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A novel binary visible-light-driven photocatalyst type-I CdIn2S4/g-C3N4 heterojunctions coupling with H2O2: Synthesis, characterization, photocatalytic activity for Reactive Blue 19 degradation and mechanism analysis

Li, Yuzhen, Wang, Xiaojin, Huo, Haohao, Li, Zhen, Shi, Jianhui
Colloids and surfaces 2020 v.587 pp. 124322
Fourier transform infrared spectroscopy, X-ray diffraction, absorption, carbon nitride, chemical structure, dyes, hydrogen peroxide, irradiation, light, optical properties, photocatalysis, photocatalysts, photolysis, scanning electron microscopy, sulfides, transmission electron microscopy
A visible-light-driven photocatalyst CdIn₂S₄/g-C₃N₄ was firstly synthesized via a facile and green wet-impregnation method. The crystal phases, particle morphologies, chemical structures and optical properties of the prepared pure g-C₃N₄, bare CdIn₂S₄ and binary CdIn₂S₄/g-C₃N₄ heterojunctions were measured in detail by various standard characterization techniques, such as XRD, SEM, TEM, FT-IR, DRS, and PL. And then, a novel and high-efficiency visible-light-driven photocatalytic system comprised of binary CdIn₂S₄/g-C₃N₄ heterojunctions and H₂O₂ has been successfully constructed and exhibited superior photocatalytic degradation of Reactive Blue 19 (RB19). The following results can be obtained by photochemical characterizations and photocatalysis experiments: Compared with the pristine g-C₃N₄, the addition of CdIn₂S₄ to form a type-I CdIn₂S₄/g-C₃N₄ heterojunction effectively increases the visible light absorption range and reduces the recombination rate of photogenerated electron-hole pairs. After 100 min visible light irradiation, the photocatalytic degradation rate of RB19 by CdIn₂S₄/g-C₃N₄ was approximately 8.30 times and 2.68 times higher than that of monomer g-C₃N₄ and CdIn₂S₄, respectively. After 60 min visible light irradiation, the photodegradation efficiency of the novel photocatalytic system (CdIn₂S₄/g-C₃N₄ and H₂O₂) is 1.99 times higher than that of CdIn₂S₄/g-C₃N₄ for RB19. Furthermore, the photocatalytic mechanism of the novel visible-light-driven photocatalytic system was proposed and elaborated. These findings emphasize the main role of g-C₃N₄ in the degradation of organic dyes and provide a reasonable and effective method for rational design of a high-efficiency and low-cost visible light-driven photocatalytic system.