纳米铁还原固定铼的动力学  

Kinetics of Reduction-Immobilization of Rhenium by Iron Nanoparticles

作　　者：杨帆[1] 钱天伟[1] 丁庆伟[1] 刘宏芳[1] 

机构地区：[1]太原科技大学,山西太原030024

出　　处：《核化学与放射化学》2011年第5期280-284,共5页Journal of Nuclear and Radiochemistry

基　　金：国家自然科学基金资助项目(No.41072265);山西省国际科技合作计划资助项目(No.2010081021);山西省留学回国人员科技项目(No.200971);山西省高校科技研究开发项目(No.20081028;20091022);山西省青年科学基金资助项目(2009021007-3)

摘　　要：为了解纳米铁还原固定铼的动力学性质,实验中采用了液相还原法制备纳米铁,在不同浓度、温度和pH下对纳米铁降解ReO4-的反应动力学进行研究,从而进一步为纳米铁处理锝提供依据。纳米铁还原铼的反应可能为:2ReO4-+2Fe0+2H+→2ReO2+Fe2O3+H2O,还原反应符合准一级反应,满足阿伦尼乌斯(Arrhenius)公式,其表观活化能为5.13kJ/mol。在pH为中性或微酸、微碱性时,纳米铁还原铼的处理效果较好。The kinetic property of reduction-immobilization of rhenium by iron nanoparticles, which may be a functional reagent for the treatment of technetium-containing waste, was investigated under different Re concentration, different temperature, and different pH by using iron nanoparticles freshly prepared by liquid phase reduction method. The involved overall reaction might be written as 2ReO-4 ＋2Fe^0＋2H＋→2ReO_2＋Fe_2O_3＋H_2O, conforming to pseudo first-order kinetics. The reaction process obeys Arrhenius formula with the apparent activation energy of 5.13 kJ/mol. The treatment of Re with iron nanopartilces will be most effective under neutral, slightly acidic, or slightly alkaline reaction medium.

关 键 词：铼 锝 纳米铁 反应动力学 

分 类 号：X771[环境科学与工程—环境工程]