吸附
水溶液
石墨烯
氧化物
解吸
弗伦德利希方程
化学工程
材料科学
化学
等温过程
无机化学
有机化学
热力学
工程类
物理
作者
Yan-Rong He,Shicheng Li,Xiaolong Li,Yang� Yang,Aihua Tang,Liang Du,Zhijian Tan,Dong Zhang,Hongbing Chen
标识
DOI:10.1016/j.cej.2018.01.037
摘要
In the present study, graphene (rGO) hydrogel was fabricated by reducing graphene oxide (GO) with ascorbic acid to remove U(VI) from aqueous solution. The resulting rGO hydrogel shows a 3D porous network structure and good mechanical stability. The effect of contact time, pH, and initial U(VI) concentration on U(VI) adsorption, as well as the reusability of the material were estimated with batch experiments. The results illustrate that U(VI) adsorption on rGO hydrogel agreed well with pseudo-second order kinetic model, indicating a chemical adsorption. According to correlation coefficients, Freundlich model is the most suitable isothermal model to describe the U(VI) adsorption process of rGO hydrogel, with a maximum adsorption capacity of 134.23 mg/g (pH 4.0). The solution pH posed significant influence on U(VI) adsorption: the adsorption amount rises sharply from pH 2.0 to 4.6, reaches a plateau at 4.6–6.5, and then declines slightly at pH levels above 6.5. The rGO hydrogel shows good reusability, with maintaining 94.76% adsorption ability after ten adsorption/desorption cycles, demonstrating that rGO hydrogel is a promising adsorbent for U(VI) removal from aqueous solution, providing a new insight for the developing of U(VI) adsorbents.
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