期刊
SEPARATION AND PURIFICATION TECHNOLOGY
卷 263, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.seppur.2021.118369
关键词
Amorphous CoO nanosheets; Peroxymonosulfate; Parachlorophenol; Catalytic degradation
资金
- National Natural Science Foundation of China [22006022]
- One Hundred Youth Science and Technology Plan, Guangdong University of Technology, China [220413320]
- Undergraduate Innovation and Entrepreneurship Training Program of Guangdong University of Technology [xj202011845264]
Amorphous CoO nanosheets were synthesized via NaBH4 reduction and showed superior catalytic performance in removing parachlorophenol when activated by PMS. The synergy of large surface area and amorphous structure of CoO nanosheets contributed to the enhanced degradation efficiency. Moreover, sulfate radicals were found to play a primary role in the oxidation of parachlorophenol in the CoO-A/PMS system.
Amorphous CoO nanosheets (CoO-A) were prepared in a short time and large scale for the first time via NaBH4 reduction, and applied as a catalyst for PMS activation to remove parachlorophenol (4-CP). Approximately 100% of 4-CP (10 mg/L) was degraded by PMS (0.25 mM) activated with CoO-A (0.03 g/L) with the kinetic constants of 0.428 min(-1), which was 5.7 and 214.0 times higher than crystalline CoO/PMS and Co3O4/PMS systems, respectively. The superior catalytic performance was ascribed to the synergy of large surface area and amorphous structure of CoO nanosheets. Moreover, the effects of water matrix species and reaction parameters on 4-CP degradation were systematically investigated. The hydroxyl radicals and sulfate radicals were detected and involved in CoO-A/PMS system for 4-CP oxidation, and sulfate radicals made the primary contribution. The redox circles of Co2+/Co3+ on CoO-A surface were mainly responsible for the catalytic activation of PMS, and the possible activation mechanism and degradation pathway were proposed.
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