零价纳米铁还原Tc(Ⅶ)的动力学研究  

Dynamic of Reduction of Tc(Ⅶ) with ZVI Nanoparticles

作　　者：丁庆伟[1] 钱天伟[1] 杨帆[1] 刘宏芳[1] 王莉霄 赵东叶 

机构地区：[1]太原科技大学环境与安全学院,山西太原030024 [2]奥本大学土木工程系,美国奥本al36849

出　　处：《中北大学学报（自然科学版）》2012年第3期320-323,共4页Journal of North University of China(Natural Science Edition)

基　　金：国家自然科学基金资助项目(41072265);山西省国际科技合作计划(2010081021);山西省留学回国人员科技项目(200971);山西省高校科技研究开发项目(20081028;20091022);山西省青年科学基金资助项目(2009021007-3)

摘　　要：以元素铼替代放射性元素锝,对核废物中Tc(Ⅶ)的还原固定进行了理论推导和实验研究,通过热力学和动力学理论计算研究了零价纳米铁还原固定土壤中TcO-4的价态以及反应的难易和反应程度.采用尝试法和MATLAB拟合等不同方法对纳米铁还原固定锝的动力学进行了分析.研究结果表明:实验结果与理论计算结果一致,该反应为准一级反应,产物形态为TcO2,可以有效固定TcO-4.纳米铁参与反应时,适当的粒径对反应的影响是显著的.Reductive immobilization of Tc(Ⅶ) in radioactive waste were studied with theoretical analysis and experiment,in withch radioactive technetium was replaced by rhenium.Through the theoretical calculation of thermodynamic and dynamic,the difficulty degree and valence state of reaction of zerovalent iron(ZVI) nanoparticles reducing TcO-4 were studied.The dynamic of rhenium's reduction and immobilization were analyzed by trial-and-error method,fitting method and other methods.The experimental results were consistent with the theoretical calculations,which indicated that reduction and immobilization of technetium by ZVI nanoparticles in soil followed pseudo first order reaction with the production of TcO2.TcO-4 was immobilized.The particle of certain size significantly influences the reaction.

关 键 词：锝 铼 纳米铁 

分 类 号：X131[环境科学与工程—环境科学]