摘要：

采用液相还原法制备糯米粉负载纳米零价铁（GR-nZVI），用SEM、XRD、XPS对材料进行表征。探讨了接触时间、U（Ⅵ）初始浓度、温度对溶液中U（Ⅵ）去除效果的影响，并进行吸附动力学、热力学和等温吸附分析。结果表明，GR-nZVI吸附U（Ⅵ）是自发且不可逆的吸热反应，符合准二级动力学模型，Langmuir和Freundlich等温吸附模型对该过程的拟合程度都较高，表明GR-nZVI对U（Ⅵ）的去除是物理吸附和化学吸附并存，单分子层吸附和多分子层吸附并存的过程。

关键词: 糯米, 纳米零价铁, U（Ⅵ）, 吸附

Abstract:

Nano zero-valent iron loaded with glutinous rice powder(GR-nZVI) was prepared by liquid phase reduction method, and characterized by scanning electron microscopy(SEM), X-ray diffraction(XRD), and X-ray photoelectron spectroscopy(XPS). The effects of contact time, U(Ⅵ) initial concentration and temperature on the removal of U(Ⅵ) were discussed. The kinetics, thermodynamics, and isothermal adsorption models were analyzed. The results showed that the process of U(Ⅵ) adsorbed by GR-nZVI was spontaneous and irreversible endothermic reaction, agreed well with the pseudo-second-order kinetic model. The adsorption behavior of GR-nZVI was highly compatible with Langmuir and Freundlich isothermal adsorption models, indicating that the removal of U(Ⅵ) was a physical adsorption coexisting with chemisorption, monolayer adsorption coexisting with multi-layer adsorption.

Key words: glutinous rice, nano zero-valent iron, U(Ⅵ), adsorption

中图分类号: 

• X703