S-scheme Sb2WO6/g-C3N4 photocatalysts with enhanced visible-light-induced photocatalytic NO oxidation performance

doi:10.1016/S1872-2067(20)63631-2

Abstract

Abstract:

Normal photocatalysts cannot effectively remove low-concentration NO because of the high recombination rate of the photogenerated carriers. To overcome this problem, S-scheme composites have been developed to fabricate photocatalysts. Herein, a novel S-scheme Sb₂WO₆/g-C₃N₄ nanocomposite was fabricated by an ultrasound-assisted method, which exhibited excellent performance for photocatalytic ppb-level NO removal. Compared with the pure constituents of the nanocomposite, the as-prepared 15%-Sb₂WO₆/g-C₃N₄ photocatalyst could remove more than 68% continuous-flowing NO (initial concentration: 400 ppb) under visible-light irradiation in 30 min. The findings of the trapping experiments confirmed that •O₂^- and h⁺ were the important active species in the NO oxidation reaction. Meanwhile, the transient photocurrent response and PL spectroscopy analyses proved that the unique S-scheme structure of the samples could enhance the charge separation efficiency. In situ DRIFTS revealed that the photocatalytic reaction pathway of NO removal over the Sb₂WO₆/g-C₃N₄ nanocomposite occurred via an oxygen-induced route. The present work proposes a new concept for fabricating efficient photocatalysts for photocatalytic ppb-level NO oxidation and provides deeper insights into the mechanism of photocatalytic NO oxidation.

Key words: Sb₂WO₆, g-C₃N₄, S-scheme photocatalyst, Photocatalytic NO oxidation, In situ DRIFTS

Yuyu Ren, Yuan Li, Xiaoyong Wu, Jinlong Wang, Gaoke Zhang. S-scheme Sb₂WO₆/g-C₃N₄ photocatalysts with enhanced visible-light-induced photocatalytic NO oxidation performance[J]. Chinese Journal of Catalysis, 2021, 42(1): 69-77.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(20)63631-2

https://www.cjcatal.com/EN/Y2021/V42/I1/69

Figures/Tables 8

Fig. 1. XRD patterns (a), Raman spectra (b) and FT-IR spectra (c) of the Sb2WO6, g-C3N4, and 15-Sb2WO6/g-C3N4 samples.

Fig. 2. TEM (a), HRTEM (b), and HAADF-STEM (c) images and the corresponding EDS elemental mapping images (d-k) of the 15-Sb2WO6/g-C3N4 nanocomposite.

Fig. 3. XPS spectra of Sb2WO6, gC3N4, and 15-Sb2WO6/g-C3N4. (a) Survey spectra; (b) C 1s; (c) N 1s; (d) O 1s; (e) Sb 3d; (f) W 4f spectra.

Fig. 4. UV-vis diffuse reflection spectra of the as-prepared samples (a) and enlarged image (b) of the zone marked in (a); (Ahν)1/2 versus hν plots (c) and Mott-Schottky plots (d) of pure Sb2WO6 and g-C3N4.

Fig. 5. (a) Photocatalytic NO oxidation of the as-prepared samples; (b) Five consecutive runs of NO removal over the 15-Sb2WO6/g-C3N4 nanocomposite; XRD patterns (c) and FT-IR spectra (d) of 15-Sb2WO6/g-C3N4 nanocomposite before and after photocatalytic reaction.

Fig. 6. (a) PL spectra of g-C3N4 and Sb2WO6/g-C3N4 nanocomposites; Photocurrent responses (b) and EIS spectra (c) of Sb2WO6, g-C3N4, and 15-Sb2WO6/g-C3N4 samples; (d) Results of radical species trapping experiments of the 15-Sb2WO6/g-C3N4 sample and the removal of NO with different scavengers.

Fig. 7. In situ DRIFT spectra of the photocatalytic reaction of NO over 15-Sb2WO6/g-C3N4 nanocomposite under visible-light irradiation.

Fig. 8. S-scheme photocatalytic mechanism for Sb2WO6/g-C3N4 nanocomposite under visible-light irradiation.

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S-scheme Sb₂WO₆/g-C₃N₄ photocatalysts with enhanced visible-light-induced photocatalytic NO oxidation performance

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