中文摘要：

采用液相还原法制备纳米零价铁（nZVI），用来去除溶液中的 U （Ⅵ），讨论了溶液pH值、nZVI质量浓度、接触反应时间和温度对去除效果的影响，并从nZVI对U （Ⅵ）的还原角度探讨了还原动力学规律。研究结果表明：nZVI对溶液中的U （Ⅵ）有很好的去除效果，其去除过程包括还原沉淀和吸附，其中还原过程符合准一级还原动力学模型；溶液pH值对去除效果有明显的影响，在溶液pH值为5.0时，去除率达到最大值96.27％。温度对去除效果有一定的影响，表观速率常数 kobs随反应温度的升高而增大，还原速率与反应温度的关系符合Arrhenius定律，反应活化能 Ea 为16.54 kJ/mol ，低于一般化学反应的活化能（60～250 kJ/mol），表明该反应较易进行。

英文摘要：

Nanoscale zero-valent iron （nZVI ） , synthesized in aqueous solution by reduction method ,was used to remove U （Ⅵ ） from aqueous solution .The effects of pH ,nZVI concentration , contact time and temperature on removal of U （Ⅵ ） were investigated and the reduction kinetics law on reduction of U （Ⅵ ） by nZVI was discussed .The results show that nZVI has very good removal efficiency on U （Ⅵ） ,and the removal process contains reduction precipitation and sorption .T he reduction process follows the pseudo first order reduction kinetics model .The solution pH has evident effect on removal efficiency ,and the maximum removal rate reaches 96.27% at pH=5.0 .The temperature has a certain influence on removal efficiency ,the apparent rate＆amp;nbsp;constant kobs increases with the temperature ,and the relationship between the reduction rate and the reaction temperature accords with Arrhenius law .The reaction activation energy is 16.54 kJ/mol w hich is below ordinary chemical reaction activation energy （60-250 kJ/mol） ,w hich indicates that the reaction is easy to take place .