期刊
CHEMOSPHERE
卷 188, 期 -, 页码 139-147出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2017.08.137
关键词
Electrochemical; Granulated activated carbon; Peroxymonosulfate; Acid Orange 7; Reactive radical
资金
- Natural Science Foundation of China [21547006]
- Wuhan Applied Basic Research Project [2016060101010074]
- Natural Science Foundation of Hubei Province [2016CFB112]
- Postdoctoral Science Foundation of China [2016M602365]
- Shenzhen Basic Research Plan Project [JCYJ20150508152951667]
- Large-scale Instrument and Equipment Sharing Foundation of Wuhan University
Electrochemistry coupled with granulated activated carbon catalysis of peroxymonosulfate (electro/GAC/PMS) as a novel wastewater treatment process was performed for the degradation of Acid Orange 7 (AO7) in aqueous solution. The decolorization of AO7 was compared under different permutations and combinations of electro-oxidation, GAC and PMS. It showed that the electro/GAC/PMS process was the most effective and the decolorization of AO7 followed pseudo-first order kinetics. The surface chemistry of GAC samples was analyzed by Fourier transform infrared spectroscopy and XLray photoelectron spectroscopy. Compared with the fresh samples, pi-electron density and hydroxyl group content decreased under the GAC/PMS system, but kept the similar values under the electro/GAC/PMS system. Electron paramagnetic resonance and radical scavenger studies were used to verify the formation of sulfate radicals (SO4 center dot-) and hydroxyl radicals (center dot OH). The optimized conditions were found to be: current density 8 mA cm(-2); PMS concentration 5 mM; GAC dosage 0.5 g L-1; and initial pH value 5.0. GAC recycling experiments over 4 runs showed some decrease in reactivity. Overall, the results indicate that 100% color removal was readily achieved and 50.4% of TOC was removed which shows high efficiency of the electro/GAC/PMS process. (C) 2017 Elsevier Ltd. All rights reserved.
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