Cadmium fixation by synthetic hydroxyapatite in aqueous solution - Thermal behaviour

被引:71
作者
Marchat, David
Bernache-Assollant, Didier
Champion, Eric
机构
[1] Fac Sci & Tech, UMR CRNS 6638, F-87060 Limoges, France
[2] Ecole Natl Super Mines, CIS, F-42023 St Etienne, France
关键词
hydroxyapatite; cadmium; ion exchange; solid solution;
D O I
10.1016/j.jhazmat.2006.02.040
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
This study deals with the mechanism of the cadmium uptake by synthetic hydroxyapatite (HA: Ca-10(PO4)(6)(OH)(2)) in aqueous solution. The rate of cadmium fixation by hydroxyapatite was investigated at 10 and 50 degrees C using batch experiments. Inductively coupled plasma atomic emission spectrometry, X-ray diffraction, FT-IR spectroscopy and electron microscopy were used to characterize the starting HA and the samples. The thermal behaviour of the powders was determined with the help of three thermoanalytical techniques (TGA, DTA, and MS) and temperature programmed X-ray diffraction. Cadmium immobilization kinetics can be divided into two steps: substitution of Ca2+ ions by Cd2+ in the HA lattice at the particle's surface, followed by their incorporation into the hydroxyapatite bulk. This results in the formation of an apatite solid solution, which is very important because in this way decontamination and storage can be performed with the same material. (c) 2006 Elsevier B.V. All rights reserved.
引用
收藏
页码:453 / 460
页数:8
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