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.
出处
《湖南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
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
关键词
活性炭负载纳米零价铁(nZVI
AC)
溴酸盐
吸附
还原
nanoscale zero-valent iron supported on activated carbon （nZVI/AC）
bromated
absorbed
reduction
