Mechanism Study of Tetracycline High Efficient Photodegradation by Bi2WO6 Nanosheets under Visible Light Irradiation

doi:10.15541/jim20190389

Abstract

Abstract:

As a narrow band gap semiconductor, Bi₂WO₆ has great application potential in photo-degradation of organic pollutants, such as tetracycline. In present work, Bi₂WO₆ nanosheets were successfully synthesized by a hydrothermal method and the photo-degradation of tetracycline under visible light irradiation were investigated. XRD, FESEM, TEM and absorption spectra were used to characterize the structure and morphology of the material. It was found that when adding 50 mg Bi₂WO₆ nanosheets into 50 mL of tetracycline solution at pH=8, 85% tetracycline (50 mL, 50 mg/L) was photodegraded within 130 min. The photoelectron-chemical experiments and free radical capture experiments were performed to explore the photo-degradation mechanism. The results show that good photocatalytic performance of Bi₂WO₆ nanosheets are ascribed to the high electron density and photoelectron-hole separation efficiency.

Key words: Bi₂WO₆ nanosheets, tetracycline, photocatalytic, visible light

CLC Number:

TQ174

WEI Xin, LU Zhanhui, WANG Luping, FANG Ming. Mechanism Study of Tetracycline High Efficient Photodegradation by Bi₂WO₆ Nanosheets under Visible Light Irradiation[J]. Journal of Inorganic Materials, 2020, 35(3): 324-328.

Figures/Tables 8

Fig. 1 XRD patterns of the sample prepared with different NaOH additions

Fig. 2 FESEM image (a), TEM image (b), HRTEM image (c), and Energy Dispersion Spectrum (d) of Bi2WO6 nanosheets

Fig. 3 UV-Vis absorption spectrum (a) and band gap plot of Bi2WO6 nanosheets (b)

Fig. 4 Photodegradation of tetracycline by products prepared with different NaOH additions (a), and corresponding curves of lnC0/C vs. time

Fig. 5 (a) Photodegradation of tetracycline in the solution with different pH and corresponding curves of lnC0/C vs. time (b) of Bi2WO6 nanosheets prepared with addition of 1 g NaOH

Fig. 6 Radical capturing experiments Triangle curve is the tetracycline photocatalytic experiments with adding Bi2WO6 nanosheets as photocatalysts, and circle curve is experiment without photocatalysts

Fig. 7 (a) Signal stability of photocurrent of Bi2WO6 nanosheets under visible light irradiation for four cycles and (b) Nyquist spectra of Bi2WO6 nanosheets

Fig. 8 CV curve of the Bi2WO6 nanosheets

References 20

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Mechanism Study of Tetracycline High Efficient Photodegradation by Bi₂WO₆ Nanosheets under Visible Light Irradiation

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