高岭土的改性及其从含砷水中除砷性能研究  

Study on modification of kaolin and its properties of removing arsenic from water

作　　者：刘建[1] 闫英桃[1] 王慧[1] 

机构地区：[1]长安大学环境科学与工程学院,陕西西安710054

出　　处：《应用化工》2009年第8期1100-1104,共5页Applied Chemical Industry

基　　金：国家自然科学基金资助项目(50679003)

摘　　要：以高岭土为原料通过碱熔合成得到类似于分子筛的笼状骨架结构，并将Fe^3＋通过离子交换吸附，负载在其骨架上，实现改性；利用改性后的吸附剂具有大的活性表面积，以及砷阴离子（AsO4^3-）与Fe^3＋的强配位能力，实现了基于配体交换的固液分离的从微量含砷水中去除砷。实验表明，改性高岭土除砷材料具有良好的吸附除砷性能，在含As（V）5—40mg／L的水中，在实验条件下平衡除砷率可达99％以上。经测定，该材料对As（V）的吸附量可达3．7mg／g除砷剂以上，并具有水中常见共存离子不影响砷的去除效果，以及不对水体产生二次污染等特点。处理后的水的砷含量可达到国家饮用水标准甚至更低。获得一种新的从饮用水源中去除砷的方法。By using kaolin as saw material to prepare a clathrate framework of zeolite-like through alkali refining and Fe^3＋ fixed on the framework by ion exchange, the properties of the kaolin can be modified to some extent. It was discovered that this modified kaolin had ideal capability of removing arsenic from water because of its giant active surface and coordinate action, intensify, for arsenate ions （AsO4^3-） and Fe^3＋ fixed on the framework, and achieving the aim of removing the minimal content of arsenic from the water. The results indicate that in the water contenting about 5 - 40 mg/L arsenic [ As （V） ], the efficiency of equilibrium removing arsenic could reach over 99% under condition of the testing. It was determined that the static saturation adsorbing capacity can reach 3.7 mg As（ V）/g. Meanwhile the test result shows that common-ions in water do not influence the effect of removing arsenic, in addition, this method does not bring on secondary pollution into the water. A new remarkable method of removing the deleterious arsenic from the resource of drinking water was got.

关 键 词：改性高岭土 含砷水 除砷 

分 类 号：TU991.2[建筑科学—市政工程]