Enhanced photocatalytic and photo-Fenton catalytic activity of BiFeO3 polyhedron decorated by AuAg alloy nanoparticles

AuAg/BiFeO 3 composite was successfully fabricated through a hydrothermal method followed by a photodeposition process. It is found that the AuAg alloy nanoparticles with the diameter of 7–23 nm were uniformly decorated on the polyhedral BiFeO 3 particles, and AuAg/BiFeO 3 composite exhibits stronge...

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Veröffentlicht in:Journal of materials science. Materials in electronics 2021, Vol.32 (1), p.623-639
Hauptverfasser: Sun, Xiaofeng, Di, Lijing, Xian, Tao, Zhou, Yongjie, Li, Hongqin, Gao, Yushu, Yang, Hua
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Sprache:eng
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Zusammenfassung:AuAg/BiFeO 3 composite was successfully fabricated through a hydrothermal method followed by a photodeposition process. It is found that the AuAg alloy nanoparticles with the diameter of 7–23 nm were uniformly decorated on the polyhedral BiFeO 3 particles, and AuAg/BiFeO 3 composite exhibits stronger light absorption in the visible light region than bare BiFeO 3 owing to the SPR effect of AuAg alloy nanoparticles. Acid orange 7 (AO7), phenol and Cr(VI) were employed as target pollutants to estimate the photocatalytic degradation and reduction properties of AuAg/BiFeO 3 under visible light and simulated sunlight illumination. The results reveal that the photocatalytic property of BiFeO 3 in the decomposition of organics (AO7 and phenol) and reduction of Cr(VI) can be remarkably improved after the decoration of AuAg alloy nanoparticles. Furthermore, the photo-Fenton catalytic activity of AuAg/BiFeO 3 composite toward the decomposition of phenol was also estimated under illumination of simulated sunlight, which suggests that the composite exhibits obvious enhanced photo-Fenton catalytic degradation activity in comparison to pure BiFeO 3 . On the other hand, AuAg/BiFeO 3 composite has favorable photocatalytic and photo-Fenton catalytic recyclability. The photoluminescence and photoelectrochemical measurements demonstrate that AuAg/BiFeO 3 composite reveals enhanced separation and migration of photogenerated electrons and holes. The possible catalytic mechanism for AuAg/BiFeO 3 composite was proposed according to above experiments.
ISSN:0957-4522
1573-482X
DOI:10.1007/s10854-020-04844-z