磁性二氧化锰对U(Ⅵ)的吸附性能  

Adsorption of U(Ⅵ) in Aqueous Solution by Magnetic Manganese Dioxide

作　　者：肖哲 张志宾[1] 潘素素[1] 曹小红[1] 刘云海[1] 郑智阳 王有群[1] XIAO Zhe;ZHANG Zhibin;PAN Susu;CAO Xiaohong;LIU Yunhai;ZHENG Zhiyang;WANG Youqun(State Key Laboratory of Nuclear Resources and Environment, East China University of Technology,Nanchang 330013,China)

机构地区：[1]东华理工大学核资源与环境国家重点实验室

出　　处：《湿法冶金》2019年第3期195-201,共7页Hydrometallurgy of China

基　　金：江西省教育厅资助项目(GJJ160577);核资源与环境国家重点实验室基金资助项目(NRE1813)

摘　　要：研究了采用一锅法制备磁性二氧化锰(Fe3O4@MnO2),并用以从水溶液中去除U(Ⅵ)。采用Zeta电位仪、傅里叶变换红外光谱仪(FT-IR)和X-射线衍射仪(XRD)表征Fe3O4、MnO2和Fe3O4@MnO2的结构,考察了溶液pH、接触时间、温度、U(Ⅵ)初始质量浓度对Fe3O4、MnO2和Fe3O4@MnO2吸附U(Ⅵ)的影响。结果表明:Fe3O4@MnO2可用于从溶液中吸附U(Ⅵ),最佳吸附pH为6.0,吸附过程符合准二级动力学模型,吸附反应可自发进行;Fe3O4、MnO2和Fe3O4@MnO2对U(Ⅵ)的吸附均符合Langmuir等温吸附模型,饱和吸附量分别为58.14、113.69和204.08mg/g。Fe3O4@MnO2是一种潜在高效吸附U(Ⅵ)的材料,可用以去除和回收放射性废水中的U(Ⅵ)。Magnetic manganese dioxide (Fe 3O 4@MnO 2) was prepared by one-pot method and used to remove U(Ⅵ).Fe 3O 4,MnO 2,Fe 3O 4@MnO 2 were characterized by Zeta potentialmeter,Fourier transform-infrared spectroscopy(FT-IR) and X-ray diffractometer(XRD).The effects of pH,contact time,temperature and initial concentration of U(Ⅵ) on the adsorption of U(Ⅵ) by Fe 3O 4@MnO 2 were investigated systematically.The results show that the optimal solution pH is 6.0.The adsorption process is in accordance with the quasi-secondary kinetic model,the adsorption reaction Δ H >0 and Δ G <0 which indicates that the adsorption of U(Ⅵ) by Fe 3O 4@MnO 2 is a spontaneous endothermic process.The adsorption of U(Ⅵ) by Fe 3O 4,MnO 2 and Fe 3O 4@MnO 2 accords with the Langmuir isotherm model.The saturated adsorption capacities of monolayers are 58.14 mg/g(Fe 3O 4), 113.69 mg/g(MnO 2) and 204.08 mg/g(Fe 3O 4@MnO 2).The results indicate that Fe 3O 4@MnO 2 is a potentially high-efficiency adsorbent for removing and recovering U(Ⅵ) in wastewater.

关 键 词：磁性 二氧化锰 U(Ⅵ) 吸附 

分 类 号：TL212[核科学技术—核燃料循环与材料] X131.2[环境科学与工程—环境科学]