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Interfacial bonding of Co3O4 and oxygen vacancies engineering on ZnO induced efficient peroxymonosulfate activation and pollutants degradation.

Authors :
Xie, Hengyi
Zhang, Gangsheng
Xu, Jixiang
Lin, Haifeng
Xing, Jun
Wang, Lei
Source :
Journal of Colloid & Interface Science. Nov2024, Vol. 674, p813-822. 10p.
Publication Year :
2024

Abstract

[Display omitted] A heterojunction of trace Co 3 O 4 bonded on oxygen vacancies (OVs)-rich ZnO (OVs-ZnO/Co 3 O 4) was synthesized via defect-assisted method to promote peroxymonosulfate (PMS) activation and pollutants degradation. Experiments and theoretical calculations demonstrated that electrons could efficiently transfer from OVs-ZnO to Co 3 O 4. OVs-ZnO and Co 3 O 4 played different roles in activating PMS. PMS was easily adsorbed on the OVs-ZnO to form PMS* complex and mediated electron transfer to oxide ciprofloxacin (CIP), whereas, Co 3 O 4 facilitated breakup of peroxide bond to produce radicals. The optimal OVs-ZnO/Co 3 O 4 with Co content of 1.34% exhibited good PMS decomposition ability (94.2% in 30 min) compared to unmodified ZnO (24.2%), stability and anti-interference feature in removing CIP, 96.9% CIP (10 ppm) and 79.6% of total organic carbon were removed in 30 min. Moreover, the OVs-ZnO/Co 3 O 4 achieved 91.2% CIP removal ratio with 1.0 mM PMS via a flow-through device in 180 min. This study proposes a new strategy to enhance PMS activation of ZnO and provides new viewpoint in PMS activation way. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
00219797
Volume :
674
Database :
Academic Search Index
Journal :
Journal of Colloid & Interface Science
Publication Type :
Academic Journal
Accession number :
178884789
Full Text :
https://doi.org/10.1016/j.jcis.2024.06.224