Applications of Graphene Oxide/Metal-Organic Framework Composites in Photocatalysis
ZHU Jiale1,2, BAI Yuting1, FENG Sisi1
1 Institute of Molecular Science, Shanxi University, Taiyuan 030006, China 2 School of Chemistry and Chemical Engineering, Shanxi University, Taiyuan 030006,China
Abstract: Photocatalysis is considered as an effective method to solve currently environmental problems and energy crises around the world due to its advantages of safe, environment-friendly, and inexpensive. Research and development of photocatalytic materials are critical for photocatalysis, and it is the common pursuit of many researchers to prepare photocatalytic catalysts with high photocatalytic activity, stable composition, and excellent recyclability. In recent years, metal-organic frameworks (MOFs), as a new kind of photocatalytic materials, have been widely concerned. However, due to their disadvantages such as the unstable structure, the tendency to cluster, and the easy combination of photogenerated electron-hole pairs, their photocatalytic performances have been seriously affected, which limits the applications of MOFs in actual production and life. Therefore, it is of great significance to find a simple and practical method to improve the photocatalytic performance of MOFs. It has been verified that the combination of graphene oxide (GO) and MOFs is one of the effective methods. The abundant oxygenic functional groups on the surface of GO can facilitate the hybridization of GO with MOFs. The stable two-dimensional planar structure of GO can enhance the structural stability of MOFs. Meanwhile, the extremely strong hydrophilic ability of GO can also make MOFs easy to disperse in the solvent. In addition, it is worth mentioning that the recombination rate of the photogenerated electron-hole pairs of GO/MOF composites is efficiently reduced, and their photocatalytic performance can be significantly improved compared with that of the parent component. Moreover, the technique is easy to operate and low in cost, and it has good applicability to a variety of MOFs. In this paper, the recent progress of GO/MOF composites is reviewed, and the application of the composites as photocatalysts in the removal of environmental pollutants is highlighted, including removal of gaseous pollutants, reduction of heavy metal ions, degradation of antibiotic drugs, degradation of organic dyes and other organic pollutants. Finally, future perspectives on the development and application of GO/MOF composites for pollution remediation are presented.
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