关键词: 环境, 能源, 光电催化, Au/TiO₂, 复合材料, 改性策略

Abstract:

Recently, the environmental pollution and energy depletion problems are becoming more and more serious, which have restricted the human survival and development. Using photocatalytic technique, the degradation of pollutants and preparation of clean energy can be achieved, which help to reduce the environmental pollution and curb the energy depletion. Titanium dioxide (TiO₂) is one of the most studied materials in photocatalysis area, due to many advantages including excellent photoactivity, stable, cheap and environment friendly. However, the intrinsic defects existing in TiO₂ still restrict its further application. The researchers have proposed a variety of ways for the modification of TiO₂. For example, precious metals/TiO₂ composites can significantly improve the photoactivity and broaden the absorption wavelength range of TiO₂. Especially, Au/TiO₂ composite has been widely studied, which shows a promising prospect of applications in many areas. In this review, the development of Au/TiO₂ composites in recent years is summarized. Firstly, the chemical properties of Au and TiO₂, and the optical enhancement principle of Au/TiO₂ composites are briefly introduced. Then, the modified strategy and related mechanism of Au/TiO₂ composites are well discussed, including Au regulation effect on the optical properties of TiO₂, and the selective modification methods and techniques. Finally, the current status of Au/TiO₂ composites are still dominated by overcoming the two major intrinsic defects of TiO₂, and it is expected that various new Au/TiO₂ composites can be gradually promoted and applied.

Key words: environment, energy, photoelectrocatalysis, Au/TiO₂, composites, modified strategy