Cost-effective electro-Fenton using modified graphite felt that dramatically enhanced on H2O2 electro-generation without external aeration. (1st May 2015)

• Record Type: Journal Article
• Authors: Yu, Fangke; Zhou, Minghua; Yu, Xinmin
• Is Part Of: Electrochimica acta. Volume 163(2015)
• Page Start: 182
• Page End: 189
• Publication Date: 2015-05-01
• Subjects: Graphite felts modification -- Electro-Fenton -- Hydrogen peroxide -- Current efficiency; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2015.02.166
• Languages: English
• ISSNs: 0013-4686

Abstract

Highlights: A simple method using carbon black and PTFE was firstly developed to modify graphite felt. The production of H2 O2 increased 10.7 times at carbon black to PTFE mass ratio of 1:5. After modification the cathode showed a more stable performance over a wider pH and O2 flow rate. It accomplished a cost-effective H2 O2 production without external aeration. The complete removal of methyl orange by electro-Fenton with modified cathode was more efficient. Abstract: A simple method using carbon black and polytetrafluoroethylene (PTFE) was firstly developed to modify graphite felt which was widely employed as cathode for electro-Fenton, improving the in situ production of H2 O2 by about 10.7 times at the optimum carbon black to PTFE mass ratio of 1:5. It was observed that after cathode modification the effect of operating parameters on H2 O2 electro-generation, such as O2 flow rate, current density and initial pH, were absolutely different with that before modification, demonstrating a more stable performance over a wider pH and oxygen flow rate ranges. The maximum accumulation of H2 O2, up to 472.9 mg/L, was obtained at 50 A/m 2 without aeration at initial pH 7, and the H2 O2 production capacity remained over 90% after 10-times reuses. The complete removal of 50 mg/L methyl orange by electro-Fenton on the modified cathode was achieved within 15 min, while the total organic carbon removal efficiency reached 95.7% at 2 h, which was more than four-times that on the unmodified one (23.3%). Such a cathode modification accomplishes an efficient and greatly enhanced H2 O2 production without external aeration, offering a cost-effective degradation of organic pollutants by electro-Fenton.