, Marin
AU  - Perić, Jelena
AU  - Gatta, G. Diego
PY  - 2012
UR  - https://ritnms.itnms.ac.rs/handle/123456789/204
AB  - In the present study, the sorption of lead by the natural and Fe(III)-modified zeolite (clinoptilolite) is described. The characterization of the natural zeolite-rich rock and the Fe(III)-modified form was performed by chemical analysis, point of the zero charge (pHpzc), X-ray powder diffraction, applying the Rietveld/RIR method for the quantitative phase analysis, and scanning electron microscopy. The effects of sorbents dose and the initial lead concentrations on its sorption by two sorbents were investigated. For both sorbents, it was determined that at lower initial concentrations of lead, ion exchange of inorganic cations in zeolites with lead, together with uptake of hydrogen dominated, while at higher initial lead concentrations beside these processes, chemisorption of lead occurred. Significantly higher sorption of lead was achieved with Fe(III)-modified zeolite. From sorption isotherms, maximum sorbed amounts of lead, under the applied experimental conditions, were 66 mg/g for the natural and 133 mg/g for Fe(III)modified zeolite. The best fit of experimental data was achieved with the Freundlich model (R-2 >= 0.94).
PB  - Elsevier, Amsterdam
T2  - Applied Surface Science
T1  - Removal of lead from aqueous solutions by using the natural and Fe(III)-modified zeolite
EP  - 3673
IS  - 8
SP  - 3667
VL  - 258
DO  - 10.1016/j.apsusc.2011.12.002
UR  - conv_609
ER  - 

@article{
author = "Kragović, Milan and Daković, Aleksandra and Sekulić, Živko and Trgo, Marina and Ugrina, Marin and Perić, Jelena and Gatta, G. Diego",
year = "2012",
abstract = "In the present study, the sorption of lead by the natural and Fe(III)-modified zeolite (clinoptilolite) is described. The characterization of the natural zeolite-rich rock and the Fe(III)-modified form was performed by chemical analysis, point of the zero charge (pHpzc), X-ray powder diffraction, applying the Rietveld/RIR method for the quantitative phase analysis, and scanning electron microscopy. The effects of sorbents dose and the initial lead concentrations on its sorption by two sorbents were investigated. For both sorbents, it was determined that at lower initial concentrations of lead, ion exchange of inorganic cations in zeolites with lead, together with uptake of hydrogen dominated, while at higher initial lead concentrations beside these processes, chemisorption of lead occurred. Significantly higher sorption of lead was achieved with Fe(III)-modified zeolite. From sorption isotherms, maximum sorbed amounts of lead, under the applied experimental conditions, were 66 mg/g for the natural and 133 mg/g for Fe(III)modified zeolite. The best fit of experimental data was achieved with the Freundlich model (R-2 >= 0.94).",
publisher = "Elsevier, Amsterdam",
journal = "Applied Surface Science",
title = "Removal of lead from aqueous solutions by using the natural and Fe(III)-modified zeolite",
pages = "3673-3667",
number = "8",
volume = "258",
doi = "10.1016/j.apsusc.2011.12.002",
url = "conv_609"
}

Kragović, M., Daković, A., Sekulić, Ž., Trgo, M., Ugrina, M., Perić, J.,& Gatta, G. D.. (2012). Removal of lead from aqueous solutions by using the natural and Fe(III)-modified zeolite. in Applied Surface Science
Elsevier, Amsterdam., 258(8), 3667-3673.
https://doi.org/10.1016/j.apsusc.2011.12.002
conv_609

Kragović M, Daković A, Sekulić Ž, Trgo M, Ugrina M, Perić J, Gatta GD. Removal of lead from aqueous solutions by using the natural and Fe(III)-modified zeolite. in Applied Surface Science. 2012;258(8):3667-3673.
doi:10.1016/j.apsusc.2011.12.002
conv_609 .

Kragović, Milan, Daković, Aleksandra, Sekulić, Živko, Trgo, Marina, Ugrina, Marin, Perić, Jelena, Gatta, G. Diego, "Removal of lead from aqueous solutions by using the natural and Fe(III)-modified zeolite" in Applied Surface Science, 258, no. 8 (2012):3667-3673,
https://doi.org/10.1016/j.apsusc.2011.12.002 .,
conv_609 .