Factors influencing the removal of divalent cations by hydroxyapatite
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2008
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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, fo...llowed 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.
Ključne reči:
hydroxyapatite / cation sorption / equilibrium / kinetics / sorption mechanisms / pHpzcIzvor:
Journal of Hazardous Materials, 2008, 152, 2, 876-884Izdavač:
- Elsevier, Amsterdam
DOI: 10.1016/j.jhazmat.2007.07.056
ISSN: 0304-3894
PubMed: 17764836
WoS: 000254765100051
Scopus: 2-s2.0-40049096356
Institucija/grupa
Tehnološko-metalurški fakultetTY - JOUR AU - Smičiklas, Ivana D. AU - Onjia, Antonije AU - Raičević, Slavica AU - Janaćković, Đorđe AU - Mitrić, Miodrag PY - 2008 UR - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1316 AB - 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. PB - Elsevier, Amsterdam T2 - Journal of Hazardous Materials T1 - Factors influencing the removal of divalent cations by hydroxyapatite EP - 884 IS - 2 SP - 876 VL - 152 DO - 10.1016/j.jhazmat.2007.07.056 ER -
@article{ author = "Smičiklas, Ivana D. and Onjia, Antonije and Raičević, Slavica and Janaćković, Đorđe and Mitrić, Miodrag", year = "2008", 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.", publisher = "Elsevier, Amsterdam", journal = "Journal of Hazardous Materials", title = "Factors influencing the removal of divalent cations by hydroxyapatite", pages = "884-876", number = "2", volume = "152", doi = "10.1016/j.jhazmat.2007.07.056" }
Smičiklas, I. D., Onjia, A., Raičević, S., Janaćković, Đ.,& Mitrić, M.. (2008). Factors influencing the removal of divalent cations by hydroxyapatite. in Journal of Hazardous Materials Elsevier, Amsterdam., 152(2), 876-884. https://doi.org/10.1016/j.jhazmat.2007.07.056
Smičiklas ID, Onjia A, Raičević S, Janaćković Đ, Mitrić M. Factors influencing the removal of divalent cations by hydroxyapatite. in Journal of Hazardous Materials. 2008;152(2):876-884. doi:10.1016/j.jhazmat.2007.07.056 .
Smičiklas, Ivana D., Onjia, Antonije, Raičević, Slavica, Janaćković, Đorđe, Mitrić, Miodrag, "Factors influencing the removal of divalent cations by hydroxyapatite" in Journal of Hazardous Materials, 152, no. 2 (2008):876-884, https://doi.org/10.1016/j.jhazmat.2007.07.056 . .