Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5347124 | Applied Surface Science | 2017 | 24 Pages |
Abstract
Polyaniline (PANI) modified bentonite (PANI/bentonie) was synthesized by plasma induced polymerization of aniline on bentonite surface, and applied to uptake of uranium(VI) ions from aqueous solution. The as-synthesized PANI/bentonie was characterized by scanning electron microscopy (SEM), powder X-ray diffraction (XRD), thermal gravimetric analysis (TGA), and X-ray photoelectron spectroscopy (XPS). Batch adsorption technique was utilized to investigate the adsorption of U(VI) on bentonite and PANI/bentonite. The adsorption of U(VI) (10Â mg/L) on PANI/bentonite surface is fairly depend on solution pH, ionic strength, and temperature in solution. The modified PANI on PANI/bentonite surface significantly enhances its adsorption capability for U(VI). The presence of humic acid (HA) can sound enhance U(VI) adsorption on PANI/bentonite at pHÂ <Â 6.5 because of the strong complexation, and inhibits U(VI) adsorption at pHÂ >Â 6.5. According to the thermodynamic parameters, the adsorption of U(VI) on PANI/bentonite surface is a spontaneous and endothermic process. The results highlight the application of PANI/bentonite composites as candidate material for the uptake of trace U(VI) from aqueous solution.
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Authors
Xinghao Liu, Cheng Cheng, Chengjian Xiao, Dadong Shao, Zimu Xu, Jiaquan Wang, Shuheng Hu, Xiaolong Li, Weijuan Wang,