TiO2光催化去除废水中重金属离子的研究进展

Research progress in the removal of heavy metal ions from wastewater by TiO_2 photocatalysis

半导体非均相光催化技术在环境治理与净化方面越来越受到人们的重视。概述了半导体TiO2光催化去除废水中重金属离子的机理,从光催化还原角度综合分析了废水中4种主要重金属离子Cr(Ⅵ)、Hg(Ⅱ)、Pb(Ⅱ)、Ag(Ⅰ)的光催化去除特性及其影响因素,进一步加深了对TiO2光催化本质规律的认识,最后讨论了TiO2光催化技术存在的问题和今后的发展趋势。

More and more attention has been paid to environmental governance and purification by semiconductor heterogeneous photocatalysis. An overview is given on the mechanism of TiO2 photocatalytic removal of heavy metal ions. From the angle of photocatalytic reduction, the removing characteristics of photocatalysis of four primary heavy metal ions Cr （ Ⅵ ）, Hg （ Ⅱ ） ,Pb （ Ⅱ ） ,Ag （ Ⅰ ）, and their influencing factors are summarized and analyzed. Further understanding on the essential disciplinarian of TiO2 photocatalysis is obtained. At the end, the problems existing in TiO2 photocatalytic technique and the trend of its future development are discussed.