一种用于制备超轻石墨烯气凝胶的简单方法，用于快速去除水溶液中的 U(VI)。
A simple method for preparing ultra-light graphene aerogel for rapid removal of U(VI) from aqueous solution.
机构信息
Key Laboratory of Advanced Functional Materials, Key Laboratory of and Functional Molecule Design and Interface Process, Anhui Jianzhu University, Hefei, 230601, PR China; Key Laboratory of Photovoltaic and Energy Conservation Materials, Institute of Plasma Physics, Chinese Academy of Sciences, P.O. Box 1126, Hefei, 230031, Anhui, PR China.
Key Laboratory of Advanced Functional Materials, Key Laboratory of and Functional Molecule Design and Interface Process, Anhui Jianzhu University, Hefei, 230601, PR China.
出版信息
Environ Pollut. 2019 Aug;251:547-554. doi: 10.1016/j.envpol.2019.05.011. Epub 2019 May 9.
In this study, graphene aerogel (GA) was successfully prepared through a simple hydrothermal method. The resulting GA exhibited a porous network structure with a large specific surface area (350.8 m/g), ultra-light mass and easy separation from water. The pH value of the GA was estimated to be 3.5. The adsorption process and the factors that affect adsorption capacity were studied. The adsorption could be conducted in a wide pH range from 2.0 to 7.0. The maximum adsorption capacity of GA towards U(VI) at pH 4.0 and T = 298 K was 238.67 mg/g calculated from the Langmuir model. The GA had greatly rapid adsorption property for the removal of U(VI) at pH 4.0. Kinetic data showed good correlation with pseudo-second-order equation. Fourier transform infrared spectroscopy and X-ray photoelectron spectrometry characterizations showed that GA adsorbed U(VI) through chemical interaction by oxygen-containing and nitrogen-containing groups functional groups. The results show that GA has excellent application potential as an adsorbent material for removing U(VI) from aqueous solution.
在这项研究中，通过一种简单的水热法成功制备了石墨烯气凝胶（GA）。所得到的 GA 具有多孔网络结构，比表面积大（350.8 m/g），质量超轻，易于与水分离。GA 的 pH 值估计为 3.5。研究了吸附过程和影响吸附容量的因素。吸附可以在 2.0 到 7.0 的宽 pH 范围内进行。根据 Langmuir 模型计算，在 pH 4.0 和 T = 298 K 下，GA 对 U(VI)的最大吸附容量为 238.67 mg/g。GA 在 pH 4.0 下对 U(VI)的去除具有非常快速的吸附性能。动力学数据与拟二级方程具有良好的相关性。傅里叶变换红外光谱和 X 射线光电子能谱表征表明，GA 通过含氧和含氮基团官能团的化学相互作用吸附 U(VI)。结果表明，GA 作为一种从水溶液中去除 U(VI)的吸附材料具有优异的应用潜力。
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