Sorption of U(VI) species on hydroxyapatite
Sorption of U(VI) species on hydroxyapatite
复制标题
DOI：
10.1524/ract.2005.93.7.385
复制
发表时间：
2005-07
影响因子：
1.8
通讯作者：
P. Thakur;R. Moore;G. Choppin
中科院分区：
文献类型：
--
作者：
P. Thakur;R. Moore;G. Choppin
摘要 研究了羟基磷灰石对铀酰 (UO22+) 阳离子的吸附与吸附剂用量、离子强度、U(VI) 浓度、pH 和温度的函数关系。羟基磷灰石上铀酰的吸附速率随着铀酰浓度的增加而降低。吸附量随着离子强度的增加而减少，并随着 pH 值的增加而增加，在 7-8 时达到最大值。 UO22+ 的吸附数据与 Freundlich 和 Dubinin–Radushkevich (D–R) 等温线吻合良好。阴离子Cl−、NO3−、SO42- 和CH3COO− 降低了羟基磷灰石对铀的吸附，而S2O32- 则略微增加了铀在羟基磷灰石上的吸附。吸附的铀通过 0.10 M 和 1.00 M HCl 和 HNO3 溶液解吸。在 298、313、323 和 333 K 的温度下测量了 UO22+ 吸附的热力学参数。温度依赖性证实了吸附的吸热。计算得出吸附过程的活化能为+2.75±0.02 kJ/mol。
Abstract The sorption of uranyl (UO22+) cations to hydroxyapatite was studied as a function of the amount of sorbent, ionic strength, U(VI) concentration, pH and temperature. The rate of uranyl sorption on hydroxyapatite decreased with increased uranyl concentrations. The amount sorbed decreased with increased ionic strength and increased with pH to a maximum at 7–8. The sorption data for UO22+ were fitted well by the Freundlich and Dubinin–Radushkevich (D–R) isotherms. The anions Cl−, NO3−, SO42- and CH3COO− decreased the sorption of uranium on hydroxyapatite while S2O32- slightly increased it. The sorbed uranium was desorbed by 0.10 M and 1.00 M solutions of HCl and HNO3. The thermodynamic parameters for the sorption of UO22+ were measured at temperatures of 298, 313, 323 and 333 K. The temperature dependence confirmed an endothermic heat of sorption. The activation energy for the sorption process was calculated to be +2.75±0.02 kJ/mol.