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The sorption of lead, cadmium and strontium from aqueous solutions on sepiolite

Sorpcija jona olova, kadmijuma i stroncijuma iz vodenih rastvora na sepiolitu

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0367-598X0602015L.pdf (430.6Kb)
Authors
Lazarević, Slavica
Janković-Častvan, Ivona
Ilić, Miloje M.
Jovanović, Dušan M.
Janaćković, Đorđe
Petrović, Rada
Article (Published version)
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Abstract
The results of the characterization and the sorption properties of sepiolite from the locality Slovići are presented in this paper. X-Ray diffraction analysis, infrared spectroscopy and differential thermal analysis revealed sepiolite as the main phase and small amounts of magnesite as an impurity. The specific surface area of sepiolite, determined by nitrogen adsorption and by applying the BET equation was found to be 339 m2/g. The point of zero charge was determined by the batch equilibration method, under different conditions, and the shift in the point of zero charge, in the presence of Pb2+, Cd2+ and Sr2+ ions, was investigated. It was determined that the point of zero charge changed with modification of the solid/liquid ratio and by washing the powder, which indicated that under the investigated conditions some dissolution of the sepiolite and impurities took place also influencing the position of the point of zero charge. In the presence of Pb2+, Cd2+ and Sr2"1" ions, the point ...of zero charge was shifted toward lower pH values denoting specific ion sorption. The greatest shift and, therefore the largest specific sorption, appeared in the case of Pb2+ ions, somewhat less with Cd2+, and the least with Sr2"1" ions. The adsorption isotherms were determined for the Pb2+, Cd2+ and Sr2+ ions, as well as the amounts of these ions that were removed from aqueous media by the ion exchange of Mg2+ ions from the sepiolite structure, depending on the equilibrium ion concentrations. In the case of ion exchange, as in the case of specific sorption, the affinity of sepiolite for the investigated ions can be presented in the following order Pb2+ gt Cd2+ gt Sr2"1". For the removal of Sr2"1" ions from aqueous media by sepiolite, a third mechanism is important probably, the ion exchange of exchangeable ions from the sepiolite structure channels. As the result of the action of all the sorption mechanisms sepiolite is removes mostly Pb2+ ions, then Cd2+ and least of all Sr2"1" ions from the aqueous media.

U radu su prikazani rezultati karakterizacije i određivanja sorpcionih svojstava sepiolita sa lokaliteta Slovići. Određena je tačka nultog naelektrisanja sepiolita pri različitim uslovima i ispitano pomeranje tačke nultog naelektrisanja u prisustvu jona Pb2+, CcF+ I Sr2+. Utvrđeno je da se tačka nultog naelektrisanja menja sa promenom odnosa čvrsto/tečno i ispiranjem praha. U prisustvu jona Pb2+, Cd2+ i Sr2+, tačka nultog naelektrisanja se pomera ka nižim pH vrednostima, što ukazuje na specifičnu sorpciju jona. Određene su adsorpcione izoterme za jone Pb2+, Cd2+ i Sr2+ i količine ovih jona koji se jonski izmenjuju sa Mg2+ jonima iz strukture sepiolita u zavisnosti od ravnotežne koncentracije jona. Najveći afinitet sepiolit ima prema jonima Pb2+, nešto manji prema jonima Cd i najmanji za Sr2+ jone, kako u slučaju specifične sorpcije tako i u slučaju jonske izmene Mg2+ jona iz strukture sepiolita.
Keywords:
sepiolite / point of zero charge / specific sorption / ionic exchange / adsorption isotherm / metal Ions / sepiolit / tačka nultog naelektrisanja / specifična sorpcija / jonska izmena / adsorpciona izoterma / joni metala
Source:
Hemijska industrija, 2006, 60, 1-2, 15-22
Publisher:
  • Association of Chemical Engineers of Serbia

