The influence of equilibration conditions and hydroxyapatite physico-chemical properties onto retention of Cu2+ ions
Апстракт
The influence of equilibration conditions and hydroxyapatite (HAP) physico-chemical properties onto retention of Cu2+ ions was studied in batch conditions. The amount of cation removed from the solution increased with increasing pH, reaching almost 100% at pH 3. 4 and 7 for 5 x 10(-4), 10(-3) and 5 x 10(-3) mol/dm(3) solutions. respectively. Contact time necessary for reaching equilibrium was found to increase with the increase of Cu2+ concentration. Kinetic and equilibrium data were best described by pseudo-second-order kinetic model and Langmuir theoretical model. The calculated values of separation factors and Gibbs free energy change confirmed that the sorption was spontaneous and thermodynamically feasible at room temperature. The experiments conducted using HAP samples with different physico-chemical characteristics have revealed that the amounts of sorbed Cu2+ depended mainly on the specific surface area and crystallinity of the applied powders. Desorption of Cu2+ was more effic...ient in acidic conditions than in the Solution of competing cation-Ca2+. The samples with higher sorption capacities also demonstrated higher stability; consequently, from the aspects of both higher sorption and lower desorption, utilization of low-crystalline HAP samples with high specific surface area was superior for immobilization of Cu2+ ions. Taking into account molar Cu/Ca ratios. observed final pH changes, copper speciation in the function of pH and the results of X-ray diffraction analyses, conclusions about sorption mechanisms at different experimental conditions were derived. (C) 2008 Elsevier B.V. All rights reserved.
Кључне речи:
Hydroxyapatite / Cu2+ / Sorption / DesorptionИзвор:
Chemical Engineering Journal, 2009, 148, 1, 80-88Финансирање / пројекти:
- Ministry of Science and Environmental Protection of the Republic of Serbia [142050G]
DOI: 10.1016/j.cej.2008.08.003
ISSN: 1385-8947
WoS: 000264699100012
Scopus: 2-s2.0-61349112041
Институција/група
VinčaTY - JOUR AU - Šljivić-Ivanović, Marija Z. AU - Smičiklas, Ivana D. AU - Plećaš, Ilija B. AU - Mitrić, Miodrag PY - 2009 UR - https://vinar.vin.bg.ac.rs/handle/123456789/3664 AB - The influence of equilibration conditions and hydroxyapatite (HAP) physico-chemical properties onto retention of Cu2+ ions was studied in batch conditions. The amount of cation removed from the solution increased with increasing pH, reaching almost 100% at pH 3. 4 and 7 for 5 x 10(-4), 10(-3) and 5 x 10(-3) mol/dm(3) solutions. respectively. Contact time necessary for reaching equilibrium was found to increase with the increase of Cu2+ concentration. Kinetic and equilibrium data were best described by pseudo-second-order kinetic model and Langmuir theoretical model. The calculated values of separation factors and Gibbs free energy change confirmed that the sorption was spontaneous and thermodynamically feasible at room temperature. The experiments conducted using HAP samples with different physico-chemical characteristics have revealed that the amounts of sorbed Cu2+ depended mainly on the specific surface area and crystallinity of the applied powders. Desorption of Cu2+ was more efficient in acidic conditions than in the Solution of competing cation-Ca2+. The samples with higher sorption capacities also demonstrated higher stability; consequently, from the aspects of both higher sorption and lower desorption, utilization of low-crystalline HAP samples with high specific surface area was superior for immobilization of Cu2+ ions. Taking into account molar Cu/Ca ratios. observed final pH changes, copper speciation in the function of pH and the results of X-ray diffraction analyses, conclusions about sorption mechanisms at different experimental conditions were derived. (C) 2008 Elsevier B.V. All rights reserved. T2 - Chemical Engineering Journal T1 - The influence of equilibration conditions and hydroxyapatite physico-chemical properties onto retention of Cu2+ ions VL - 148 IS - 1 SP - 80 EP - 88 DO - 10.1016/j.cej.2008.08.003 ER -
@article{ author = "Šljivić-Ivanović, Marija Z. and Smičiklas, Ivana D. and Plećaš, Ilija B. and Mitrić, Miodrag", year = "2009", abstract = "The influence of equilibration conditions and hydroxyapatite (HAP) physico-chemical properties onto retention of Cu2+ ions was studied in batch conditions. The amount of cation removed from the solution increased with increasing pH, reaching almost 100% at pH 3. 4 and 7 for 5 x 10(-4), 10(-3) and 5 x 10(-3) mol/dm(3) solutions. respectively. Contact time necessary for reaching equilibrium was found to increase with the increase of Cu2+ concentration. Kinetic and equilibrium data were best described by pseudo-second-order kinetic model and Langmuir theoretical model. The calculated values of separation factors and Gibbs free energy change confirmed that the sorption was spontaneous and thermodynamically feasible at room temperature. The experiments conducted using HAP samples with different physico-chemical characteristics have revealed that the amounts of sorbed Cu2+ depended mainly on the specific surface area and crystallinity of the applied powders. Desorption of Cu2+ was more efficient in acidic conditions than in the Solution of competing cation-Ca2+. The samples with higher sorption capacities also demonstrated higher stability; consequently, from the aspects of both higher sorption and lower desorption, utilization of low-crystalline HAP samples with high specific surface area was superior for immobilization of Cu2+ ions. Taking into account molar Cu/Ca ratios. observed final pH changes, copper speciation in the function of pH and the results of X-ray diffraction analyses, conclusions about sorption mechanisms at different experimental conditions were derived. (C) 2008 Elsevier B.V. All rights reserved.", journal = "Chemical Engineering Journal", title = "The influence of equilibration conditions and hydroxyapatite physico-chemical properties onto retention of Cu2+ ions", volume = "148", number = "1", pages = "80-88", doi = "10.1016/j.cej.2008.08.003" }
Šljivić-Ivanović, M. Z., Smičiklas, I. D., Plećaš, I. B.,& Mitrić, M.. (2009). The influence of equilibration conditions and hydroxyapatite physico-chemical properties onto retention of Cu2+ ions. in Chemical Engineering Journal, 148(1), 80-88. https://doi.org/10.1016/j.cej.2008.08.003
Šljivić-Ivanović MZ, Smičiklas ID, Plećaš IB, Mitrić M. The influence of equilibration conditions and hydroxyapatite physico-chemical properties onto retention of Cu2+ ions. in Chemical Engineering Journal. 2009;148(1):80-88. doi:10.1016/j.cej.2008.08.003 .
Šljivić-Ivanović, Marija Z., Smičiklas, Ivana D., Plećaš, Ilija B., Mitrić, Miodrag, "The influence of equilibration conditions and hydroxyapatite physico-chemical properties onto retention of Cu2+ ions" in Chemical Engineering Journal, 148, no. 1 (2009):80-88, https://doi.org/10.1016/j.cej.2008.08.003 . .