Ag3PO4/Bi2WO6 Heterojunction Photocatalyst with Remarkable Visible-Light-Driven Catalytic Activity

Novel Ag3PO4/Bi2WO6 catalysts with enhanced visible-light performance were synthesized using a hydrothermal method and characterized to investigate their morphology, microscopic structure, and binding energies. Photoluminescence spectrum (PL) and electrochemical impedance spectroscopy (EIS) data dem...

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Bibliographic Details
Published in:Crystals (Basel) 2023-11, Vol.13 (11), p.1531
Main Authors: Wang, Li, Wang, Junbo, Fei, Yanfei, Cheng, Heping, Pan, Hua, Wu, Chunfeng
Format: Article
Language:English
Subjects:
Ag3PO4
Bi2WO6
Bismuth compounds
Catalysts
Catalytic activity
Electrochemical impedance spectroscopy
Electrodes
Electron transfer
Electronic structure
Electrons
Energy gap
heterojunction
Heterojunctions
Light
Malachite green
Methylene blue
Molecular orbitals
Phosphates
Photocatalysis
photocatalyst
Photoluminescence
Pollutants
Rhodamine
Silver compounds
Spectrum analysis
Tungstates
visible-light-driven
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Summary:Novel Ag3PO4/Bi2WO6 catalysts with enhanced visible-light performance were synthesized using a hydrothermal method and characterized to investigate their morphology, microscopic structure, and binding energies. Photoluminescence spectrum (PL) and electrochemical impedance spectroscopy (EIS) data demonstrate that the formed Ag3PO4/Bi2WO6 heterojunction effectively promotes hole (h+)–electron (e−) separation and transfer efficiency, resulting in the enhancement of photocatalytic activity. Ag3PO4/Bi2WO6 displays higher photocatalytic activity than pure Bi2WO6 or Ag3PO4 alone. Photogenerated holes (h+), ·O2−, and ·OH were found to be the main active species for the degradation of malachite green (MG), methylene blue (MB), and Rhodamine B (RhB). The DFT calculation explains the photostability of Ag3PO4/Bi2WO6 from the perspective of electronic structure. The bandgap of Ag3PO4/Bi2WO6 between the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO) is 1.41 eV, compared with that of Ag3PO4 at 0.91 eV and Bi2WO6 at 2.59 eV. Ag–O–Bi hybridization and the wide HOMO–LUMO bandgap lead to difficulty in electron transfer. As a consequence, Ag+ is difficult to obtain electrons and difficult to convert into Ag0, which makes the catalyst stable.
ISSN:2073-4352
2073-4352
DOI:10.3390/cryst13111531