DOI: 10.2298/HEMIND0602015L

ISSN: 0367-598X

[ Google Scholar ]
URI
http://TechnoRep.tmf.bg.ac.rs/handle/123456789/964
Collections
  • Radovi istraživača / Researchers’ publications (TMF)
Institution/Community
Tehnološko-metalurški fakultet
TY  - JOUR
AU  - Lazarević, Slavica
AU  - Janković-Častvan, Ivona
AU  - Ilić, Miloje M.
AU  - Jovanović, Dušan M.
AU  - Janaćković, Đorđe
AU  - Petrović, Rada
PY  - 2006
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/964
AB  - The results of the characterization and the sorption properties of sepiolite from the locality Slovići are presented in this paper. X-Ray diffraction analysis, infrared spectroscopy and differential thermal analysis revealed sepiolite as the main phase and small amounts of magnesite as an impurity. The specific surface area of sepiolite, determined by nitrogen adsorption and by applying the BET equation was found to be 339 m2/g. The point of zero charge was determined by the batch equilibration method, under different conditions, and the shift in the point of zero charge, in the presence of Pb2+, Cd2+ and Sr2+ ions, was investigated. It was determined that the point of zero charge changed with modification of the solid/liquid ratio and by washing the powder, which indicated that under the investigated conditions some dissolution of the sepiolite and impurities took place also influencing the position of the point of zero charge. In the presence of Pb2+, Cd2+ and Sr2"1" ions, the point of zero charge was shifted toward lower pH values denoting specific ion sorption. The greatest shift and, therefore the largest specific sorption, appeared in the case of Pb2+ ions, somewhat less with Cd2+, and the least with Sr2"1" ions. The adsorption isotherms were determined for the Pb2+, Cd2+ and Sr2+ ions, as well as the amounts of these ions that were removed from aqueous media by the ion exchange of Mg2+ ions from the sepiolite structure, depending on the equilibrium ion concentrations. In the case of ion exchange, as in the case of specific sorption, the affinity of sepiolite for the investigated ions can be presented in the following order Pb2+  gt  Cd2+  gt  Sr2"1". For the removal of Sr2"1" ions from aqueous media by sepiolite, a third mechanism is important probably, the ion exchange of exchangeable ions from the sepiolite structure channels. As the result of the action of all the sorption mechanisms sepiolite is removes mostly Pb2+ ions, then Cd2+ and least of all Sr2"1" ions from the aqueous media.
AB  - U radu su prikazani rezultati karakterizacije i određivanja sorpcionih svojstava sepiolita sa lokaliteta Slovići. Određena je tačka nultog naelektrisanja sepiolita pri različitim uslovima i ispitano pomeranje tačke nultog naelektrisanja u prisustvu jona Pb2+, CcF+ I Sr2+. Utvrđeno je da se tačka nultog naelektrisanja menja sa promenom odnosa čvrsto/tečno i ispiranjem praha. U prisustvu jona Pb2+, Cd2+ i Sr2+, tačka nultog naelektrisanja se pomera ka nižim pH vrednostima, što ukazuje na specifičnu sorpciju jona. Određene su adsorpcione izoterme za jone Pb2+, Cd2+ i Sr2+ i količine ovih jona koji se jonski izmenjuju sa Mg2+ jonima iz strukture sepiolita u zavisnosti od ravnotežne koncentracije jona. Najveći afinitet sepiolit ima prema jonima Pb2+, nešto manji prema jonima Cd i najmanji za Sr2+ jone, kako u slučaju specifične sorpcije tako i u slučaju jonske izmene Mg2+ jona iz strukture sepiolita.
PB  - Association of Chemical Engineers of Serbia
T2  - Hemijska industrija
T1  - The sorption of lead, cadmium and strontium from aqueous solutions on sepiolite
T1  - Sorpcija jona olova, kadmijuma i stroncijuma iz vodenih rastvora na sepiolitu
EP  - 22
IS  - 1-2
SP  - 15
VL  - 60
DO  - 10.2298/HEMIND0602015L
ER  - 
@article{
author = "Lazarević, Slavica and Janković-Častvan, Ivona and Ilić, Miloje M. and Jovanović, Dušan M. and Janaćković, Đorđe and Petrović, Rada",
year = "2006",
