期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 714, 期 -, 页码 619-626出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2017.04.108
关键词
BiVO4; g-C3N4; Coral-like; Z-scheme; Toluene; Photocatalytic oxidation
资金
- State Science and Technology Support Program [2013BAC16B01]
- National Natural Science Foundation of China [5117841, 51278456]
A coral-like direct Z-scheme BiVO4/g-C3N4 photocatalyst was synthesized by a calcination method for the photocatalytic oxidation of toluene. The structures and optical properties of the photocatalysts were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FT-IR), the Brunauer-Emmett-Teller (BET) method and UV-Vis diffuse reflectance spectroscopy (DRS). BiVO4/g-C3N4 composites exhibited coral-like structures, with well-defined boundaries and high specific surface area (33.97 m(2) g(-1)) compared to a g-C3N4 sample (5.627 m(2) g(-1)). The introduction of BiVO4 to g-C3N4 greatly enhanced the photocatalytic efficiency. For the optimum BiVO4/g-C3N4 photocatalyst, the degradation rate constant and mineralization rate of toluene were 3.2 and 4.5 times greater, respectively, than those of pure g-C3N4 under visible light (lambda > 400 nm). A direct Z-scheme mechanism is proposed for the enhanced photocatalytic activity and was further confirmed by electron spin-resonance spectroscopy (ESR) and terephthalic acid photoluminescence (TA-PL) experiments. This study demonstrated a coral-like BiVO4/g-C3N4 photocatalyst for the efficient photocatalytic oxidation of toluene and provided some understanding for designing direct Z-scheme photocatalysts. (C) 2017 Elsevier B. V. All rights reserved.
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