2D/2D step-scheme α-Fe2O3/Bi2WO6 photocatalyst with efficient charge transfer for enhanced photo-Fenton catalytic activity

doi:10.1016/S1872-2067(20)63602-6

Abstract

Abstract:

Although the traditional Fenton reaction is considered an effective strategy for solving problems caused by environmental pollution, construction of an efficient photocatalytic system by coordinating the Fenton reaction is challenging. In this study, 2D/2D step-scheme α-Fe₂O₃/Bi₂WO₆ (FO/BWO) heterostructure photo-Fenton catalysts were successfully fabricated by a facile hydrothermal method. The as-prepared materials were characterized by XRD, FT-IR, TEM, XPS, UV-vis DRS, PL, I-t, EIS, and BET analyses. Under visible light irradiation, FO/BWO exhibited remarkably high and stable photo-Fenton catalytic activity for the degradation of methyl blue (MB) at low concentrations of H₂O₂. It was noted that FO/BWO (0.5) displayed a significantly enhanced photo-Fenton catalytic activity, which was 11.06 and 3.29 times those of FO nanosheets and BWO nanosheets, respectively. The notably improved photo-Fenton catalytic activity of FO/BWO was mainly due to the combination of H₂O₂ and FO under light illumination and the presence of the 2D/2D S-scheme heterostructure, with the large contact surface, abundant active sites, and efficient separation rate of photogenerated carriers playing contributory roles. Additionally, a possible catalytic mechanism for the FO/BWO composite was preliminarily proposed via active species trapping experiments. In summary, this study provided new insights into the synthesis of an effectively heterogeneous 2D/2D S-scheme photo-Fenton catalyst for degradation of organic pollutants in wastewater.

Key words: Bi₂WO₆, α-Fe₂O₃, S-scheme, Photo-Fenton, 2D photocatalyst

Wenliang Wang, Wenli Zhao, Haochun Zhang, Xincheng Dou, Haifeng Shi. 2D/2D step-scheme α-Fe₂O₃/Bi₂WO₆ photocatalyst with efficient charge transfer for enhanced photo-Fenton catalytic activity[J]. Chinese Journal of Catalysis, 2021, 42(1): 97-106.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(20)63602-6

https://www.cjcatal.com/EN/Y2021/V42/I1/97

Figures/Tables 12

Fig. 1. X-ray diffraction patterns of BWO, FO, FO/BWO (1), FO/BWO (0.5) and FO/BWO (0.3) photocatalysts.

Fig. 2. TEM images of (a-b) FO, (c-d) BWO, (e) FO/BWO (0.5) composite and (f) HRTEM image of FO/BWO (0.5) composite.

Fig. 3. XPS spectra of BWO, FO and FO/BWO (0.5) samples: (a) survey, (b) O 1s, (c) W 4f, (d) Bi 4f and (e) Fe 2p.

Fig. 4. UV-vis spectra of BWO, FO, FO/BWO (0.5), FO/BWO (0.3) and FO/BWO (1) photocatalysts.

Fig. 5. FT-IR spectra of BWO, FO, FO/BWO (1), FO/BWO (0.3) and FO/BWO (0.5) photocatalysts.

Fig. 6. (a) Dynamic curves of photodegradation for MB solution over different samples, (b) kinetic fitting of the photodegradation for MB solution over different samples, (c) degradation rate of the MB solution after 25 min. (d) degradation of MB under different reaction conditions.

Fig. 7. (a) XRD patterns of FO/BWO (0.5) photocatalyst before and after photodegradation experiment. (b) The recyclability of FO/BWO (0.5) for photocatalytic degradation of MB.

Fig. 8. Photoluminescence emission spectra for FO, BWO and FO/BWO (0.5) photocatalysts. The wavelength of excitation light for fluorescence emission spectra was 327 nm.

Fig. 9. Transient photocurrent responses for the FO, BWO and FO/BWO (0.5) composite.

Fig. 10. EIS Nyquist plots of FO, BWO and FO/BWO (0.5) composite.

Fig. 11. Comparison of the effect of different radical scavengers during photocatalytic degradation of MB over FO/BWO (0.5) composite under visible light irradiation (λ ≥ 400 nm).

Fig. 12. Schematic diagram of the photocatalytic oxidation of MB over FO/BWO (0.5) under visible-light irradiation (λ ≥ 400 nm).

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2D/2D step-scheme α-Fe₂O₃/Bi₂WO₆ photocatalyst with efficient charge transfer for enhanced photo-Fenton catalytic activity

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