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半导体光催化技术可应用于环境中污染物的降解、转化和矿化以及太阳能的转换,是解决环境污染和能源短缺问题的一条有效途径。石墨相氮化碳(g-C_3N_4)与Bi系化合物复合材料因具有优异的光催化性能成为新型光催化材料的研究热点。本文论述了目前g-C_3N_4的主要制备方法,g-C_3N_4与Bi系复合材料的种类及其制备过程;同时围绕g-C_3N_4和Bi系复合催化材料在环境净化中的应用,包括对水体中污染物的降解及去除、光致细菌失活和光致水解产氢等,综述了国内外近年来的重要研究进展;以去除水环境中有机污染物为例,详细阐述了水体中有机污染物的光催化降解机理。最后,对g-C_3N_4与Bi系复合光催化材料的开发和应用前景进行了展望。
Semiconductor photocatalytic technology can be applied to the degradation, conversion and mineralization of pollutants in the environment and the conversion of solar energy, which is an effective way to solve the problem of environmental pollution and energy shortage. Graphite carbonitride (g-C_3N_4) and Bi-based compound have attracted much attention due to their excellent photocatalytic properties. In this paper, the main preparation methods of g-C_3N_4, the types of g-C_3N_4 and Bi-based composite materials and their preparation process are discussed. The application of g-C_3N_4 and Bi-based composite catalytic materials in environmental purification, including the pollution of water Biodegradation and removal of biodegradable materials, deactivation of photobiotics and photodegradation of hydrogen, the important research progress at home and abroad in recent years is reviewed. Taking organic pollutants in water as an example, the light of organic pollutants in water Catalytic degradation mechanism. Finally, the prospects for the development and application of g-C_3N_4 and Bi-based composite photocatalysts are prospected.