Performance and Mechanism on Removal of U(Ⅵ) from Aqueous Solution by Nano Zero-valent Iron Loaded on Rock Wool
LI Xiaoyan1, FU Xiaohui1, LI Guanchao2, WANG Yuying1, HUANG Xi1, LIU Xiaoliang1, HU Weifang1, LIU Yibao1,*
1 State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang 330013, China 2 Radiation Environment Monitoring Center of Guangdong Geological Bureau of Nuclear Industry, Guangzhou 510800, China
摘要 通过液相还原法制备岩棉负载纳米零价铁(Nano zero-valent iron loaded on rock wool, RW/nZVI),并利用X射线衍射(XRD)、扫描电子显微镜(SEM)、X 射线光电子能谱(XPS)等手段对其物质组成及微观形貌进行表征。以对溶液中U(Ⅵ)的去除能力为考核指标,运用等温吸附模型和动力学模型研究其去除溶液中U(Ⅵ)的机理。结果表明,岩棉负载可以明显改善纳米零价铁的团聚,且对溶液中U(Ⅵ)有较好的去除效果,其吸附等温线符合Langmuir 模型,模拟最大吸附量为79.681 mg/g,动力学过程符合准二级吸附动力学和准一级还原动力学,表明吸附为单分子层吸附,且是通过吸附和还原作用去除溶液中的U(Ⅵ)。
Abstract: Nano zero-valent iron loaded on rock wool (RW/nZVI) was prepared by liquid phase reduction method, and the material composition and microstructure were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The removal ability of U(Ⅵ) in solution was taken as the evaluation index, and the isothermal adsorption model and kinetic model was used to study the mechanism on U(Ⅵ) removal from aqueous solution. The results show that the aggregation of nano zero-valent iron can be obviously reduced by being loaded on rock wool, and the removal effect on U(Ⅵ) from the aqueous solution has been improved. The adsorption isotherm accords with Langmuir model, and the maximum adsorption capacity by simulation was 79.681 mg/g. The kinetic process accords with the pseudo-secon-dorder adsorption kinetic model and the pseudo-first-order reduction kinetic model, which indicates that the adsorption is monolayer adsorption and U(Ⅵ) in the solution is removed by adsorption and reduction.
李小燕, 付晓辉, 李冠超, 王昱莹, 黄希, 刘小亮, 胡伟芳, 刘义保. 岩棉负载纳米零价铁去除溶液中U(Ⅵ)的性能和机理[J]. 材料导报, 2022, 36(20): 22040131-7.
LI Xiaoyan, FU Xiaohui, LI Guanchao, WANG Yuying, HUANG Xi, LIU Xiaoliang, HU Weifang, LIU Yibao. Performance and Mechanism on Removal of U(Ⅵ) from Aqueous Solution by Nano Zero-valent Iron Loaded on Rock Wool. Materials Reports, 2022, 36(20): 22040131-7.
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2022, Vol. 36 
