黏土负载纳米零价铁复合材料去除污染物研究进展  

Research Progress in Removal of Contaminants by Clay-supported Nanoscale Zero-valent Iron Composites

作　　者：吕瑛[1] 李益民[1] LYU Ying;LI Yimin(School of Chemistry and Chemical Engineering,Shaoxing University,Shaoxing,Zhejiang 312000)

机构地区：[1]绍兴文理学院化学化工学院,浙江绍兴312000

出　　处：《绍兴文理学院学报》2018年第7期34-45,共12页Journal of Shaoxing University

基　　金：国家自然科学基金项目"表面活性剂协同矿物结合Fe(II)还原硝基苯类化合物的作用机制"(21477081)

摘　　要：纳米零价铁(NZVI)比表面积大、表面活性位点丰富、反应活性高,在环境污染物处理中显示出优异的应用前景.但纳米铁高的表面能和铁的固有磁性,使其易团聚,且难以分离回收,从而制约了它的更广泛应用.黏土矿物来源广泛、价格低廉、性质稳定、环境相容性好,与其他负载材料比较,黏土还具有缓冲介质p H、结构-功能可调、易于改性的特点,可根据目标污染物的性质制备合适的改性黏土,以充分发挥载体效应,提高纳米铁对目标污染物的去除效率和选择性.黏土的存在还能部分转移零价铁表面的钝化产物、提高其重复使用性、延长反应寿命,还能提高单位铁量对污染物的去除容量.Nano-scale zero-valent iron(NZVI)bearing a large specific surface area,abundant surface active sites and high reactivity will be widely applied in the treatment of environmental pollutants.However,NZVI is easy to be agglomerated,but difficult to be separated and recycled because of its high surface energy and inherent magnetism,which hinders its wider application in treating environmental contaminants.Clay minerals are ubiquitous,cheap,stable and good in environmental compatibility.Compared with other supported materials,clay is characterized as easy pH buffering,adjustable structure function and easy modification.So clays can be suitably modified according to the properties of target pollutants so that they can make full use of their support effects and improve the efficiency and selectivity of NZVI in the removal of target pollutants.Moreover,the formed passive products can also be partially transferred from the surface of NZVI to the clays,which further improve the reusability and longevity of NZVI,and hence the greater removal capacity of NZVI to pollutants in per unit iron.

关 键 词：黏土 零价铁 复合材料 去除 污染物 

分 类 号：X506[环境科学与工程—环境工程]