羟基铝柱撑膨润土负载纳米铁还原Cr(Ⅵ)  

Reduction of Chromium(Ⅵ) by Nanoscale Zero-Valent Iron Supported on Al-Pillared Bentonite

作　　者：尹丽京[1] 李益民[1] 张璐吉[1] 彭远飞[1] 应哲兰[1] 

机构地区：[1]绍兴文理学院化学系,绍兴312000

出　　处：《环境科学》2009年第4期1055-1059,共5页Environmental Science

基　　金：浙江省自然科学基金项目(Y506288);绍兴市科技计划项目(2006A32004)

摘　　要：用具有良好吸附能力的羟基铝柱撑膨润土作载体,通过FeSO4与NaBH4反应制得羟基铝柱撑膨润土负载的纳米铁(nanoscale zero-valent iron supported on Al-pillared bentonite,NZVI/Al-PILC).用X射线衍射(X-ray diffraction,XRD)(、Brunauer-Emmett-Teller,BET)法对NZVI/Al-PILC进行了结构表征.以Cr(Ⅵ)为目标污染物,考察了NZVI/Al-PILC与Cr(Ⅵ)反应过程中,介质pH、不同起始浓度的Cr(Ⅵ)对其去除率的影响,并与相同铁含量的纳米铁(nanoscale zero-valent iron,NZVI)进行了比较.结果表明,在相同实验条件下,Cr(Ⅵ)与NZVI/Al-PILC反应120 min后去除率接近100%,不仅高于相同铁含量NZVI对Cr(Ⅵ)去除率(63.0%),而且也明显优于相同铁含量的NZVI和相同含土量的羟基铝柱撑膨润土对Cr(Ⅵ)去除率的加和(75.4%).In the presence of Al-pillared bentonite with good sorption capacity, nanoscale zero-valent iron supported on Al-pillared bentonite （NZVI/Al-PILC） was prepared with NaBH4 and FeSO4 aqueous solution. The structure of NZVI/Al-PILC was characterized by X-ray diffraction （XRD） and Brunauer-Emmett-Teller （BET）. The effects of pH values and initial chromium（ Ⅵ ） concentrations on its removal rate by NZVI/ Al-PILC were investigated, and were compared with those of unsupported nanoscale zero-valent iron （NZVI） containing the same iron mount of NZVI/Al-PILC. The results indicate that in the same experimental condition, the chromium（ Ⅵ ） removal by NZVI/Al-PILC reached 100% after 120 min. The removal is not only much higher than that （63.0%） of the NZVI containing same iron mount, but also superior to the sum of removal （75.4%） by NZVI containing the same iron amount and the Al-pillared bentonite containing the same clay amount with NZVI/Al- PILC.

关 键 词：负载纳米铁 羟基铝柱撑膨润土 Cr(Ⅵ) 还原 协同作用 

分 类 号：X703.1[环境科学与工程—环境工程]