凹凸棒土对Cr(Ⅵ)的吸附去除研究进展  

Research Progress on Adsorption and Removal of Hexavalent Chromium by Attapulgite

作　　者：陈文[1,2] 周嫄 朱霞萍[1,2] CHEN Wen;ZHOU Yuan;ZHU Xiaping(College of Materials and Chemistry&Chemical Engineering,Chengdu University of Technology,Chengdu610059,China;Mineral Resources Chemistry Key Laboratory of Sichuan Higher Education Institution,Chengdu 610059,China)

机构地区：[1]成都理工大学材料与化学化工学院,成都610059 [2]矿产资源化学四川省高校重点实验室,成都610059

出　　处：《四川轻化工大学学报（自然科学版）》2023年第6期17-25,共9页Journal of Sichuan University of Science & Engineering(Natural Science Edition)

基　　金：国家自然科学基金地区项目(42267007);江苏省凹土资源利用重点实验室开放基金项目(HPK202201)。

摘　　要：重金属铬作为五毒元素之一,其Cr(Ⅵ)是毒性最强的价态离子,一般以Cr_(2)O_(7)^(2-)、CrO_(4)^(2-)、HCrO_(4)^(-)等形式存在,其在废水中的去除成为研究的热点。凹凸棒土(ATP)是一种具有链层状结构的含水富镁铝硅酸盐粘土矿物,沿结构纤维方向存在大量微孔,具有大的比表面积、表面存在多种活性基团以及多余电荷等特质,被广泛应用于重金属的吸附去除。由于天然ATP容易团聚为晶束并含有较多杂质,且带有负电荷,因而对Cr(Ⅵ)的吸附性能不理想,常需通过各种改性以提高其吸附去除率。本文重点介绍了近期国内外有关ATP及其改性材料对Cr(Ⅵ)的去除研究进展,对新型吸附剂的研究提出展望,为后续天然ATP的改性研究及吸附重金属铬的综合利用提供有益的参考。Heavy metal chromium is taken as one of the five most toxic elements,and Cr(Ⅵ)is the most toxic valence ion and generally exists in forms of Cr_(2)O_(7)^(2-)、CrO_(4)^(2-)、HCrO_(4)^(-)and so on.The removal of hexavalent chromium in wastewater has become a research hot topic.Attapulgite(ATP)is a natural hydrous magnesium-rich aluminosilicate clay mineral with chain layered structure.There are large numbers of micropores along its structural fiber direction.ATP has the characteristics of large specific surface area,a variety of active groups on the surface and excess charge,which is widely used for the adsorption and removal of heavy metals.As natural ATP is easy to agglomerate into crystal bundles,contains more impurities,and shows a negative charge ability,the adsorption performance of hexavalent chromium is unsatisfactory.Therefore,various modifications are often needed to improve its adsorption and removal rate of Cr(Ⅵ).In order to provide a useful reference for the subsequent modification of natural ATP and the comprehensive utilization of adsorbed heavy metal chromium,the current research progress on the removal of Cr(Ⅵ)by ATP and its modified materials at home and abroad is summarized in the paper.Besides,the prospect of the research of new adsorbents is put forward.

关 键 词：凹凸棒土 Cr(Ⅵ) 吸附 改性 

分 类 号：TQ424.2[化学工程] X703[环境科学与工程—环境工程]