Generating 1O2 and CoIV=O through efficient peroxymonosulfate activation by ZnCo2O4 nanosheets for pollutant control

Xiaoke Zhang, Yangyang Zhang, Jiaqi Tian, Yadan Guo, Zhongkui Zhou, Zhongyi Liu*, Zaiwang Zhao, Bin Liu, Jun Li*

*Corresponding author for this work

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

12 Citations (Scopus)

Abstract

Heterogeneous advanced oxidation processes (AOPs) based on non-radical reactive species are considered as a powerful technology for wastewater purification due to their long half-lives and high adaptation in a wide pH range. Herein, we fabricate surface Co defect-rich spinel ZnCo2O4 porous nanosheets, which can generate ≡CoIV=O and 1O2 over a wide pH range of 3.81–10.96 by the formation of amphoteric ≡Zn(OH)2 in peroxymonosulfate (PMS) activation process. Density functional theory (DFT) calculations show Co defect-rich ZnCo2O4 possesses much stronger adsorption ability and more electron transfer to PMS. Moreover, the adsorption mode changes from terminal oxygen Co–O–Co to Co–O, accelerating the polarization of adjacent oxygen, which is beneficial to the generation of ≡CoIV=O and 1O2. Co defect-rich ZnCo2O4 porous nanosheets exhibit highly active PMS activation activity and stability in p-nitrophenol (PNP) degradation, whose toxicity of degradation intermediates is significant reduction. The Co defect-rich ZnCo2O4 nanosheet catalyst sponge/PMS system achieved stable and efficient removal of PNP with a removal efficiency higher than 93% over 10 h. This work highlights the development of functional catalyst and provides an atomic-level understanding into non-radical PMS activation process in wastewater treatment. (Figure presented.) © Tsinghua University Press 2024.
Original languageEnglish
Pages (from-to)8025-8035
JournalNano Research
Volume17
Issue number9
Online published25 Jul 2024
DOIs
Publication statusPublished - Sept 2024

Research Keywords

  • advanced oxidation processes
  • CoIV=O
  • peroxymonosulfate activation
  • wastewater treatment
  • ZnCo2O4 nanosheets

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