Microwave hydrothermal synthesis, characterization and excellent uranium adsorption properties of CoFe2O4@rGO nanocomposite

来源期刊:中南大学学报(英文版)2021年第7期

论文作者:易兵 伍水生 兰东辉 张晓文 黄毅 邓兴红 区泽棠

文章页码:1955 - 1965

Key words:CoFe2O4; graphene; uranium; adsorption properties

Abstract: To improve the adsorption performance and simplify uranium separation from aqueous media in post-treatment processes, a magnetic CoFe2O4@rGO composite was synthesized by microwave-hydrothermal method. The results of XRD, Raman, TEM/HRTEM, FTIR, BET and VSM characterization show that spinel-type cobalt ferrite CoFe2O4 nanoparticles ca. 13.4 nm in size are dispersedly anchored on the graphene sheet, and the saturation magnetization of the nanocomposite is 46.7 mA/(m2·g). The effects of different pH, initial concentration and other conditions on uranium adsorption capacity were investigated, and adsorption kinetics equations were fitted to determine the adsorption behaviour of uranium on CoFe2O4@rGO in simulated uranium-containing seawater. It was observed that the uranium adsorption capacity of CoFe2O4@rGO composite at pH=5 is 127.6 mg/g, which is 1.31 and 2.43 times that of rGO and pure CoFe2O4. The adsorption process conforms to Langmuir and quasi-second-order kinetic model. The excellent adsorption performance of CoFe2O4@rGO makes it potentially useful in the treatment of uranium-polluted water.

Cite this article as: WU Shui-sheng, LAN Dong-hui, ZHANG Xiao-wen, HUANG Yi, DENG Xing-hong, AU Chak-tong, YI Bing. Microwave hydrothermal synthesis, characterization and excellent uranium adsorption properties of CoFe2O4@rGO nanocomposite [J]. Journal of Central South University, 2021, 28(7): 1955-1965. DOI: https://doi.org/ 10.1007/s11771-021-4744-4.

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