S-Scheme photocatalyst TaON/Bi2WO6 nanofibers with oxygen vacancies for efficient abatement of antibiotics and Cr(VI): Intermediate eco-toxicity analysis and mechanistic insights

doi:10.1016/S1872-2067(22)64106-8

Abstract

Abstract:

Enlightened by natural photosynthesis, developing efficient S-scheme heterojunction photocatalysts for deleterious pollutant removal is of prime importance to restore environment. Herein, novel TaON/Bi₂WO₆ S-scheme heterojunction nanofibers were designed and developed by in-situ growing Bi₂WO₆ nanosheets with oxygen vacancies (OVs) on TaON nanofibers. Thanks to the efficiently spatial charge disassociation and preserved great redox power by the unique S-scheme mechanism and OVs, as well as firmly interfacial contact by the core-shell 1D/2D fibrous hetero-structure via the in-situ growth, the optimized TaON/Bi₂WO₆ heterojunction unveils exceptional visible-light photocatalytic property for abatement of tetracycline (TC), levofloxacin (LEV), and Cr(VI), respectively by 2.8-fold, 1.0-fold, and 1.9-fold enhancement compared to the bare Bi₂WO₆, while maintaining satisfactory stability. Furthermore, the systematic photoreaction tests indicate TaON/Bi₂WO₆has the high practicality in the elimination of pollutants in aquatic environment. The degradation pathway of tetracycline and intermediate eco-toxicity were determined based on HPLC-MS combined with QSAR calculation, and a possible photocatalytic mechanism was elucidated. This work provides a guideline for designing high-performance TaON-based S-scheme photocatalysts with defects for environment protection.

Key words: TaON/Bi₂WO₆, S-Scheme heterojunction, Electrospinning, Oxygen vacancy, Antibiotic degradation, Cr(VI) reduction

Shijie Li, Mingjie Cai, Yanping Liu, Chunchun Wang, Kangle Lv, Xiaobo Chen. S-Scheme photocatalyst TaON/Bi₂WO₆ nanofibers with oxygen vacancies for efficient abatement of antibiotics and Cr(VI): Intermediate eco-toxicity analysis and mechanistic insights[J]. Chinese Journal of Catalysis, 2022, 43(10): 2652-2664.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(22)64106-8

https://www.cjcatal.com/EN/Y2022/V43/I10/2652

Figures/Tables 11

Fig. 1. A scheme of the synthesis procedure of TON/BWO heterojunction nanofibers.

Fig. 2. XRD patterns of TON, BWO, and TON/BWO heterojunctions.

Fig. 3. SEM images of TON (a,e), TON/BWO-1 (b,f), TON/BWO-2 (c,g), and TON/BWO-3 (d,h). TEM images (i,j), and HRTEM image (k) of TON/BWO-2.

Fig. 4. XPS survey spectrum (a) and high resolution XPS spectra of Ta 4f (b), N 1s (c), Bi 4f (d), W 4f (e), and O 1s (f) of TON, BWO and TON/BWO-2.

Fig. 5. The photocatalytic property of TON, BWO and TON/BWO heterojunctions in TC degradation (a) and photoreaction kinetics under visible light (b). Impact of some pivotal parameters: catalyst dosage (c), ions (C = 0.05 mol/L) (d), and water matrices (e), on the TC abatement efficacy over TON/BWO-2. (f) Recycle test on TC degradation over TON/BWO-2. The photocatalytic activity of TON, BWO and TON/BWO-2 in LEV degradation (g) and photoreaction kinetics under visible light (h). (i) Recycle test on LEV abatement over TON/BWO-2.

Fig. 6. TC decomposition routes over TON/BWO-2 (a), daphnia magna LC50 (b), fathead minnow LC50 (c), and developmental toxicity evaluation (d).

Fig. 7. (a) The photocatalytic property of TON, BWO and TON/BWO-2 in Cr(VI) reduction and (b) reaction kinetics under visible light. The influence of pH (c) and water bodies (d) on Cr(VI) reduction efficiency over TON/BWO-2.

Fig. 8. Photocatalytic removal of TC (a) and of Cr(VI) (b) with the introduction of various trapping agents over TON/BWO-2. ESR spectra of the DMPO-•O2- (c) and DMPO-•OH (d) over TON, BWO and TON/BWO-2 with 5 min of visible-light illumination. (e) A scheme of the reactor with the separation dialysis bag. (f) Percentages of TC inside and outside the dialysis bag.

Fig. 9. TPR (a), and EIS (b) plots of BWO, TON and TON/BWO heterojunctions. (c) PL of BWO and TON/BWO heterojunctions. (d) TRPL of BWO and TON/BWO-2.

Fig. 10. (a) UV-Vis DRS spectra of BWO, TON and TON/BWO heterojunctions. Tauc plots (b), Mott-Schottky plots (c), and band structures (d) of BWO and TON. (e) EPR spectra of BWO, TON and TON/BWO-2. (f) UPS spectra of BWO and TON.

Fig. 11. Mechanistic illustration of the photocatalytic abatement of antibiotics and Cr(VI) in the TON/BWO system under visible light.

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S-Scheme photocatalyst TaON/Bi₂WO₆ nanofibers with oxygen vacancies for efficient abatement of antibiotics and Cr(VI): Intermediate eco-toxicity analysis and mechanistic insights

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