期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 599, 期 -, 页码 1181-1190出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.scitotenv.2017.05.037
关键词
Natural maghemite; Peroxydisulfate activation; Microbial fuel cell; Sulfate radical; Singlet oxygen
资金
- National Natural Science Foundation of China [21547006]
- Wuhan Applied Basic Research Project [2016060101010074]
- Shenzhen Basic Research Plan Project [JCYJ20150508152951667]
- Hubei Biomass-Resource Chemistry and Environmental Biotechnology Key Laboratory (Wuhan University) [HBRCEBL2014-2015002]
- Large-scale Instrument and Equipment Sharing Foundation of Wuhan University
Electro-assisted iron-mediated persulfate (PS) activation process has been successfully employed to oxidize organic contaminant. However, a majority of iron-based catalysts used for PS activation was synthesized through complicated or demanding procedures and may have potential risks on environment during the preparation process. Herein, natural maghemite (NM) which is abundant on the earth was employed to activate peroxydisulfate (PDS) in an electrolytic cell. The voltage was provided by microbial fuel cell (MFC) instead of external power as reported in the previous studies, so as to establish a self-driven electro/natural maghemite/PDS system (MFC/NM/PDS) for the oxidation of acid orange 7 (A07). The results showed that above 90% removal efficiency of A07 was achieved in a wide range of pH (3.0-9.0) after 100 min reaction. Singlet oxygen was identified for the first time during PDS activation and surface bound sulfate radicals served as the dominant active species responsible for A07 oxidation. The underlying mechanism of A07 elimination in the MFC/NM/PDS system was elucidated through quenching tests, electron paramagnetic resonance (EPR) and X-ray photoelectron spectroscopy (XPS) techniques. The variation of TOC and cytotoxicity to Escherichia coli was explored. The intermediate products formed were identified using LC-TOF-MS technique and a possible pathway of A07 degradation was proposed. (C) 2017 Elsevier B.V. All rights reserved.
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