银/卤化银:一类新型等离子体光催化剂

Ag/AgX(X=Cl,Br,I): A New Type Plasmonic Photocatalysts

半导体光催化氧化技术在环境保护方面具有突出的优点和很强的潜在应用价值,是当前环境净化处理的前沿研究课题之一。贵金属纳米结构的表面等离子体共振效应使之在可见区能够表现出明显的特征吸收,这为可见光驱动的光催化剂的研究提供了新的实践空间和契机。近年来的研究显示:在太阳光或可见光的驱动下,基于银/卤化银(Ag/AgX,X=Cl,Br,I)的复合物对有机污染物的光降解表现出了优良的催化性能,且该类催化剂具有良好的稳定性。随着相关研究的进一步深入和拓宽,积累了丰富的研究成果,形成了一个新的研究方向,也为有机污染物的光降解提供了新的机遇。本文对该类新型表面等离子体光催化剂的工作机制、制备方法、催化活性等方面的研究进展进行了总结和概述。此外,文中还简单论述了该类催化体系在其他前沿领域的研究进展。同时,亦对该方向存在的问题和发展前景做了总结和展望。

Currently, photocatalytic oxidation of organic pollutants under visible light illumination has become one of the most important subjects in the field of photocatalysis. This is owing to its intimate relationship with the environmental issues and energy saving. Generally, due to their surface plasmon resonance （SPR） absorptions, nanostructured noble metals could display distinct absorptions in the visible light region. This practically opens up new opportunities and avenues for the development of visible-light-driven photocatalysts. It has recently been demonstrated that Ag/AgX （X = C1, Br, I） based plasmonic photocatalysts could display excellent and stable photocatalytic performance for the photodegradation of organic pollutants under sunlight or visible-light irradiations. In the past few years, great progress have been achieved with regard to this kind of new type visible-light-driven plasmonic photocatalysts. In this review, we would like to highlight the recent progress concerning the Ag/AgX based plasmonic photocatalyst. The main content of this review includes： （i） the mechanism of the Ag/AgX based plasmonic photocatalyst; （ii） the fabrication of the Ag/AgX based plasmonic photocatalyst; and （iii） photocatalytic performance of the Ag/AgX based plasmonic photocatalyst. At the end of this review, the prospects and problems of this kind of plasmonic photocatalysts are also addressed briefly.