期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 416, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2021.125804
关键词
Electrochemically activated PS; Atrazine degradation; Divided and undivided cell; Radical and non-radical oxidation
资金
- Tianjin Science and Technology Program [19PTZWHZ00050]
- Natural Science Foundation of China [21976096, 21773129, 21811530274]
- National Key Research and Development Program [2016YFC0400706]
- Fundamental Research Funds for the Central Universities, Nankai University
- Tianjin Development Program for Innovation and Entrepreneurship
Different cathode materials showed varied efficiency in degrading atrazine during electrochemically activated persulfate degradation experiment, with quenching studies and detection of intermediates revealing the degradation pathway.
Electrochemically activated persulfate (PS) employing stainless steel (SS), carbon felt (CF) and carbon black modified CF (CB-CF) as the cathode, in the divided and undivided cell, respectively, for degradation of atrazine (ATZ) was first investigated using novel B, Co-doped TiO2 nanotubes (B, Co-TNT) anode. In undivided cell, ATZ degradation was followed the order of CF < CB-CF < SS. The main radical for ATZ removal in SS and CF system was 'OH, while on CB-CF cathode, it was the comprehensive contribution of 'OH and SO4'-. 'OH in SS system was more inclined to free 'OH, while in CF and CB-CF systems it was more likely to be surface 'OH. In divided anode cell, 'OH was responsible for ATZ degradation in all three cathodes system. However, in divided cathode cell, 'OH played a major role for ATZ degradation in SS cathode system. In CF and CB-CF cathode systems, the ATZ degradation was the comprehensive effect of 'OH and SO4'- with the contribution of 'OH and SO4'- was 91.7%, 8.3%, and 96.3%, 3.6%, respectively. The quenching studies showed that non-radical oxidation occurred in anode chamber in the presence of PS. Besides, the intermediates in divided and undivided cell were detected by LC-MS, and the possible degradation pathway was proposed.
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