Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 261, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2019.118214
Keywords
Oxygen vacancies; Cobalt oxide; Illite microsheets; Peroxymonosulfate; DFT calculations
Funding
- National Postdoctoral Program for Innovative Talents [BX20190370]
- Yueqi Funding Scheme for Young Scholars (China University of Mining &Technology, Beijing)
- Young Elite Scientists Sponsorship Program by CAST [2017QNRC001]
- Fundamental Research Funds for the Central Universities [2015QH01, 2010YH10]
- China Scholarship Council (CSC) [201806430041]
- University of Cincinnati through a UNESCO
- Herman Schneider Professorship in the College of Engineering and Applied Sciences
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Natural illite microsheets were firstly utilized to induce oxygen vacancies into ultrafine cobalt oxide (Co3O4) for highly efficient Fenton-like catalysis via activation of peroxymonosulfate (PMS). The results indicated that presence of illite microsheets regulated multi-directional crystallization of Co3O4 nanospheres and resulted in reduced grain size and crystallinity. The smaller grain size provided more reactive edge sites for PMS catalysis. The numerous indistinct lattice boundaries caused by reduced crystallinity created abundant oxygen vacancies. Density functional theory (DFT) calculations illustrated that presence of oxygen vacancies significantly reduced adsorption energy and accelerated electron transfer, which further faciliated PMS activation. The oxygen vacancy-rich Co3O4/illite exhibited superior catalytic efficiency in real water matrix. Apart from sulfate and hydroxyl radicals, singlet oxygen generated from oxygen vacancy-based reaction pathway also played a significant role in atrazine degradation. This strategy provided a new insight for future designing of natural mineral-based catalysts for efficient wastewater treatment via Fenton-like process.
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