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利用光催化剂表面的光生电子或空穴等活性物种 ,通过还原或氧化反应去除水相中的金属离子 ,是与环境保护、贵金属回收或金属担载催化剂制备相关的重要过程。笔者结合半导体的结构特征 ,综述了利用光催化还原反应或氧化反应 ,对铬、汞、铜、镍、银及铂、钯等贵金属和锰、铀等的光催化去除效果 ,介绍了该技术在处理金属离子混合体系实现金属分离过程的应用。结合有关实验数据 ,对一些可能反应机制进行了探讨。对与环境保护及其它相关工艺过程的应用进行了介绍。
The use of active species such as photo-generated electrons or holes on the photocatalyst surface to remove metal ions in the aqueous phase through reduction or oxidation reactions is an important process associated with environmental protection, precious metal recovery or metal-supported catalyst preparation. Combined with the structural characteristics of the semiconductor, the photocatalytic removal of chromium, mercury, copper, nickel, silver, platinum, palladium and other precious metals and manganese and uranium by photocatalytic reduction reaction or oxidation reaction are reviewed. Application of Metal Ion Mixing System in Metal Separation Process. Combined with relevant experimental data, some possible reaction mechanisms are discussed. The application of environmental protection and other related processes are introduced.