Interface-engineered cavity-structured cobalt oxide as a boosted activator for peroxymonosulfate to degrade environmental hormones in water: Structural defects and oxygen vacancies-induced enhancement

Duong Dinh Tuan, Ngoc Hieu Nguyen, Nguyen Van Quang, Young Kwon Park, Chia Hua Lin, Suresh Ghotekar, Haitao Wang, Wei Hsin Chen, Yeoh Fei Yee, Kun Yi Andrew Lin

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

While heterogeneous cobalt (Co) catalysts are useful peroxymonosulfate (PMS) activators, the development of a heterogeneous Co-based catalyst with intriguing physicochemical properties and outstanding catalytic activities is still of great interest. Herein, a unique cavity-structured grassy-like cobalt oxide (Co3O4) (CGCO) is proposed and fabricated through two-step modifications of partial sculpting and calcination using Co-based metal organic framework (Co-MOF) as an initial precursor. The as-prepared CGCO exhibits a cavity structure covered by grassy-like outer shells, thus possessing special physicochemical properties and enriched oxygen vacancy. These features enable CGCO a much more advantageous activator than commercial Co3O4 for activating PMS, and would efficiently remove 100% of bisphenol A (BA) rapidly. The activation energy (Ea) of BA degradation by CGCO+PMS is only 31.2 kJ/mol, which is lower than the recently-reported values. The density function theory calculation is performed to investigate the degradation pathway, and the corresponding eco-toxicity is also studied to realize the environmental implication of BA by CGCO-activated PMS as the toxicities and environmental impact of BA are significantly reduced. This work provides valuable information in term of preparation strategy of cavity structured metal oxide materials, which should be propitious for the degradation of environmental hormones via advanced oxidation reactions.

Original languageEnglish
Article number110789
JournalJournal of Environmental Chemical Engineering
Volume11
Issue number5
DOIs
StatePublished - Oct 2023

Keywords

  • Bisphenol A
  • Cobalt
  • Cobalt oxide
  • Oxidation
  • Oxygen vacancy
  • PMS

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