稀土上转换用于提高半导体化合物光催化效率的研究进展

Research progress of rare earth upconversion used for improving the photocatalytic efficiency of semiconductor compounds

半导体光催化剂的最大不足在于对可见光和红外光的吸收不够,转化效率低.因此,如何设计合成能够吸收太阳光中的可见光和红外光的光催化剂是这几十年来国内外研究的重点.重点讨论利用一些稀土离子的上转换发光特征,通过掺杂来合成具有高的光吸收效率和光催化性能的催化剂.分别归纳、总结和分析了近年来稀土上转换用于改性传统半导体光催化剂,如钛基、锌基、铋基、银基、镉基和钡基光催化剂的制备和应用.比较了稀土上转换剂把可见光及近红外光转换为紫外光供光催化剂吸收利用以提高对太阳能的利用效率的研究进展,尤其是在提高光催化剂催化活性方面的贡献大小和机理.

The main problem of the semiconductor photocatalyst is that the absorption of visible light and infrared light is not enough, and the conversion efficiency is low. Therefore, how to design and synthesize the photocatalyst that can absorb visible light and infrared light in the sunlight is the focus of the research in the past few decades. In this paper, we focused on the upconversion luminescence characteristics of some rare earth ions, and the catalyst synthesized by doping with high light absorption efficiency and photocatalytic performance. The paper summarized and analyzed the preparation and application of titanium, zinc, bismuth, silver, cadmium and barium based optical catalyst system used to change the traditional semiconductor photocatalyst in recent years. The research progress of the rare earth upconversion agents converting visible light and near infrared light into ultraviolet for light absorbed by the catalyst used to improve the utilization efficiency of solar energy was compared, especially in improving the contribution and mechanism of the photocatalytic activity.