Bimetallic CuMo@TiO2 activating peroxymonosulfate for micropollutants degradation: Synergy and mechanism. Issue 2 (April 2023)

• Record Type: Journal Article
• Authors: Dai, Xinning; Liu, Zhujun; Wang, Jun; Zhang, Ke; Ma, Dandan; Chen, Wei; Zheng, Huaili
• Is Part Of: Journal of environmental chemical engineering. Volume 11:Issue 2(2023)
• Publication Date: 2023-04
• Subjects: Bimetallic -- Singlet oxygen -- PMS activation -- Synergistic mechanism -- Mineralization; Chemical engineering -- Environmental aspects -- Periodicals; Environmental engineering -- Periodicals; Chemical engineering -- Environmental aspects; Environmental engineering; Periodicals; 660.0286
• DOI: 10.1016/j.jece.2023.109304
• Languages: English
• ISSNs: 2213-2929

Abstract

Abstract: Bimetallic catalysts and single metal photo-catalytic products displayed excellent PMS-activated ability for a long time. However, the synergistic mechanism of bimetallic with photo-generated electrons and the mechanism of 1 O2 generation and conversion were still obscure. In this work, CuMo@TiO2 was coupled with PMS to confirm the synergistic effect of Cu-Mo bimetallic with photo-generated electrons and this effect on the generation and conversion of ROS. IDM (20 ppm) almost achieved complete degradation in CuMo@TiO2 /PMS system within 30 min, and the reaction system remained efficient with the presence of common inorganic anions or over a wide pH range (5.0–8.0). Experimental and analysis demonstrated that Cu-Mo bimetallic provided metal activation sites for PMS activation and those activation sites derived electron transfer enhanced the radical and non-radical pathway. Photo-generated electrons offered a powerful driving force for the redox of Cu-Mo bimetallic. The photo-generated electrons under the solar light and increased electron transfer between Cu-Mo promoted the generation and conversion of active species ( . OH, O2 ·-, SO4 ·-, SO5 ·- ) to 1 O2 . This work provides the theoretical and experimental foundation for the further research of bimetallic photo-catalytic systems. Graphical Abstract: ga1 Highlights: A novel catalyst CuMo@TiO2 was designed and synthesized. Synergistic interaction of Cu-Mo bimetal promoted activated efficiency. Photo-generated electrons facilitated the redox of Cu-Mo bimetal. 1 O2 derived from the conversion of other active species. Mo act as a facilitator and changed the main active species in PMS system.