Floatable S-scheme Bi2WO6/C3N4/carbon fiber cloth composite photocatalyst for efficient water decontamination

doi:10.1016/S1872-2067(23)64496-1

Abstract

Abstract:

The development of easily recyclable and advanced photosystems is a promising strategy for achieving sustainable water decontamination in industrial applications. In this study, a flexible, floatable, and easily recyclable S-scheme photosystem of oxygen vacancy (OV)-rich Bi₂WO₆/C₃N₄/carbon fiber cloth (BWOV/CN/CF) was fabricated via sequential in situ growth of C₃N₄ and Bi₂WO₆ with oxygen vacancies on CF cloth. The integrated BWOV/CN/CF photosystem exhibited outstanding photocatalytic decontamination rates for TC (0.0353 min^‒1) and Cr(VI) (0.0187 min⁻¹), significantly exceeding CN/CF by 0.5 and 30.2 folds, respectively. This appreciable improvement is derived from the unique hierarchical S-scheme heterostructure with OV, which enables the enhanced capability of BWOV/CN/CF in light use and powerful photocarrier detachment, as well as offering abundant active centers. Significantly, the BWOV/CN/CF cloth shows intriguing industrial application prospects owing to its high anti-interference properties, broad pH applicability, good durability, easy recycling and operation, and extensive adaptability for diverse contaminant purification. Furthermore, the photocatalytic TC decomposition process, by-product biotoxicity, and photocatalysis mechanism were systematically evaluated. The ingenious design of floatable cloth-shaped photosystems offers an effective strategy for environmental purification.

Key words: Bi₂WO₆/C₃N₄/carbon cloth, Oxygen vacancy, S-scheme, Floatable photocatalyst, Recyclability, Internal electric field

Mingjie Cai, Yanping Liu, Kexin Dong, Xiaobo Chen, Shijie Li. Floatable S-scheme Bi₂WO₆/C₃N₄/carbon fiber cloth composite photocatalyst for efficient water decontamination[J]. Chinese Journal of Catalysis, 2023, 52: 239-251.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(23)64496-1

https://www.cjcatal.com/EN/Y2023/V52/I9/239

Figures/Tables 6

Fig. 1. (a) The synthetic routes for OVs-rich BWOV/CN/CF S-scheme materials. (b) XRD patterns of CN, CN/CF, CF, BWOV, BWOV/CF and BWOV/CN/CF. (c) FTIR spectra of CN/CF, BWOV/CF and BWOV/CN/CF. XPS spectra (d) Bi 4f, (e) W 4f, (f) O 1s, and (g) N 1s.

Fig. 2. The photo (a) and SEM images (b-d) of CF; the photo (e) and SEM images (f-h) of CN/CF; the photo (i), SEM images (j-l), EDS mapping (m), and TEM images (n-q) of BWOV/CN/CF.

Fig. 3. (a) Time course of photocatalytic TC purification activity over different clothes under visible light. The TC eradication efficiency of BWOV/CN/CF cloth under various cloth sizes (b), anions (c), and water environment(d). (e) Cyclic tests of photocatalytic TC destruction by BWOV/CN/CF cloth. (f) ROS capturing tests on TC elimination over BWOV/CN/CF cloth. (g,h) ESR analyses. (i) Time course of photocatalytic Cr(VI) eradication activity over different clothes under visible light. (j) Cyclic tests of photocatalytic Cr(VI) eradication by BWOV/CN/CF cloth. (k) Cr(VI) treatment performances of BWOV/CN/CF cloth in real water. (l) ROS scavenging tests on Cr(VI) mitigation over BWOV/CN/CF cloth.

Fig. 4. (a) Photo-decomposition routes of TC over BWOV/CN/CF cloth. (b,c) Toxicity assessment.

Fig. 5. (a) UV/Vis DRS of CN/CF, BWOV/CF, and BWOV/CN/CF. Kubelka-Munk plots (b), Mott-Schottky plots (c), schema of the redox potentials (d), UPS spectra (e,f), and VB-XPS patterns (g) of CN and BWOV. TPR (h) and EIS plots (i) of CN/CF, BWOV/CF, and BWOV/CN/CF.

Fig. 6. Possible mechanism of photocatalytic water decontamination over the BWOV/CN/CF cloth.

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Floatable S-scheme Bi₂WO₆/C₃N₄/carbon fiber cloth composite photocatalyst for efficient water decontamination

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