Influence of pH,soil humic acid,ionic strength and temperature on sorption of U(VI) onto attapulgite |
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| Authors: | Liqiang Tan Xiaoli Tan Xuemei Ren Huiyang Mei Xiangke Wang |
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| Affiliation: | 1.College of Environmental Science and Engineering,North China Electric Power University,Beijing,People’s Republic of China;2.Institute of Plasma Physics,Chinese Academy of Sciences,Hefei,People’s Republic of China;3.Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education Institutions,Soochow University,Suzhou,People’s Republic of China |
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| Abstract: | The surface property of attapulgite was investigated by N2-BET surface area and zeta potential analysis in this paper. Solution pH had a remarkable effect on the sorption process, indicated an inner-sphere complexation. Humic acid (HA) in the solution enhanced U(VI) sorption significantly at pH??9.0. The characteristic fluorescence changes of HA indicated that a strong chemical reaction occurred between the functional groups in HA and UO22+. The sorption was a spontaneous and endothermic process with increased entropy, and the increase in temperature would benefit the sorption. |
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