活性炭负载纳米零价铁去除溴酸盐的研究  

Removal of Bromate Using Nanoscale Zero-valent Iron Supported on Activated Carbon

作　　者：杨麒[1] 伍秀琼 钟宇[1] 李小明[1] 邓晓[1] 李娜[1] 

机构地区：[1]湖南大学环境科学与工程学院,环境生物与控制教育部重点实验室,湖南长沙410082

出　　处：《湖南大学学报（自然科学版）》2013年第12期97-102,共6页Journal of Hunan University:Natural Sciences

基　　金：国家自然科学基金资助项目(51078128);国际科技合作项目(2011DFA90740,2012DFB30030-03);湖南大学青年教师成长计划项目

摘　　要：实验采用液相还原法制备活性炭负载纳米零价铁材料(nZVI/AC),并利用X射线衍射(XRD)、扫描电镜(SEM)和透射电镜(TEM)等对其结构进行表征.考察了不同反应条件下nZVI/AC对BrO3-的去除效率,并研究其去除机理.结果表明nZVI/AC具有很高的表面反应活性,且nZVI和活性炭(AC)之间存在协同作用.BrO3-的去除效率随pH值的减小而增大,共存离子NO3-和SO42-对其去除率影响不大但降低了去除速率.机理分析表明BrO3-被nZVI/AC吸附而使局部BrO3-浓度升高,并被nZVI迅速还原为无毒的Br-.Nanoscale zero-valent iron supported on activated carbon （nZVI/AC） was synthesized in liquid phase reduction method.The nZVI/AC was characterized through X-ray diffraction （XRD）,scanning electron microscope（SEM） and transmission electron microscope （TEM）.The removal of BRO3-with nZVI/AC under different conditions and the removal mechanisms were assessed.The results showed that nZVI/AC displayed high reactivity to BrO3-,which should be attributed to the synergetic adsorption and reduction ability of AC and nZVI.The removal efficiency of bromate increased as initial pH decreased.NO3-and SO42-had little effect on BrO3-removal,but could decrease the removal rate.The BrO3-removal mechanism indicated that bromate in aqueous solution was adsorbed onto nZVI/MAC,which led to the increase of local bromate concentration in the vicinity of iron nanoparticles,and subsequently reduced to innocuous bromide rapidly with nZVI.

关 键 词：活性炭负载纳米零价铁(nZVI AC) 溴酸盐 吸附 还原 

分 类 号：X703[环境科学与工程—环境工程]