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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

Author:
Li, Yuzhen, Wang, Xiaojin, Huo, Haohao, Li, Zhen, Shi, Jianhui
Source:
Colloids and surfaces 2020 v.587 pp. 124322
ISSN:
0927-7757
Subject:
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
Abstract:
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.
Agid:
6785782