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A novel and efficient ternary composite AgCl/Bi 12 O 15 Cl 6 /g-C 3 N 4 photocatalyst was prepared by co-precipitation method. The physical structure and photochemical properties of the photocatalyst were analyzed by X-ray diffraction (XRD), Scanning electron microscopy (SEM), Transmission electron microscopy (TEM), Ultraviolet diffuse reflectance spectroscopy (UV-DRS), Fluorescence spectroscopy (PL). The performance of the prepared photocatalysts was evaluated by performing degradation experiments of tetracycline (TC) under different conditions (doping ratio, dosage, initial concentration and initial pH of solution). Furthermore, the stability of composite was confirmed by cycling experiment. Finally, the mechanism of ternary composite AgCl/Bi 12 O 15 Cl 6 /g-C 3 N 4 photocatalyst for decomposition of TC in visible light was investigated by free radical capture experiment. The photoluminescence spectra showed that the peak intensity of the AgCl/Bi 12 O 15 Cl 6 /g-C 3 N 4 composite was significantly reduced compared to other materials, indicating that the photogenerated electron-hole pairs were effectively separated, which contributed to its photocatalytic activity. The composite showed higher TC degradation activity compared to g-C 3 N 4 , Bi 12 O 15 C l6 /g-C 3 N 4 and AgCl/g-C 3 N 4 , with optimum degradation rate constants of 8.2, 2.2 and 1.6 times that of g-C 3 N 4 , Bi 12 O 15 C l6 /g-C 3 N 4 and AgCl/g-C 3 N 4 , respectively. Furthermore, based on the free radical capture experiment, it was confirmed that the active species playing a major role in the reaction process were·O 2 -, followed by h+ and·OH. A double electron transfer mechanism was inferred to be formed in the AgCl/Bi 12 O 15 Cl 6 /g-C 3 N 4 composite and a possible pathway for the degradation of TC was postulated. This work provides a new approach for the effective use of solar energy, as well as a new solution strategy for the degradation of TC in wastewater. [Display omitted] The proposed photocatalytic mechanism for photocatalytic degradation of TC on AgCl/ Bi 12 O 15 Cl 6 /g-C 3 N 4. • The AgCl/Bi 12 O 15 Cl 6 /g-C 3 N 4 exhibited excellent photodegradation of tetracycline (TC) compared to the monomer. • A possible electron transfer mechanism was proposed. • The two-electron transfer mechanism promoted the separation of photogenerated electron-hole pairs in complexes. • Superoxide radical (·O 2 -) was the main reactants in photodegradation, followed by h+ and·OH. [ABSTRACT FROM AUTHOR]

The construction of new electron transfer channels is essential to improve the photocatalyst activity. Herein, a novel Ag 2 MoO 4 /SrWO 4 /g-C 3 N 4 photocatalyst with dual electron transfer channels was constructed by one-step precipitation method. The obtained photocatalysts were characterized using XRD, SEM, FT-IR, TEM, Uv-vis and PL. Under visible light, the photocatalyst was evaluated for its ability to degrade tetracycline (TC). The characterization results presented that the olive sphere-like SrWO 4 and the nanosphere-like Ag 2 MoO 4 were uniformly dispersed on the surface and pores of g-C 3 N 4 , forming a heterostructure and thereby heterojunctions, which promoted the internal electron transfer. The degradation experiments showed that the Ag 2 MoO 4 /SrWO 4 /g-C 3 N 4 improved degradation efficiency of TC under visible light relative to monomeric and binary materials. In addition, the 20AMO/8SW/CN maintained 92.19 % degradation of TC after four cycles of experiments, showing excellent reusability. During the photocatalytic process, ·O 2 -, h+, and ·OH promoted the degradation of TC. Combining with the energy band structure analysis, it was found that a novel dual electron transfer channel had been constructed among Ag 2 MoO 4 , SrWO 4 and g-C 3 N 4 , which markedly enhanced photocatalytic efficiency. The work provides a potential approach for developing efficient and stable photocatalysts. [Display omitted] • A novel visible light responsive Ag 2 MoO 4 /SrWO 4 /g-C 3 N 4 photocatalysts were fabricated by one-step precipitation method. • The introduction of SrWO 4 and Ag 2 MoO 4 optimized the separation rate of photogenerated electron hole pairs in g-C 3 N 4. • Ag 2 MoO 4 /SrWO 4 /g-C 3 N 4 presented excellent photocatalysis and photochemical stability towards degradation of tetracycline. • An efficient dual electron transfer channels was proposed based on Ag 2 MoO 4 /SrWO 4 /g-C 3 N 4 photocatalysts. [ABSTRACT FROM AUTHOR]