纳米光催化氧化降解染料污染物的进展

The Developments of Nano-photocatalytic Degradation in Dye Pollution

综述了近年来利用TiO2光催化降解染料污染物的进展。从光催化反应的主要影响因素、染料分子的断裂途径及染料的分解机理几个方面进行了系统阐述。目前TiO2是应用最为广泛、催化效果最好的半导体光催化剂:pH值对光催化降解的影响主要依赖于目标污染物的化学结构及其性质:通常,一些外加的电子捕获剂可加快光催化反应的进行:表面活性剂的加入对光催化降解也有影响,会决定染料的溶解、分散及吸附,一般可加速反应进行:温度对反应的影响并不显著。有26篇参考文献。

The developments of photocatalytic oxidative degradation of dye pollutants in the presence of TiO2 were reviewed with 26 references. The major factors of photocatalytic reaction, destructive pathway of dye molecules as well as the degradation mechanism of dyes were discussed. Of all the catalysts, TiO2 was the best and widely used for investigation and development. Effects of pH on photocatalysis depend on the chemical constitution and physico-chemical properties of the dye pollutants. Usually, the addition of photoexcited-electron scavenger could greatly accelerate the rate of photocatalytic degradation. Surfactants would also provide certain influences on photocatalysis because of its amphophilicity (hydrophilic and lipophilic) of the surfactant, and consequently, it would play an important role for the determination of dissolution, dispersion and adsorption of dyes. Reaction temperature had little effect on Photocatalytic rate.