Effect of pH, ionic strength and humic substances on the adsorption of Uranium (VI) onto Na-rectorite

被引：0
|
作者：
Donglin Zhao
Shubin Yang
Shaohua Chen
Zhiqiang Guo
Xin Yang
机构：
[1] Anhui University of Architecture,School of Materials and Chemical Engineering
[2] Institute of Plasma Physics,Key Laboratory of Novel Thin Film Solar Cells
[3] Chinese Academy of Sciences,undefined
来源：
Journal of Radioanalytical and Nuclear Chemistry | 2011年 / 287卷
关键词：
Na-rectorite; U(VI); Adsorption; Humic acid; Fulvic acid;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
In this study, the adsorption of U(VI) from aqueous solution on Na-rectorite was studied as a function of various environmental conditions such as contact time, pH, ionic strength, soil humic acid (HA)/fulvic acid (FA), solid contents, and temperature under ambient conditions by using batch technique. The kinetic adsorption is fitted by the pseudo-second-order model very well. The adsorption of U(VI) on Na-rectorite was strongly dependent on pH and ionic strength. A positive effect of HA/FA on U(VI) adsorption was found at low pH, whereas a negative effect was observed at high pH. The presence of HA/FA enhanced the U(VI) adsorption at low pH values, but reduced U(VI) adsorption at high pH. The thermodynamic parameters (ΔH0, ΔS0, and ΔG0) were also calculated from the temperature dependent adsorption isotherms, and the results suggested that the adsorption of U(VI) on Na-rectorite was a spontaneous and endothermic process.
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页码：557 / 565
页数：8
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