Sorption study of radionickel on attapulgite as a function of pH, ionic strength and temperature |
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Authors: | Lei Chen Bin Gao Songsheng Lu Yunhui Dong |
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Institution: | 1. School of Chemical Engineering, Shandong University of Technology, Zibo, 255049, Shandong, China 2. New Star Institute of Applied Technology, No. 451 Huangshan Road, Hefei, 230031, Anhui, People??s Republic of China
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Abstract: | Sorption of radionickel on attapulgite is studied as a function of contact time, ionic strength, pH and temperature. The results indicate that the sorption of Ni(II) on attapulgite is strongly ionic strength-dependent at pH <8, and independent of ionic strength at pH >8. Outer-sphere surface complexation or ion exchange contributes to Ni(II) sorption on attapulgite at pH <8, whereas the sorption of Ni(II) is mainly dominated by inner-sphere surface complexation at pH >8. The sorption of Ni(II) on attapulgite increases with increasing temperature, and the thermodynamic parameters (??H 0, ??G 0 and ??S 0) calculated from the temperature dependent sorption isotherms suggest that the sorption of Ni(II) on attapulgite is a spontaneous and endothermic process. The high sorption capacity of attapulgite suggests that attapulgite is a suitable material for the preconcentration and solidification of radionickel from large volumes of aqueous solutions. |
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