期刊
CHEMICAL ENGINEERING JOURNAL
卷 435, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2022.134882
关键词
Sulfadiazine; Peroxymonosulfate; Singlet oxygen; Compound specific mechanism; Cu-doped LaFeO3
资金
- National Natural Science Foundation of China [41877480]
This study investigates the degradation reaction mechanisms of organic pollutants by peroxymonosulfate (PMS) activation processes using Cu-doped LaFeO3 samples as catalysts. The generated oxygen vacancies contribute to the enhanced catalytic activity of LaFe1-xCuxO3 samples. Detection of hydroxyl radicals, sulfate radicals, superoxide, and singlet oxygen in the LFCO-7.5/PMS system suggests compound-specific degradation mechanisms. Additionally, the study explores the degradation pathways of sulfadiazine (SDZ) and the evolution of its toxicity.
The degradation reaction mechanisms of organic pollutants by peroxymonosulfate (PMS) activation processes remain controversial. In this study, Cu-doped LaFeO3 samples were prepared and used as heterogeneous catalysts of PMS for the degradation of pharmaceuticals. Compared to LaFeO3 (LFO), the increased catalytic activity of LaFe1-xCuxO3 (LFCO) samples was observed, among which LFCO-7.5 exhibited the best performance. The enhanced catalytic activity of LFCO-7.5 was attributable to the generation of abundant oxygen vacancies. Hydroxyl radicals, sulfate radicals, superoxide and singlet oxygen were detected in the LFCO-7.5/PMS system. However, selective effects of radical scavengers on the degradation of different pharmaceuticals and selective reactivity of singlet oxygen toward different pharmaceuticals indicate the existence of compound-specific degradation mechanisms in the LFCO-7.5/PMS system. Furthermore, possible degradation pathways of SDZ and the toxicity evolution were investigated during sulfadiazine (SDZ) degradation. This study further enhances our knowledge on the degradation reaction mechanisms of organic pollutants in PMS activation processes.
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