Abstract: The semiconductor photocatalyst is an ideal material for environmental pollution treatment because it can directly use solar light for photocata-lysis without secondary pollution. Among them, TiO2 photocatalyst has been widely studied and paid attention to because of its high light stability, good chemical properties, non-toxicity, low cost and high photocatalytic efficiency. However, the rapid recombination of electron-holes of TiO2 leads to a lower quantum yield, which limits its photocatalytic performance. Moreover, because of the large forbidden band width of TiO2 photocatalyst, its electrons can only be excited under ultraviolet light, and the utilization rate of solar energy is relatively low, which limits its application under visible light. Therefore, in recent years, the photocatalytic performance has been improved by studying the doping of TiO2 with different metal elements and the metal doped TiO2-based photocatalyst with special micro/nano structure, and has made great progress. It is found that the doping of metal elements reduces the recombination rate of TiO2 electron-holes, narrows the forbidden band width of TiO2, and increases the photoresponse range, thereby enhancing the photocatalytic performance and expanding its application prospect under visible light. In addition, the researchers found that the existence of special micro-nanostructures can accelerate the electron transfer of metal-doped TiO2-based composites, thus increasing the separation efficiency of TiO2 photogenerated electron-holes and increasing their quantum yield. After metal doping, TiO2 has significantly improved the degradation rate of organic matter, hydrogen production capacity and light energy conversion rate, and its antibacterial effect and anti-fog performance have also been significantly improved. On the one hand, this paper reviews the changes of TiO2 structure and photocatalytic properties of different metal doping systems including single element, binary composite and multi-component doping. The effects of different preparation processes on structure and properties are summarized, and the enhancement mechanism of photocatalytic performance is analyzed. On the other hand, preparation processes on some special micro-nano structures of metal-doped TiO2-based composites, including graphene cladding structure, core-shell structure and other structures, are discussed. Different micro-nano structures and metal doping for enhanced photocatalysis are discussed. Finally, the different applications of different metal doped TiO2 nanocomposites are briefly reviewed, and the future research directions and application fields are prospected.
李大玉, 张文韬, 张超. 不同种类金属掺杂改性TiO2材料光催化性能的研究进展[J]. 材料导报, 2019, 33(23): 3900-3907.
LI Dayu, ZHANG Wentao, ZHANG Chao. Research Progress in Improving the Photocatalytic Properties of TiO2 Materialsby Doping with Different Metals. Materials Reports, 2019, 33(23): 3900-3907.
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2019, Vol. 33 
