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

摘要： 石墨型氮化碳（g-C3N4）聚合物是一种具有合适禁带宽度（2.7eV）的新型非金属有机半导体光催化剂，它具有良好的热稳定性和化学稳定性。本文介绍了石墨型氮化碳的结构、理化性质和合成方法，重点阐述了进一步提高石墨型氮化碳光催化活性的方法，包括形貌调控、掺杂改性、共聚合改性和硫介质调控。并论述了石墨型氮化碳在可见光下催化分解水和降解有机污染物方面的应用现状。最后指出进一步探索和优化石墨型氮化碳的合成及改性方法，提高其光催化性能依然是g-C3N4在光催化领域应用的研究重点。

关键词: 氮化碳, 催化剂, 太阳能, 制氢, 降解