Abstract: Graphene, an atomic thick nanosheet of covalently organized two-dimensional lattice of sp2 bonded carbon atoms, has recently received tremendous attention as a hot point in the field of new photocatalytic materials. Of particular interest is its efficient charge conductivity in electron-transfer process and large theoretical specific surface area. Thus, graphene has been seen as an ideal substituent of carbon nanotubes with photocatalysts to improve photocatalytic performance. Herein the research achievements on photocatalytic reactions based on grapheme are reviewed. Five factors impacting the photocatalytic efficiency of semiconductors are first analyzed. They are the bandgap, the position of the energy band, the recombination probability of the excited electon/hole pair, the crystallinity of the photocatalyts and the absoptive capacity of the photocatalyts. Then, the fundamental mechanism of enhanced photocatalytic activity is discussed, and the advance in compositing method, coating method, and self-photocatalytic reactions of grapheme to adjust the bandgap of the photocatalyts is summarized. At the end, the evidence from both theory and experiment of regulating the bandgap is presented.

Key words: photocatalysis, graphene, compositing, coating

摘要： 石墨烯是近年来人们发现和合成的一种新型二维平面纳米材料，由于其优良的导电性能和巨大的比表面积，研究者们用石墨烯与光催化材料复合，改善其光催化性能，这已成为新型光催化材料的研究热点之一。本文阐述了近年来国内外对于石墨烯在光催化反应中应用的研究动态和主要成果，分析了影响半导体材料光催化效率的5个因素，即禁带宽度、能带位置、激发电子-空穴复合概率、光催化剂结晶性和光催化剂吸附性能。介绍了石墨烯提高光催化效率的方法，重点介绍了石墨烯在复合、包覆和自身参与光催化反应3个方法中的具体应用，提出通过石墨烯与某些特定的光催化材料复合而改变其禁带宽度，可为今后通过石墨烯调节其它半导体材料的禁带宽度提供有力的理论和实验依据。

关键词: 光催化, 石墨烯, 复合法, 包覆法