Effect of pH,ionic strength and humic substances on the adsorption of Uranium (VI) onto Na-rectorite |
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| Authors: | Donglin Zhao Shubin Yang Shaohua Chen Zhiqiang Guo Xin Yang |
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| Affiliation: | (1) School of Materials and Chemical Engineering, Anhui University of Architecture, Hefei, Anhui, 230601, People’s Republic of China;(2) Key Laboratory of Novel Thin Film Solar Cells, Institute of Plasma Physics, Chinese Academy of Sciences, P.O. Box 1126, 230031 Hefei, People’s Republic of China |
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| Abstract: | 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 (ΔH 0, ΔS 0, and ΔG 0) 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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