累托石基复合光催化材料研究进展

doi:10.11896/cldb.19030095

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Abstract Photocatalysis plays a vital role in counteracting worldwide environmental pollution and energy shortage because it can use solar energy for photocatalytic degradation of pollutants, photocatalytic hydrogen generation, carbon dioxide storage and disinfection. The key of photocatalytic technology is to design an efficient, cost-effective and recyclable photocatalysts. However, the photocatalytic efficiency of traditional photoca-talysts is limited by their poor utilization of solar energy, low quantum yield and insufficient photochemical stability. In recent years,many methods have been developed to enhance the photocatalytic activity of semiconductor photocatalysts, including morphological control, metal or non-metal doping,heterojunction design, noble metal deposition, loading and developing novel photocatalysts.
Photocatalytic processes are mainly solid-liquid reactions on the surface,thus better adsorption performance and higher surface activity are highly desirable for photocatalysts. However, the small specific surface area and poor adsorption capacity lead to the low efficiency of many photocatalysts. In addition, most photocatalysts tend to agglomerate and difficult to separate and recover, which hinder their large-scale applications.In the last decades, many efforts have been devoted to fabricating rectorite-based photocatalysts,the large specific surface area, excellent ion exchange performance and stable structure of rectorite making it possible to solve the problems of poor adsorption and separation of conventional photocatalysts, thus improve photocatalytic efficiency.Additionally, the unique layered structure of rectorite may facilitate the photocatalytic reactions.
Till now,numerous cost-effective, highly efficient and stable rectorite-based photocatalysts such as rectorite-supported TiO₂,Bi₂O₃,Bi₂WO₆,BiOI,Bi₂NbO₅F,ZnO,Ag₃PO₄,In₂O₃,CdS,Cu₂O and g-C₃N₄ have been successfully synthesized. It was found that the introduction of rectorite in the composite could effectively enhance the adsorption performance,inhibit the combination of photogenerated electrons and holes,depress photo corrosion and increase the visible light utilization of the catalysts, which promoted the practical applications of rectorite-based photocatalysts in environmental field.
This article systematically reviews the research progress of rectorite-based composites in photocatalytic field, the preparation process of the rectorite-based photocatalysts has been summarized, and special emphasis is given to the mechanism of rectorite for the enhanced photocatalytic performance. Moreover, the influences of preparation and reaction conditions on the catalytic activities of the rectorite-based photocatalysts are elaborated. Finally, the development prospects of rectorite-based photocatalytic composites are given, which may provide insights into the applications of rectorite-based materials in photocatalytic field.

Key words： photocatalysis rectorite-based photocatalysts degradation mechanism clay mineral ion exchange organic contaminants

Published: 13 May 2020

CLC number:

TB33

Fund:This work was financially supported by the National Natural Science Foundation of China (51604194, 51374157),Postgraduate Education Innovation Foundation of Wuhan Institute of Technology (CX2018145) and China Scholarship Council (201808420137).

About author:: Wei Yang, received his B.E. degree in environmental engineering from North China University of Technology in 2017. He is currently pursuing his master's degree in the School of Chemistry and Environmental Enginee-ring,Wuhan Institute of Technology under the supervision of Prof. Jinyi Chen and A/Prof. Sheng Guo. His research has focused on the modification of clay mineral materials and their applications for water pollution control.
Sheng Guo, received his Ph.D. degree in environmental engineering from Wuhan University of Technology in 2015. He is currently an anassociate professor in Wuhan Institute of Technology. Since December 2018, he pursued postdoctoral research work in Nanyang Environment & Water Research Institute, Nanyang Technological University, Singapore. His research interests are green and novel environ mentalmaterials,advanced oxidation processes (AOPs) such as photocatalysis and Fenton/PMS activation, and 3D printing technologies for environmental applications.
Jinyi Chen, dean and professor of School of Chemistry and Environmental Engineering,Wuhan Institute of Technology, supported by Program for New Century Excellent Talents in University, the Third Level Personnel of High-level Talent Engineering in Hubei Province in the New Century and the director of the Engineering Research Center of Chemical Environmental Pollution Control in Hubei Province. He received his Ph.D. degree from School of Resources and Environmental Sciences, Wuhan University in 2007. His research interests include water pollution control, new-type environmental functional materials and ecological environment planning.

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Cite this article:

YANG Wei,GUO Sheng,CHEN Jinyi. Research Progress on Rectorite-based Photocatalysts[J]. Materials Reports, 2020, 34(11): 11022-11028.

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http://www.mater-rep.com/EN/10.11896/cldb.19030095 OR http://www.mater-rep.com/EN/Y2020/V34/I11/11022

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