期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 435, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2022.129013
关键词
Co(II)-dopedCeO(2); DFT calculations; Enhanced catalytic efficiency; Degradation mechanism; Ecotoxicological assessment
资金
- Environmental Protection Department of Hubei Province [2017HB04]
- Fundamental Research Funds for the Central Universities, China University of Geo-sciences (Wuhan) [CUG170102]
A series of Co(II)-CeO2 mixed metal oxides were synthesized and used as catalysts for activating peroxymonosulfate (PMS) and degrading difficult biodegradable organics. The catalyst showed excellent degradation performance for various pollutants and achieved improvements compared to previous studies.
A series of Co(II)-CeO2 mixed metal oxides were synthesized by a facile hydrothermal-calcination procedure for activating peroxymonosulfate (PMS) and degrading toxic and difficult biodegradable organics. Co(II)-CeO2 showed excellent degradation performance toward rhodamine B (RhB), toluidine blue, methylene blue and diclofenac. RhB is a refractory organic contaminant, and ecotoxicological evaluation unraveled its harmfulness to the biosphere. RhB was selected as the model pollutant to investigate catalytic mechanisms. Parameters affecting degradation performance were profoundly investigated, including Co:Ce feed ratio, initial pH, PMS dosage, catalyst dosage, RhB concentration, coexisting ions and reaction temperature. Reaction mechanisms were pro-posed based on density functional theory calculations and identifications of reactive oxygen species. Improve-ments have been achieved in seven aspects compared to previous studies, including 100% degradation ratio in both real water samples and each reuse of the catalyst, ultrafast degradation rate, cost-effectiveness of the catalyst, toxicity-attenuation provided by the developed degradation method, high degree of mineralization for the model pollutant, negligible leaching of active sites, and the enhancement of catalytic performance by uti-lizing trace leached cobalt, endowing the technique with broad applicability and prospect.
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