Removal of uranium(VI) and thorium(IV) ions from aqueous solutions by functionalized silica: kinetic and thermodynamic studies

被引：37
|
作者：
Humelnicu, Doina [1 ]
Blegescu, Catalin [1 ]
Ganju, Dumitru [1 ]
机构：
[1] Alexandru Ioan Cuza Univ, Fac Chem, Iasi 700506, Romania
来源：
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY | 2014年 / 299卷 / 03期
关键词：
Adsorption; Functionalized silica; Uranium; Thorium; Isotherm; ACTIVATED CARBON; ACETATE CLUSTER; URANYL-ION; ADSORPTION; SORPTION; BEHAVIOR; COMPLEXES; RECOVERY; ZEOLITE; EU(III);
D O I：
10.1007/s10967-013-2873-4
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
Adsorption behavior of uranyl and thorium ions from synthetic radioactive solutions onto functionalized silica as sorbent has been investigated. The effect of contact time, initial concentration of radioactive solutions, sorbent mass, pH value and temperature on the adsorption capacity of the sorbent was investigated. Negative values of Gibbs free energy of adsorption suggested the spontaneity of the adsorption process on both functionalized silica with -NH2 groups and with-SH groups. Positive values obtained for Delta H degrees indicates that the adsorption is an endothermic process. The adsorption isotherms were better fitted by Freundlich model and the adsorption kinetic was well described by the pseudo-second order equation. Desorption studies indicated that the most favorable desorptive reagents for UO22+ is HNO3 1 M and for Th4+ is EDTA 1 M solutions.
引用
收藏
页码：1183 / 1190
页数：8
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