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.
摘要
通过微波水热法合成磁性CoFe2O4@rGO 纳米复合材料。XRD、Raman、TEM/HRTEM、FTIR、 BET 和VSM 表征结果表明,尺寸约为13 nm 的尖晶石型CoFe2O4 纳米粒子分散锚定在石墨烯片上, 其饱和磁化强度为46.7 mA/(m2·g),满足磁分离要求。研究了不同pH 值、初始浓度等条件对 CoFe2O4@rGO 铀吸附容量的影响,确定了铀在水中的吸附行为并拟合了吸附动力学方程。结果表明 在pH=5 时,CoFe2O4@rGO 纳米复合材料吸附铀的能力为127.6 mg/g,分别是rGO 和纯CoFe2O4 的 1.31 和2.43 倍。吸附过程符合Langmuir 和准二级动力学模型。CoFe2O4@rGO 纳米复合材料优良的吸 附性能使其在处理铀污染水方面具有潜在的用途。
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Funding
Project(19B126) supported by the Scientific Research Fund of Hunan Provincial Education Department, China; Project(21772035) supported by the National Natural Science Foundation of China; Projects(2018JJ3099, 2019JJ40058) supported by the Provincial Natural Science Foundation of Hunan, China; Project supported by the Innovation and Entrepreneurship Training Program of Hunan Institute of Engineering, China
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The overarching research goals were developed by WU Shui-sheng and YI Bing. LAN Dong-hui and ZHANG Xiao-wen carried out mechanical tests. HUANG Yi and DENG Xing-hong analyzed the data. WU Shui-sheng and AU Chak-tong wrote the paper. All authors replied to reviewers’ comments and revised the final version.
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Wu, Ss., Lan, Dh., Zhang, Xw. et al. Microwave hydrothermal synthesis, characterization and excellent uranium adsorption properties of CoFe2O4@rGO nanocomposite. J. Cent. South Univ. 28, 1955–1965 (2021). https://doi.org/10.1007/s11771-021-4744-4
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DOI: https://doi.org/10.1007/s11771-021-4744-4