Novel graphene oxide/bentonite composite for uranium(VI) adsorption from aqueous solution |
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| Authors: | Hongjuan Liu Shuibo Xie Ju Liao Tianrun Yan Yingjiu Liu Xinhai Tang |
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| Institution: | 1.Institute of Nuclear Science and Technology,University of South China,Hengyang,People’s Republic of China;2.Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy,University of South China,Hengyang,People’s Republic of China;3.Hunan Province Key Laboratory of Pollution Control and Resources Reuse Technology,University of South China,Hengyang,People’s Republic of China;4.School of Mechanical Engineering,Shanghai Jiao Tong University,Shanghai,People’s Republic of China |
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| Abstract: | A novel graphene oxide/bentonite composite (GO/bentonite) was synthesized and then characterized through powder X-ray diffraction, fourier transform infrared spectroscopy, thermogravimetric analysis, scanning electron microscopy, and energy dispersive spectroscopy. Adsorption achieved equilibrium within 10 min. Moreover, U(VI) adsorption on GO/bentonite was highly dependent on solution pH and independent of ionic strength. These characteristics suggested that inner-sphere surface complexes of U(VI) formed on GO/bentonite. The adsorption of U(VI) from aqueous solution on GO/bentonite was fitted to the pseudo-second-order and Freundlich isotherm models. The maximum sorption capacity of GO/bentonite was 234.19 mg g?1 under neutral pH at 303 K. GO/bentonite is a potentially powerful adsorbent for the efficient removal of U(VI) from aqueous solutions. |
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