期刊
ELECTROCHIMICA ACTA
卷 245, 期 -, 页码 193-202出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2017.05.067
关键词
Cathode; Peroxymonosulfate; Phenol; Sulfate radical; Wastewater treatment
资金
- Nature Science Foundation of China [51008139, 51378232]
- Fundamental Research Funds for the Central Universities (Huazhong University of Science and Technology) [2015QN122]
- Wuhan Youth Chenguang Program of Science and Technology [2014070404010202]
A novel Cathode/peroxymonosulfate(PMS)/Fe3+ system is developed and its performance is evaluated by phenol degradation. The factors affecting phenol degradation such as current density, PMS dosage, Fe3+ dosage, electrolyte concentration and initial phenol concentration were investigated. Compared with the non-separated system (EC/PMS/Fe3+), the separated Cathode/PMS/Fe3+ system can prevent the current loss due to anodic oxidation of Fe2+. A synergistic effect is observed in Cathode/PMS/Fe3+ system due to the cathodic regeneration of Fe2+ from Fe3+. The regeneration of Fe2+ on cathode surface can be improved by increasing of current density, PMS dosage, Fe3+ dosage and initial phenol concentration, and results in an improvement on the organics removal, while PMS consumption rate mainly depends on current density in the Cathode/PMS/Fe3+ system. Increasing of SO42 concentration has a negative effect on phenol degradation since the reactivity of SO4 center dot is depressed. Both SO4 center dot and (OH)-O-center dot exist and play roles in the Cathode/PMS/Fe3+ system, while SO4 center dot is found to be the predominant radical species. (C) 2017 Elsevier Ltd. All rights reserved.
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