原子能科学技术Issue(1)：7-13,7.DOI:10.7538/yzk.2014.48.01.0007
纳米零价铁去除溶液中 U（Ⅵ）的还原动力学研究
Reduction Kinetics of U (Ⅵ) in Aqueous Solution by Nanoscale Zero-valent Iron
摘要
Abstract
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 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 .关键词
纳米零价铁/铀/动力学/还原/表观速率常数Key words
nanoscale zero-valent iron/uranium/kinetics/reduction/apparent rate constant分类
资源环境引用本文复制引用
李小燕,刘义保,张明,李寻,刘云海,花榕..纳米零价铁去除溶液中 U（Ⅵ）的还原动力学研究[J].原子能科学技术,2014,(1):7-13,7.基金项目
国家自然科学基金资助项目（11205030，41201500）；核资源与环境省部共建国家重点实验室培育基地项目资助（101111）；放射性地质勘探与技术国防重点学科实验室项目资助 （）
