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Factors influencing the removal of divalent cations by hydroxyapatite
dc.creator | Smičiklas, Ivana D. | |
dc.creator | Onjia, Antonije E. | |
dc.creator | Raičević, Slavica | |
dc.creator | Janaćković, Đorđe T. | |
dc.creator | Mitrić, Miodrag | |
dc.date.accessioned | 2018-03-01T20:22:03Z | |
dc.date.available | 2018-03-01T20:22:03Z | |
dc.date.issued | 2008 | |
dc.identifier.issn | 0304-3894 | |
dc.identifier.uri | https://vinar.vin.bg.ac.rs/handle/123456789/3405 | |
dc.description.abstract | The effect of pH, contact time, initial metal concentration and presence of common competing cations, on hydroxyapatite (HAP) sorption properties towards Ph2+, Cd2+, Zn2+, and Sr2+ ions was studied and compared using a batch technique. The results strongly indicated the difference between the sorption mechanism of Pb2+ and other investigated cations: the removal of Pb2+ was pH-independent and almost complete in the entire pH range (3-12), while the sorption of Cd2+, Zn2+ and Sr2+ generally increased with an increase of pH; the contact time required for attaining equilibrium was 30 mm for Pb 2+ versus 24h needed for other cations; maximum sorption capacity of HAP sample was found to be an order of magnitude higher for Pb2+ (3.263 mmol/g), than for Cd2+ (0.601 mmol/g), Zn (2+) (0.574 mmol/g) and Sr2+ (0.257 mmol/g); the selectivity of HAP was found to decrease in the order Ph2+ GT Cd2+ GT Zn2+ GT Sr2+ while a decrease of pHpzc, in respect to the value obtained in inert electrolyte, followed the order Cd2+ GT Zn2+ GT Ph2+ GT Sr2+; neither of investigated competing cations (Ca2+, Mg2+, Na+ and K+) influenced Pb2+ immobilization whereas the sorption of other cations was reduced in the presence of Ca2+, in the order Sr2+ GT Cd2+ GT Zn (2+). The pseudo-second order kinetic model and Langmuir isotherm have been proposed for modeling kinetic and equilibrium data, respectively. The sorption of all examined metals was followed by Ca2+ release from the HAP crystal lattice and pH decrease. The ion exchange and specific cation sorption mechanisms were anticipated for Cd2+, Zn2+ and Sr2+, while dissolution of HAP followed by precipitation of hydroxypyromorphite (Pb-10(PO4)(6)(OH)(2)) was found to be the main operating mechanism for Pb 2+ immobilization by HAP, with the contribution of specific cation sorption. (c) 2007 Elsevier B. V. All rights reserved. | en |
dc.rights | restrictedAccess | en |
dc.source | Journal of Hazardous Materials | en |
dc.subject | hydroxyapatite | en |
dc.subject | cation sorption | en |
dc.subject | equilibrium | en |
dc.subject | kinetics | en |
dc.subject | sorption mechanisms | en |
dc.subject | pHpzc | en |
dc.title | Factors influencing the removal of divalent cations by hydroxyapatite | en |
dc.type | article | en |
dcterms.abstract | Раицевиц, С.; Јанацковиц, Д.; Оњиа, A.; Смициклас Ивана; Митрић Миодраг; | |
dc.citation.volume | 152 | |
dc.citation.issue | 2 | |
dc.citation.spage | 876 | |
dc.citation.epage | 884 | |
dc.identifier.wos | 000254765100051 | |
dc.identifier.doi | 10.1016/jjhazmat.2007.07.056 | |
dc.citation.rank | M21a | |
dc.identifier.pmid | 17764836 |
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