Constructing S/N-vacancy-and Co/Mo-bimetallic-catalysts for tetracycline degradation through peroxymonosulfate activation: evolution of active substance
File(s)
Accepted version
Supporting information
Author(s)
Yang, Jiaqi
Yang, Yu
Gao, Kexuan
Graham, Nigel JD
Hou, Li-an
Type
Journal Article
Abstract
Regulation of the types and content of reactive oxygen species (ROS) in advanced oxidation processes (AOPs) is regarded as a challenging task. Herein, the features of sulfur-vacancy (Sv) and nitrogen-vacancy (Nv), and cobalt (Co)/molybdenum (Mo)-bimetallic constituents were simultaneously incorporated into a novel Co-N@MoS2-COOH catalyst through a simple hydrothermal calcination method. The adsorption of oxygen (O2) and peroxymonosulfate (PMS) was promoted by Sv/Nv, whereby the generation of superoxide radical (O2·-) and singlet oxygen (1O2) species was induced, and the energy barrier for the formation of high-valent cobalt-oxo species (Co(IV)=O) was reduced. The decomposition of PMS was enhanced by a bimetal (Mo/Co) electronic pump and the O2·-, 1O2, and Co(IV)=O active species degraded tetracycline (TC) together to achieve an efficient degradation rate (initial Kobs = 0.490 min−1). The degradation intermediates and potential degradation pathways were identified, and the leaching of Co was within the acceptable range of environmental standards. Incorporation of the catalyst into a microfilter membrane achieved a 100 % degradation of TC at an ultra-high membrane flux (1803.4 LMH/bar). This study provided new insights into the types of ROS regulated by bi-vacancy and bimetallic catalysts in AOP systems, with the intention of promoting a more sustainable and resource-efficient treatment technology.
Date Issued
2025-10-01
Date Acceptance
2025-06-01
Citation
Environmental Research, 2025, 282
ISSN
0013-9351
Publisher
Elsevier BV
Journal / Book Title
Environmental Research
Volume
282
Copyright Statement
Copyright © 2025 Elsevier Inc. This is the author’s accepted manuscript made available under a CC-BY licence in accordance with Imperial’s Research Publications Open Access policy (www.imperial.ac.uk/oa-policy)
License URL
Publication Status
Published
Article Number
122051
Date Publish Online
2025-06-04