Construction of Cu-Fe Bimetallic Oxide/Biochar/Ag3po4 Heterojunction for Improving Photo-Corrosion Resistance and Photocatalytic Performance Achieves Efficient Removal of Phenol
Ag3PO4 has an excellent visible light response, but its serious photo-corrosion has limited its application in environmental remediation. Here, we constructed a magnetic heterojunction photocatalyst (CuFe2O4 /Biochar/Ag3PO4 ) to inhibit its photo-corrosion and enhance photocatalytic activity. Notably, the composite catalyst (0.5 g/L) was used to thoroughly degrade phenol (20 mg/L) at 18 min, and its apparent kinetic constant is fivefold that of pure Ag3PO4 . The analysis of XPS, XRD, and cyclic degradation experiments confirmed that the photo-corrosion of the heterojunction photocatalyst was significantly suppressed. The enhanced photo-corrosion resistance of Ag3PO4 can be ascribed to the rapid transfer and consumption of photoelectrons on the Ag3PO4 surface by biochar and CuFe2O4 , thereby avoiding photo-corrosion. Especially, Ag3PO4 as a hole-rich region can protect Ag + from being reduced. DFT calculations further revealed the electron transfer and anti-photocorrosion mechanism of Ag3PO4 . The photogenerated •O2- and h+ played a major role in phenol degradation. A possible degradation pathway was proposed by DFT calculations and GC-MS analysis. This study provides a novel ternary heterojunction photocatalyst to improve the catalytic performance and photo-corrosion resistance of Ag3PO4
Year of publication: |
[2022]
|
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Authors: | Liu, Xianjie ; zhou, jiabin ; Wang, Geming ; Liu, Dan ; Liu, Su |
Publisher: |
[S.l.] : SSRN |
Saved in:
freely available
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