A novel step-scheme BiVO4/Ag3VO4 photocatalyst for enhanced photocatalytic degradation activity under visible light irradiation

doi:10.1016/S1872-2067(20)63560-4

Abstract

Abstract:

Over the past few years, the emission of organic pollutants into the environment has increased tremendously. Therefore, various photocatalysts have been developed for the degradation of organic pollutants. In this study, a step-scheme BiVO₄/Ag₃VO₄ composite was synthesized via a hydrothermal and chemical deposition process for the degradation of methylene blue.The composite showed strong redox ability under visible light. The 40%BiVO₄/Ag₃VO₄ composite showed excellent photocatalytic degradation properties with a K_app of 0.05588 min^-1, which is 22.76 and 1.76 times higher than those of BiVO₄ (0.00247 min^-1) and Ag₃VO₄ (0.03167 min^-1), respectively. The composite showed a stable performance and could retain 90% of its photocatalytic activity even after four cycles. The improved catalytic performance of the composite as compared to BiVO₄ and Ag₃VO₄ can be attributed to its novel step-scheme mechanism, which facilitated the separation of the photogenerated charges and increased their lifetime. The photoluminescence measurement results and transient photocurrent response revealed that the composite showed efficient extraction of charge carriers.

Key words: Step-scheme photocatalyst, BiVO4, Ag3VO4, Photocatalytic activity, Methylene blue

Lizhong Liu, Taiping Hu, Kai Dai, Jinfeng Zhang, Changhao Liang. A novel step-scheme BiVO₄/Ag₃VO₄ photocatalyst for enhanced photocatalytic degradation activity under visible light irradiation[J]. Chinese Journal of Catalysis, 2021, 42(1): 46-55.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(20)63560-4

https://www.cjcatal.com/EN/Y2021/V42/I1/46

Figures/Tables 14

Fig. 1. Schematic of the synthesis of the X%BiVO4/Ag3VO4 composites.

Fig. 2. XRD patterns of BiVO4, Ag3VO4, and the X%BiVO4/Ag3VO4 composites.

Fig. 3. SEM images of (a) BiVO4, (b) Ag3VO4, and (c) 40%BiVO4/Ag3VO4; (d) EDS spectra of 40%BiVO4/Ag3VO4 and (e-i) elemental mapping of 40%BiVO4/Ag3VO4.

Fig. 4. (a, b) TEM images and (c, d) HRTEM images of 40%BiVO4/Ag3VO4.

Fig. 5. XPS survey spectra of (a) BiVO4, 40%BiVO4/Ag3VO4, and Ag3VO4 and their high-resolution (b) Bi 4f, (c) Ag 3d, (d) V 2p, and (e) O 1s spectra.

Fig. 6. (a) N2 adsorption-desorption isotherms and (b) SBET values of the BiVO4, Ag3VO4, and X%BiVO4/Ag3VO4 catalysts.

Fig. 7. (a) UV-Vis DRS spectra of Ag3VO4, X%BiVO4/Ag3VO4, and BiVO4; (b) Eg values for Ag3VO4 and BiVO4.

Fig. 8. PL spectra of the BiVO4, Ag3VO4, and X%BiVO4/Ag3VO4 catalysts.

Fig. 9. (a) Transient photocurrent responses and (b) EIS results of Ag3VO4, BiVO4, and X%BiVO4/Ag3VO4.

Fig. 10. (a) Photocatalytic degradation of MB; (b) Linear transform ln(C0/C) of the kinetic curves for MB degradation using the catalysts; (c) The apparent pseudo-first-order rate constants (kapp) of the catalysts.

Table 1 Degradation rates and Kapp values of the catalysts (degradation time: 50 min).

Sample	Degradation rate (%)	K_app(min^-1)
Ag₃VO₄	83.77	0.03167
BiVO₄	16.31	0.00247
20%BiVO₄/Ag₃VO₄	84.89	0.03377
40%BiVO₄/Ag₃VO₄	93.48	0.05588
60%BiVO₄/Ag₃VO₄	84.46	0.03012
BiVO₄+Ag₃VO₄	87.00	0.03511

Fig. 11. (a) MB degradation activities of the photocatalysts after four cycles; (b) XRD patterns of the fresh and used 40%BiVO4/Ag3VO4 catalysts.

Fig. 12. MB degradation rate of 40%BiVO4/Ag3VO4 in the presence of different capture agents.

Fig. 13. Step-scheme charge carrier flow for the composite.

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A novel step-scheme BiVO₄/Ag₃VO₄ photocatalyst for enhanced photocatalytic degradation activity under visible light irradiation

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