Efficient sorption and reduction of U(VI) on zero-valent iron-polyaniline-graphene aerogel ternary composite

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• 作者：Lili Chen^a ; ^b ; Shaojie Feng^a ; Donglin Zhao^a ; ^{zhaodlin@126.com} ; Shaohua Chen^a ; Feifei Li^a ; Changlun Chen^b ; ^c ; ^{clchen@ipp.ac.cn}
• 关键词：U(VI) ; Fe-PANI-GA composite ; Sorption
• 刊名：Journal of Colloid and Interface Science
• 出版年：2017
• 出版时间：15 March 2017
• 年：2017
• 卷：490
• 期：Complete
• 页码：197-206
• 全文大小：2195 K
• 卷排序：490

文摘

In this work, zero-valent iron-polyaniline-graphene aerogel composite (Fe-PANI-GA) was prepared and applied in the removal of U(VI) from aqueous solutions by batch sorption experiments. The experimental results showed that the Fe-PANI-GA composite had an excellent removal capacity for the removal of U(VI) in acidic solutions. The results also showed that the maximum removal capacity of the Fe-PANI-GA toward U(VI) was 350.47 mg/g at pH 5.5. The sorption kinetics data were well-described by pseudo-second-order. The sorption isotherms of U(VI) fitted well with Langmuir isotherm and exhibited better removal efficiency with the increase of temperature. The thermodynamic parameters (ΔG, ΔS, ΔH) indicated that the sorption of U(VI) on the Fe-PANI-GA was an endothermic and spontaneous process. Moreover, removal mechanisms were studied based on the results of XRD, FTIR and XPS. Both U(VI) sorption and partially reductive precipitation of U(VI) to U(IV) contributed to the removal of U(VI) on Fe-PANI-GA. Therefore, Fe-PANI-GA was an economic and effective material for the removal of uranium from nuclear waste in practical application.