关键词: 氮化碳, 催化剂, 太阳能, 制氢, 降解

Abstract: Polymeric graphitic carbon nitride，g-C3N4，is a new organic photocatalyst with semiconductor property and proper band gap of 2.7eV，which possesses high thermal and chemical stability. In this paper，the structure，physicochemical properties and preparation methods of g-C3N4 are reviewed. As the photocatalytic activity of g-C3N4 is generally low，the methods to make it an effective photocatalyst are summarized，including texture modification，elements doping and constructing heterojunction with other materials，copolymerization and sulfur-mediated function. In addition，the applications of g-C3N4 for photocatalytic water splitting and degradation of organic water pollutants under visible light are discussed. At the end，it can be concluded that the developing tendency of g-C3N4 as a photocatalyst is exploring and further optimizing the preparation and modification methods to improve its photocatalytic activity.

Key words: carbon nitride, catalyst, solar energy, hydrogen production, degradation