关键词: 光催化, 石墨烯, 复合法, 包覆法

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