Novel insights into Co synergy and electron-transfer pathways during the oxidation of contaminants by Cu-OOSO3- in CuCo2Ox/peroxymonosulfate system. Issue 2 (April 2023)

• Record Type: Journal Article
• Authors: Zhao, Lele; Zhang, Jiaming; Zong, Yuan; Ma, Jun; Bai, Chengying; Zhang, Hexin; Ren, Yueming
• Is Part Of: Journal of environmental chemical engineering. Volume 11:Issue 2(2023)
• Publication Date: 2023-04
• Subjects: CuCo2Ox catalyst -- Peroxymonosulfate -- Synergistic effect -- 6Cu-OOSO3- intermediate -- Electron-transfer pathways; Chemical engineering -- Environmental aspects -- Periodicals; Environmental engineering -- Periodicals; Chemical engineering -- Environmental aspects; Environmental engineering; Periodicals; 660.0286
• DOI: 10.1016/j.jece.2023.109594
• Languages: English
• ISSNs: 2213-2929

Abstract

Abstract: Recently, the Cu-OOSO3 - metastable intermediate have been proposed to be the main active substance of contaminant oxidation, which could degrade organics through oxygen-atom-transfer and single-electron-transfer pathways. Herein, a series of copper cobalt oxides was synthesized to further explore its active species and electron-transfer pathways in the PMS activation system. The CuCo2 Ox precipitated a smaller nano-needle structure, more weak acid sites, and more Cu 2+ and Co 2+ contents on its surface. Notably, it exhibited excellent PMS activation performance due to the synergistic effect between Cu and Co. The single-electron-transfer pathway with radicals and singlet oxygen as active species participated in the oxidation reaction, and the oxygen-atom-transfer pathway also played an important role in the degradation of pollutants. Cu 2+ was speculated to be the main active site for binding with PMS to form the Cu-OOSO3 - active substances due to its strong complex ability. And the electron transfer of the Cu-O-Co bridge bond promoted an oxidation reaction between Cu-OOSO3 - and the contaminant. Hence, this work provided new insights into the synergistic effect between Cu and Co sites and electron-transfer pathways of contaminants oxidation in the CuCo2 Ox /PMS oxidation system. Graphical Abstract: ga1 Highlights: Copper cobalt oxide catalysts were synthesized and used as PMS activators. CuCo2 Ox exhibited excellent performance due to the synergy of Cu and Co. Cu 2+ acted as an active site, Co 2+ /Co 3+ acted as electron storage and transfer reservoir. Cu-OOSO3 - was supposed as the main active substance for BPA degradation. Organics were decomposed via oxygen-atom-transfer and single-electron-transfer.