Hydrophilic regulated photocatalytic converting phenol selectively over S-scheme CuWO4/TiO2. (1st October 2022)

• Record Type: Journal Article
• Authors: Bai, Xue; Fu, Zhongyuan; Ma, Xinyi; Zhang, Zhe; Fan, Jun; Liu, Enzhou; Li, Jianli
• Is Part Of: Journal of cleaner production. Volume 369(2022)
• Publication Date: 2022-10-01
• Subjects: S-Scheme heterojunction -- TiO2 -- CuWO4 -- Hydrogen evolution -- Converting phenol selectively; Factory and trade waste -- Management -- Periodicals; Manufactures -- Environmental aspects -- Periodicals; Déchets industriels -- Gestion -- Périodiques; Usines -- Aspect de l'environnement -- Périodiques; 628.5
• DOI: 10.1016/j.jclepro.2022.133099
• Languages: English
• ISSNs: 0959-6526

Abstract

Abstract: Heterojunction construction is regarded to be among the most promising pathways for photocatalytic H2 evolution and organic conversion. Herein, precursor of CuWO4 (P-CWO) and CuWO4 (CWO) were fabricated via low temperature hydrothermal as well as high temperature calcination method, respectively. P–CuWO4 /TiO2 (P-CWO/T) and CuWO4 /TiO2 (CWO/T) heterojunctions were consequently obtained through simple mechanical mixing with TiO2 . In light the S-scheme electron-hole separation and superior photocatalytic redox ability, the H2 evolution rate was found to increase to 6169.25 and 6026.8 μmol g −1 ·h −1, which was over 26 times higher than that of pure TiO2 under a 300 W Xe lamp in the range of 350–780 nm. P-CWO/T tend to produce more ·OH due to the surface bound H2 O and hydroxyl ligand. Particularly, closely related to the proportion of ·OH and ·CH3 active radicals, selective conversion of phenol can be controlled to 4-hydroxy-3-methylbenzoic acid and 2-methylbenzene-1, 4-diol respectively. This work not only presents unique S-scheme heterojunction in improving photocatalytic efficiency but also offers a selective route for the conversion of phenol in the perspective of active free radicals. Graphical abstract: Photogenic radical pathway of P-CWO/T and CWO/T S-scheme heterojunction and the mechanism for photocatalytic H2 evolution and selective organic conversion. Image 1 Highlights: Hydrophilic regulated S-scheme CuWO4 /TiO2 nanocomposites construction. Exploring the relationship between ·OH producing and surface bound H2 O was first reported. CuWO4 /TiO2 photocatalytic converting phenol selectively in the perspective of active free radicals.