An anode fabricated by Co electrodeposition on ZIF-8/CNTs/CF for peroxymonosulfate (PMS) activation. (February 2023)

• Record Type: Journal Article
• Authors: Xie, Fangshu; Shi, Qiyu; Bai, Huiling; Liu, Meiyu; Zhang, Jingbin; Qi, Meiyun; Zhang, Jianfeng; Li, Zhihua; Zhu, Weihuang
• Is Part Of: Chemosphere. Volume 313(2023)
• Publication Date: 2023-02
• Subjects: Peroxymonosulfate (PMS) activation -- Anode modification -- The electrochemical advanced oxidation processes (AOPs) -- Radical transformation -- Tetracycline; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2022.137384
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: A Co@ZIF-8/CNTs-CF anode for PMS activation was prepared by Co electrodeposition on carbon felt (CF) modified with ZIF-8 and carbon nanotubes (CNTs). The results showed that the fabricated Co@ZIF-8/CNTs-CF anode was an effective peroxymonosulfate (PMS) activator toward tetracycline (TC) removal. Compared with that in reaction system of bare CF anode + PMS, the reaction system of Co@ZIF- 8/CNTs -CF anode + PMS exhibited 3.08 times decrease in the activation energy demanded and 4.21 times increase in the reaction rate constant ( k ), resulting in a kinetic favorable process of PMS activation by the Co@ZIF-8/CNTs-CF anode. The enhanced activation performance of the fabricated anode was ascribed to the high contents of the pyrrolic N and low valence state of Co in the Co@ZIF-8/CNTs-CF anode. Furthermore, the influence factors on the characteristics of transformation among the generated reactive species during the anodic PMS activation process were comprehensively investigated by the quenching experiments and the electron paramagnetic resonance (EPR) tests. The results showed that the SO4 - and reactive oxygen-containing reactive species (O2 - and 1 O2 ) were generated during the activation of PMS by anode and became the major contributors toward TC removal. The production of 1 O2 was through the dismutation of O2 - . In addition, the EPR experiments demonstrated that O2 - was generated mainly through the anodic PMS activation but the electrochemically driven molecular oxygen reduction reaction (ORR) process. The fabricated Co@ZIF-8/CNTs-CF anode for PMS activation provided a reference for the wastewater treatment based on the electrochemical advanced oxidation processes (EAOPs). Graphical abstract: Image 1 Highlights: A Co@ZIF-8/CNTs-CF anode for the effective PMS activation was prepared. The anodic PMS activation was kinetic favorable for TC removal. O2 . - was generated through the anodic PMS activation but the ORR process O2 . -, 1 O2 and SO4 - were major contributors toward TC removal