【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46.7m A/（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@r GO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。更多还原

【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.更多还原