High-Performance α-Bi₂O₃/CdS Heterojunction Photocatalyst: Innovative Design, Electrochemical Performance and DFT Calculation

Abstract:

Heterojunction semiconductor photocatalysis is an auspicious technique for clear up organic pollutants from water, and have been of valuable strategy in the area of photocatalysis. Herein, electrophoretic deposition procedure was used to prepare α-Bi₂O₃/CdS type-Ⅱ heterojunction photocatalysts. The results of PL, Raman, and EIS show that there is a heterojunction effect in α-Bi₂O₃/CdS, which is propitious to improve the separation efficiency of photogenerated electron-hole pairs. The DFT calculation reveals that the work function of CdS (4.57 eV) is higher than that of α-Bi₂O₃ (3.37 eV), which facilitates the migrating of e^- from the CB of α-Bi₂O₃ to the CB of CdS, and the migrating of h⁺ from the VB of CdS to the VB of α-Bi₂O₃, thus the e^--h⁺ pairs with high redox ability are retained. The performances were assessed by degrading methyl orange (MO), acid magenta under simulated visible light irradiation. Under simulated visible light irradiation, BC45 composite exhibited the highest degradation efficiency of 87% (MO) and 81% (acid fuchsin) for 4 h, which was about 2 times higher than that of CdS (MO) and (acid fuchsin). It is believed that the dual characteristics of H₂O wettability and dye adsorption performance in α-Bi₂O₃/CdS composites promote photocatalytic process compared with single CdS and α-Bi₂O₃. The study could provide new insights to develop efficiently capable photocatalysts of the α-Bi₂O₃/CdS composites.

• Periodical: Journal of Nano Research (Volume 71)
• Pages: 13-28
• DOI: https://doi.org/10.4028/www.scientific.net/JNanoR.71.13
• Online since: January 2022
• Authors: Shui Tuan Lin, Lian Wei Shan*, Cheng Guo Ma, Ming Qi Yuan, Zi Lan Fang, Yan Wei Xiao, Li Min Dong, Dan Li, Ying Kui Guo
• Keywords: Electrophoretic Deposition, Interface Engineering, Photocatalysis, Work Function, α-Bi₂O₃/ CdS Heterojunction

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