期刊
ELECTROCHIMICA ACTA
卷 200, 期 -, 页码 222-230出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2016.03.181
关键词
flow-through electro-Fenton; organic pollutant degradation; graphite felt modification; electric energy consumption
资金
- Natural Science Foundation of China [21273120, 51178225]
- National High Technology Research and Development Program of China [2013AA065901, 2013AA06A205]
- China National Water Project [2015ZX07203-11]
- Fundamental Research Funds for the Central Universities
- National Innovative Training Program of College Students [201510055108]
A highly energy-efficient flow-through Electro-Fenton (E-Fenton) reactor for oxidation of methylene blue (MB) from aqueous solution was designed using a perforated DSA as anode and the graphite felt modified by carbon black and polytetrafluoroethylene (PTFE) as cathode for the in situ generation of H2O2. The modified cathode had a high H2O2 production with low energy consumption, which was characterized by scanning electron microscopy (SEM), nitrogen adsorption-desorption study and contact angle. The flow-through E-Fenton system was compared to the flow-by and regular one, and confirmed to be best on MB removal and TOC degradation. The operational parameters such as current density, pH, Fe2+ concentration and flow rate were optimized. The MB and TOC removal efficiency of the effluents could keep above 90% and 50%, respectively, and the energy consumption was 23.0 kWh/kgTOC at the current density of 50 mA, pH 3, 0.3 mM Fe2+, and the flow rate of 7 mL/min. center dot OH was proved to be the main oxidizing species in this system. After 5 times operation, the system, especially cathode, still showed good stability. Five more organic pollutants including orange II (OG), tartrazine, acetylsalicylic acid (ASA), tetracycline (TC) and 2,4-dichlorophen (2,4-DCP) were investigated and the electric energy consumption (EEC) was compared with literatures. All results demonstrated that this flow-through E-Fenton system was energy-efficient and potential for degradation of organic pollutants. (C) 2016 Elsevier Ltd. All rights reserved.
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