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在繁杂多变的催化剂之中,作为最早应用于解决能源和环境问题的半导体光催化剂,TiO_2因其高活性、性质稳定、廉价易得、安全无毒等优势如今依旧耀眼。得益于70年代开始不断进步的纳米技术,TiO_2纳米粒子、纳米棒、纳米管等具备纳米效应的光催化材料以不同方法被制备,TiO_2的光催化活性得到了很大改善。本文将基于改性纳米TiO_2的机理,结合影响改性纳米TiO_2可见光催化性能的因素分析,从离子掺杂、贵金属沉积和半导体复合三个实验途径,提升了改性纳米TiO_2可见光催化活性与性能。
Among the complex and ever-changing catalysts, TiO 2, as the earliest semiconductor photocatalyst to solve energy and environmental problems, is still dazzling due to its high activity, stable properties, low price and easy availability, safe and nontoxic. Benefiting from the progress of nanotechnology in the 1970s, photocatalytic materials such as TiO 2 nanoparticles, nanorods and nanotubes with nanometer effect were prepared by different methods and the photocatalytic activity of TiO 2 was greatly improved. Based on the mechanism of modification of nano-TiO 2 and the analysis of the factors affecting the visible light photocatalytic activity of the modified nano-TiO 2, the photocatalytic activity and performance of the modified nano TiO 2 were improved by three experimental approaches: ion doping, noble metal deposition and semiconductor recombination.