基于催化活性提升的g-C<sub>3</sub>N<sub>4</sub>的表面活化、敏化及功能化研究进展

doi:10.11896/cldb.19040154

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Abstract Graphite-type carbon nitride (g-C₃N₄) is an electron-rich organic semiconductor with a band gap of 2.7 eV between the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO). Thus, it has better photocatalytic performance. Compared with the traditional photocatalyst, g-C₃N₄ contains no metal elements and has a narrow band gap. Because of its good chemical stability, easy structure regulation and simple preparation, g-C₃N₄ has become a hot spot in the development of photocatalyst. However, the original g-C₃N₄ formed by heat-shrinking polymerization of a nitrogen-rich organic precursor still has a large number of structural defects due to incomplete polymerization. In photocatalytic reactions, these structural defects often act as recombination centers for electron-hole pairs, greatly reducing charge separation efficiency and thus reducing photocatalytic activity. In addition, the conductivity of g-C₃N₄ is weak, which leads to the huge energy consumed by the photogenerated electrons in the bulk phase to migrate to the surface layer, which in turn causes the reduction potential of photogenerated electrons to decrease. Therefore, the catalytic effect of g-C₃N₄ is also reduced. Moreover, the bulk g-C₃N₄ has disadvantages such as small specific surface area and poor liquid phase dispersion. In summary, the stability and catalytic activity of g-C₃N₄ catalysts are poor, which greatly limits the development of related fields. In recent years, the development of high stability, high catalytic activity of g-C₃N₄ catalyst has become the focus of photocatalyst.
In recent years, researchers have adopted methods such as templating, elemental doping, copolymerization, precious metal deposition or semiconductor recombination to enhance their photocatalytic activity, so that g-C₃N₄ can be applied to fields such as photolysis water hydrogen evolution, organic pollutant degradation, artificial photosynthesis, antibacterial and selective conversion of organic functional groups. However, the above modification methods are mainly based on the electronic properties of g-C₃N₄ to regulate its matrix. Usually, the catalytic reaction is mainly carried out on the surface of the photocatalyst, so surface modification of g-C₃N₄ is a more economical and effective method for improving its photocatalytic activity.
In this paper, the research progress of surface modification of g-C₃N₄ is reviewed. This review firstly analyzes the surface functional group state of g-C₃N₄, and then reviews the research status of g-C₃N₄ surface modification from three aspects of activation, sensitization and surface functionalization, and finally prospects the direction of development.

Key words： polymeric graphitic carbon nitride activation sensization surface functionalization

Published: 13 May 2020

CLC number:	O6
	TB3

Fund:This work was financially supported by National Natural Science Foundation of China (61705101), Jiangsu Province Science and Technology Support Program (BE2014039), Postgraduate Research and Practice Innovation Program of Jiangsu Province (SJCX19_0590), Opening Project of Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology (ASMA201809), School-level Research Foundation of Nanjing Institute of Technology (QKJ201801) and the Innovative Foundation Project for Students of Nanjing Institute of Technology (TB201916011).

About author:: Huili Yu,graduated from Nanjing Institute of Technology in June 2018 with a bachelor's degree in engineering. She is currently a graduate student in the School of Mechanical Engineering, Nanjing Institute of Technology, and conducts research under the guidance of Professor Zusheng Hang. Currently the main research area is me-lamine composites.
Zusheng Hang, a professor and a tutor for master students. He is mainly engaged in the research of melamine-based new materials and high-performance plastic modification. He is currently the director of the Department of Polymer and Composite Materials Engineering, a member of the Technical Committee of the China Nitrogen Fertilizer Association, a director of Jiangsu Provincial Particle Society and Jiangsu Composite Materials Society, a judge of Jiangsu high-tech enterprises, and a young academic backbone. Presided over the completion of 1 each of Jiangsu Natural Science Youth Fund, Yixing Major Industry-University-Research Cooperation Project, and Jiangsu Province Key Laboratory Fund; participated in 6 national and provincial projects including the National Natural Science Foundation of China, Jiangsu Province Key R & D Program; Industry-University-Research Cooperation. He has rich experience, leading 8 horizontal projects in the past 3 years, adding more than 10 million new output value to the companies he serves, publishing more than 50 scientific papers, including 15 SCI/EI papers, and authorizing and applying for more than 60 patents.

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Cite this article:

YU Huili,HANG Zusheng,HUAI Xu, et al. A Review of Surface Activation,Sensization and Functionalization of g-C₃N₄ Based on Promoting Catalytic Performance[J]. Materials Reports, 2020, 34(11): 11121-11128.

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http://www.mater-rep.com/EN/10.11896/cldb.19040154 OR http://www.mater-rep.com/EN/Y2020/V34/I11/11121

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