Photocatalytic Degradation and Reduction Properties of AuAg/Bi2O3 Composite

doi:10.11901/1005.3093.2020.182

Chinese Journal of Materials Research

2020, Vol. 34

Issue (12): 921-932 DOI: 10.11901/1005.3093.2020.182

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Photocatalytic Degradation and Reduction Properties of AuAg/Bi₂O₃ Composite

SUN Xiaofeng, XIAN Tao(

), DI Lijing, ZHOU Yongjie, LI Hongqin

College of Physics and Electronic Information Engineering, Qinghai Normal University, Xining 810008, China

Cite this article:

SUN Xiaofeng, XIAN Tao, DI Lijing, ZHOU Yongjie, LI Hongqin. Photocatalytic Degradation and Reduction Properties of AuAg/Bi₂O₃ Composite. Chinese Journal of Materials Research, 2020, 34(12): 921-932.

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Abstract

Bi₂O₃ particles were fabricated by polyacrylamide gel method, after that the as-prepared Bi₂O₃ particles were decorated by the AuAg alloy nanoparticles (6~18 nm) to obtain AuAg/Bi₂O₃ composite. The composite exhibits obvious light absorbance centered around ~577 nm owing to the surface plasmon resonance (SPR) effect of AuAg alloy, which extends the light response range of Bi₂O₃. More importantly, the separation of photogenerated charges in bare Bi₂O₃ can be improved by the decoration of AuAg alloy nanoparticles. The rhodamine B (RhB), methyl orange (MO) and Cr(VI) are employed as target reactant to evaluate the photocatalytic degradation and reduction activity of AuAg/Bi₂O₃ composite under simulated sunlight and visible light irradiation. Results indicate that the composite exhibits obviously enhanced photocatalytic activity compared with the bare Bi₂O₃. After simulated sunlight irradiation for 2 h the degradation percentage of RhB and MO as well as reduction percentage of Cr(VI) increase by ~34.2%, ~38.0% and ~56.7%, respectively. Furthermore, it is worth noting that the AuAg/Bi₂O₃ composite has excellent photocatalytic and structure stability. According to above experimental results a possible photocatalytic mechanism of AuAg/Bi₂O₃ composite was proposed.

Key words: composite AuAg alloy Bi₂O₃ photocatalysis modification

Received: 22 May 2020

ZTFLH:

TB383

Fund: National Natural Science Foundation of China(51602170);Natural Science Foundation of Qinghai(2020-ZJ-936Q);Youth Science Foundation of Qinghai Normal University(2019zr003)

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	Xiaofeng SUN
	Tao XIAN
	Lijing DI
	Yongjie ZHOU
	Hongqin LI

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https://www.cjmr.org/EN/10.11901/1005.3093.2020.182 OR https://www.cjmr.org/EN/Y2020/V34/I12/921

Fig.1 Schematic illustration of the preparation process of the Bi₂O₃

Fig.2 Schematic illustration of the decoration of AuAg alloy on the Bi₂O₃

Fig.3 XRD patterns (a) and enlarged XRD patterns (b) of Bi₂O₃and AuAg/Bi₂O₃ composite

Fig.4 Morphology and microstructure images of Bi₂O₃and AuAg/Bi₂O₃ composite (a) TEM and (b) SEM image of Bi₂O₃, (c) HRTEM image of Bi₂O₃, (d) and (e) TEM image of AuAg/Bi₂O₃, (f) HRTEM image of AuAg/Bi₂O₃

Fig.5 EDX spectrum (a) and elemental mapping images of AuAg/Bi₂O₃ composite (b) Bi, (c) O, (d) Au, (e) Ag

Fig.6 High-resolution X-ray photoelectron spectroscopy of elements in AuAg/Bi₂O₃ composite (a) Bi4f, (b) O1s, (c) Au4f, (d) Ag3d

Fig.7 UV-vis diffuse reflectance spectra of Bi₂O₃ and AuAg/Bi₂O₃ composite (a), their corresponding first derivative (b) of the diffuse reflectance spectra

Fig.8 Photocurrent response plots (a), electrochemical impedance spectra (b) and photoluminescence spectra (c) of Bi₂O₃ and AuAg/Bi₂O₃ composite

Fig.9 photocatalytic degradation of MO and RhB over Bi₂O₃and AuAg/Bi₂O₃ under simulated sunlight and visible light irradiation, respectively (a, b), UV-vis absorption spectra of MO and RhB degraded by AuAg/Bi₂O₃(c, d) under simulated sunlight irradiation

Fig.10 Photocatalytic reduction of Cr(VI) over Bi₂O₃and AuAg/Bi₂O₃ under simulated sunlight and visible light irradiation(a), Absorption spectra of Cr(VI) reduced by AuAg/Bi₂O₃ (b) under simulated sunlight irradiation

Fig.11 photocatalytic degradation of MO and RhB (a, b), photocatalytic reduction of Cr(VI) over Ag/Bi₂O₃, Au/Bi₂O₃ and AuAg/Bi₂O₃(c) under simulated sunlight and visible light irradiation

Fig.12 Recyclability of AuAg/Bi₂O₃composite for photocatalytic degradation of MO and RhB, photocatalytic reduction of Cr(VI) (a), XRD patterns (b), and TEM images of AuAg/Bi₂O₃composite before and after the cycling runs of RhB degradation (c, d)

Fig.13 Mott-Schottky plot of the Bi₂O₃ (a) and possi-ble photocatalytic mechanism of AuAg/Bi₂O₃ composite (b)

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