Journal
SEPARATION AND PURIFICATION TECHNOLOGY
Volume 232, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.seppur.2019.115959
Keywords
Photocatalysis; MIL-53(Fe)/alpha-Bi2O3/g-C3N4; Visible light; Direct solid-state dual Z-scheme; Amido black 10B
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Funding
- National Natural Science Foundation of China [51508254]
- Fundamental Research Funds for the Central Universities [lzujbky-2017-it98]
- College students' innovative practice training program of Chinese Academy of Sciences [Y710171040]
- Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences
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Z-scheme heterojunction photocatalyst can simultaneously reduce the recombination of photo-generated electron-hole pairs and preserve its outstanding redox ability during the process of photocatalytic reaction. In this study, Z-scheme MIL-53(Fe)/alpha-Bi2O3/g-C3N4 photocatalyst was successfully fabricated via an accessible method and comprehensive characterized by XRD, FT-IR, SEM, TEM, XPS, N-2 adsorption-desorption isotherms, UV-vis diffuse reflection spectroscopy and photoelectrochemical analysis. The as-obtained MIL-53(Fe)/alpha-Bi2O3/g-C3N4 composite exhibited superior photocatalytic activity for amino black 10B degradation than that of pure g-C3N4, alpha-Bi2O3, MIL-53(Fe) and alpha-Bi2O3/g-C3N4 binary composite under visible light irradiation and the photo degradation rate would achieve the maximum when the mass fraction of MIL-53(Fe) was 32% in ternary composite. The enhanced photocatalytic performance of MIL-53(Fe)/alpha-Bi2O3/g-C3N4 ternary composite could be mainly ascribed to improved visible light absorption range and the construction of an effective interfacial heterojunction driven by direct solid-state dual Z-scheme mechanism, which significantly facilitates the separation and transfer of photo-generated charge carriers. Eventually, the as-prepared ternary composite was confirmed to have prominent stability and reusability after consecutive 4 recycling run.
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