纳米TiO2/天然矿物复合材料的环境效应

本文系统论述了国内外有关纳米TiO2/矿物复合材料的研究和应用现状,重点介绍了负载纳米TiO2的矿物种类及其复合材料在环境科学研究中的应用。分别介绍了氧化物、层状硅酸盐、架状硅酸盐和硅藻土,重点论述了层状硅酸盐类。纳米TiO2/矿物复合材料主要应用于降解有机污染物(如有机染料、苯酚、甲基橙、亚甲基蓝、邻氯苯酚、DDVP、HCH、DDT、DDE、DDD、反式氯丹和顺式氯丹等),将其变为H2O、CO2等无害小分子化合物,不产生二次污染。纳米TiO2/天然矿物复合材料对污染物的降解效果优于单相TiO2,在环境方面的应用很有潜力。

The Environmental Effect of Compound Material Consisting of Nanometer Sized TiO2 and Natural Minerals

This paper has systematically summarized the present situation of study and application of compound materials consisting of nanometer sized TiO_2 and natural minerals and emphatically introduced types of minerals carrying nanometer sized TiO_2 and the environmental applications of the compound material.Four types of minerals including oxides,sheet silicates, framework silicates and diatomite have been discussed.The sheet silicates have been especially discussed.The compound material consisting of nanometer sized TiO_2 and natural minerals is mainly applied for degrading organic pollutants(such as organic dye,phenol,methyl orange,methylene blue,2-chlorphenol,DDVP,HCH,DDT,DDE,DDD,trans-and cis-chlordane etc.) to unharmful and intoxic small molecule compounds(such as carbon dioxide and water) without secondary pollution.The degradation effect of the compound material consisting of nanometer sized TiO_2 and natural minerals is better than that of the TiO_2 itself.Thus,this compound material has very good potential for environmental application.