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- Title
Construction of Ag 3 PO 4 /g-C 3 N 4 Z-Scheme Heterojunction Composites with Visible Light Response for Enhanced Photocatalytic Degradation.
- Authors
Pan, Xiangping; Meng, Ying; Liu, Qingwang; Xu, Mai
- Abstract
Ag3PO4/g-C3N4 photocatalytic composites were synthesized via calcination and hydrothermal synthesis for the degradation of rhodamine B (RhB) in wastewater, and characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and diffuse reflectance spectroscopy (DRS). The degradation of RhB by Ag3PO4/g-C3N4 composites was investigated to evaluate their photocatalytic performance and cyclic degradation stability. The experimental results showed that the composites demonstrated notable photocatalytic activity and stability during degradation. Their high degradation efficiency is attributed to the Z-scheme transfer mechanism, in which the electrons in the Ag3PO4 conduction band and the holes in the g-C3N4 valence band are annihilated by heterojunction recombination, which greatly limits the recombination of photogenerated electrons and holes in the catalyst and enhances the activity of the composite photocatalyst. In addition, measurements of photocurrent (PC) and electrochemical impedance spectroscopy (EIS) confirmed that the efficient charge separation of photo-generated charges stemmed from strong interactions at the close contact interface. Finally, the mechanism for catalytic enhancement in the composite photocatalysts was proposed based on hole and radical trapping experiments, electron paramagnetic resonance (EPR) analysis, and work function evaluation.
- Subjects
ELECTRON paramagnetic resonance; X-ray photoelectron spectroscopy; CONDUCTION bands; PHOTODEGRADATION; TRANSMISSION electron microscopy; HETEROJUNCTIONS
- Publication
Molecules, 2024, Vol 29, Issue 16, p3774
- ISSN
1420-3049
- Publication type
Article
- DOI
10.3390/molecules29163774