期刊
BIORESOURCE TECHNOLOGY
卷 224, 期 -, 页码 63-68出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2016.10.069
关键词
Microbial electrolysis cell; Photocatalysis; Azo dye degradation; Hydrogen production; Degradation mechanism
资金
- Guangxi Colleges and Universities Key Laboratory of Environmental Protection [C3050097902]
- National Natural Science Foundation of China [41471181]
- Ability Promotion Project of Education Department of Guangxi Province for Young and Middle-aged Teachers in Universities
The single-chamber microbial electrolysis cell constructed with a TiO2-coated photocathode, termed photocatalytic microbial electrolysis cell (PMEC), was developed to accelerate methyl orange (MO) degradation and concurrent hydrogen (H-2) recovery under UV irradiation. Results showed that faster MO decolorization rates were achieved from the PMEC compared with those without UV irradiation or with open circuit. With increase of MO concentrations (acetate as co-substrate) from 50 to 300 mg/L at an applied voltage of 0.8 V, decolorization efficiencies decreased from 98% to 76% within 12 h, and cyclic H-2 production declined from 113 to 68 mL. As the possible mechanism of MO degradation, bioelectrochemical reduction, co-metabolism reduction, and photocatalysis were involved; and degradation intermediates (mainly sulfanilic acid and N,N-dimethylaniline) were further degraded by (OH)-O-center dot generated from photocatalysis. This makes MO mineralization be possible in the single-chamber PMEC. Hence, the PMEC is a promising system for dyeing wastewater treatment and simultaneous H-2 production. (C) 2016 Elsevier Ltd. All rights reserved.
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