Abstract
Energy crisis and environmental pollution are the major problems of human survival and development. Photocatalytic technology can effectively use solar energy and is prospective to solve the above-mentioned problems. Carbon nitride is a two-dimensional polymer material with a graphite-like structure. It has good physical and chemical stabilities, unique chemical and electronic energy band structures, and is widely used in the field of photocatalysis. Graphitic carbon nitride has a conjugated large π bond structure, which is easier to be modified with other compounds. thereby the surface area and visible light absorption range of carbon nitride-based photocatalytic composites can be insignificantly increased, and interface electron transmission and corresponding photogenerated carriers separation of streams are simultaneously promoted. Therefore, the present study systematically introduced the basic catalytic principles, preparation and modification methods, characterization and calculation simulation of carbon nitride-based photocatalytic composite materials, and their application in wastewater treatment. We also summarized their application in wastewater treatment with the aid of artificial intelligence tools. This review summarized the frontier technology and future development prospects of graphite phase carbon nitride photocatalytic composites, which provide a theoretical reference for wastewater purification.
Highlights
With the development of industry and society, water pollution is becoming increasingly serious, which is a worldwide problem of environmental governance [1,2,3]
The results show that the modified composite has excellent photocatalytic activity, mainly because the coupling effect between N-doped carbon quantum dots (NCD) upconversion effect and defect rich g-C3N4 (DCN) defect effect enhances the visible light response and inhibits the charge recombination
The results show that the C3N/g-C3N4 heterojunction is expected to be a direct Z-scheme photocatalyst, which is due to the band bending caused by charge transfer between C3N and g-C3N4
Summary
With the development of industry and society, water pollution is becoming increasingly serious, which is a worldwide problem of environmental governance [1,2,3]. CVD mainly refers to the synthesis of coatings or nanomaterials by one or several gaseous compounds or monomers on the surface of the substrate, which can be used to prepare high-quality g-C3N4 [64,65,66] At present, the main methods are electron cyclotron resonance, hot wire assisted, DC glow discharge, RF discharge, and indirect microwave plasma chemical vapor deposition. Hu et al [68] prepared g-C3N4 powder by a new microwave-assisted solvothermal synthesis method at a certain time and temperature, which had a good photocatalytic effect on the degradation of organic dyes under visible light irradiation
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