期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 745, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.scitotenv.2020.141095
关键词
Advanced oxidation processes; Egg shell; Persulfate; 2, 4-Dichlorophenol; Resource recycling
资金
- National Natural Science Foundation of China [51579096, 51521006]
- Key Research and Development Program of Hunan Province of China [2017SK2241]
- Funds for Innovative Province Construction of Hunan Province of China
- National Innovative Talent Promotion Program of China [2019RS3012]
- [2017RA2088]
The sulfate radical based advanced oxidation processes (SR-AOPs) has shown great potential in environmental remediation. In recent years, metal-free catalysts have attracted great attention due to their properties of low environmental risk and high catalytic activity. Among them, biochar-based catalysts are widely studied for their low cost by using substance existing in nature as raw material. In this work, egg shell derived biochar (ES-biochar), which was prepared by a simple one-pot pyrolysis method, has been proven to bean effective and innovative catalyst to activate persulfate for aqueous organic pollutant degradation. In addition, ES-biochar showed superior performance in the degradation reaction with removal efficiency of more than 90% in 120 min for 2,4-dichlorophenol (2,4-DCP), which was selected as a representative organic pollutant. Further quenching tests and electron spin resonance spectroscopy demonstrated that both free-radicals and non-radicals pathways were involved in this process, and center dot OH dominated in free-radicals process. More importantly, this work not only proposed a novel biochar material as an efficient persulfate activator, but also provided a value-added reuse approach for egg shell in line with the concept of resource recycling and environmental sustainability. (C) 2020 Elsevier B.V. All rights reserved.
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