abstract = "The results of the characterization and the sorption properties of sepiolite from the locality Slovići are presented in this paper. X-Ray diffraction analysis, infrared spectroscopy and differential thermal analysis revealed sepiolite as the main phase and small amounts of magnesite as an impurity. The specific surface area of sepiolite, determined by nitrogen adsorption and by applying the BET equation was found to be 339 m2/g. The point of zero charge was determined by the batch equilibration method, under different conditions, and the shift in the point of zero charge, in the presence of Pb2+, Cd2+ and Sr2+ ions, was investigated. It was determined that the point of zero charge changed with modification of the solid/liquid ratio and by washing the powder, which indicated that under the investigated conditions some dissolution of the sepiolite and impurities took place also influencing the position of the point of zero charge. In the presence of Pb2+, Cd2+ and Sr2"1" ions, the point of zero charge was shifted toward lower pH values denoting specific ion sorption. The greatest shift and, therefore the largest specific sorption, appeared in the case of Pb2+ ions, somewhat less with Cd2+, and the least with Sr2"1" ions. The adsorption isotherms were determined for the Pb2+, Cd2+ and Sr2+ ions, as well as the amounts of these ions that were removed from aqueous media by the ion exchange of Mg2+ ions from the sepiolite structure, depending on the equilibrium ion concentrations. In the case of ion exchange, as in the case of specific sorption, the affinity of sepiolite for the investigated ions can be presented in the following order Pb2+  gt  Cd2+  gt  Sr2"1". For the removal of Sr2"1" ions from aqueous media by sepiolite, a third mechanism is important probably, the ion exchange of exchangeable ions from the sepiolite structure channels. As the result of the action of all the sorption mechanisms sepiolite is removes mostly Pb2+ ions, then Cd2+ and least of all Sr2"1" ions from the aqueous media., U radu su prikazani rezultati karakterizacije i određivanja sorpcionih svojstava sepiolita sa lokaliteta Slovići. Određena je tačka nultog naelektrisanja sepiolita pri različitim uslovima i ispitano pomeranje tačke nultog naelektrisanja u prisustvu jona Pb2+, CcF+ I Sr2+. Utvrđeno je da se tačka nultog naelektrisanja menja sa promenom odnosa čvrsto/tečno i ispiranjem praha. U prisustvu jona Pb2+, Cd2+ i Sr2+, tačka nultog naelektrisanja se pomera ka nižim pH vrednostima, što ukazuje na specifičnu sorpciju jona. Određene su adsorpcione izoterme za jone Pb2+, Cd2+ i Sr2+ i količine ovih jona koji se jonski izmenjuju sa Mg2+ jonima iz strukture sepiolita u zavisnosti od ravnotežne koncentracije jona. Najveći afinitet sepiolit ima prema jonima Pb2+, nešto manji prema jonima Cd i najmanji za Sr2+ jone, kako u slučaju specifične sorpcije tako i u slučaju jonske izmene Mg2+ jona iz strukture sepiolita.",
publisher = "Association of Chemical Engineers of Serbia",
journal = "Hemijska industrija",
title = "The sorption of lead, cadmium and strontium from aqueous solutions on sepiolite, Sorpcija jona olova, kadmijuma i stroncijuma iz vodenih rastvora na sepiolitu",
pages = "22-15",
number = "1-2",
volume = "60",
doi = "10.2298/HEMIND0602015L"
}
Lazarević, S., Janković-Častvan, I., Ilić, M. M., Jovanović, D. M., Janaćković, Đ.,& Petrović, R.. (2006). The sorption of lead, cadmium and strontium from aqueous solutions on sepiolite. in Hemijska industrija
Association of Chemical Engineers of Serbia., 60(1-2), 15-22.
https://doi.org/10.2298/HEMIND0602015L
Lazarević S, Janković-Častvan I, Ilić MM, Jovanović DM, Janaćković Đ, Petrović R. The sorption of lead, cadmium and strontium from aqueous solutions on sepiolite. in Hemijska industrija. 2006;60(1-2):15-22.
doi:10.2298/HEMIND0602015L .
Lazarević, Slavica, Janković-Častvan, Ivona, Ilić, Miloje M., Jovanović, Dušan M., Janaćković, Đorđe, Petrović, Rada, "The sorption of lead, cadmium and strontium from aqueous solutions on sepiolite" in Hemijska industrija, 60, no. 1-2 (2006):15-22,
https://doi.org/10.2298/HEMIND0602015L . .

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