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Ultrahigh yield of hydrogen peroxide and effective diclofenac degradation on graphite felt cathode loading with CNT and carbon black: electro-generation mechanism and degradation pathway

Abstract

A new graphite felt cathode loading with carbon nanotube (CNT) was developed, presenting a very high H2O2 generation rate of 10.73 mg h-1 cm-2 with relatively low electric energy consumption (6.90 kWh kg-1), improving the in situ production of H2O2 by about 20 times at the optimum CNT to carbon black mass ratio of 3:2. Important cathode manufacture parameters including the ratio and loading of CNT were optimized, and the influence factors of H2O2 electro-generation with pH and current density were investigated. In order to study the possible mechanism for H2O2 electro-generation, further exploration of the cathode was found to accelerate oxygen reduction reaction (ORR) activity and enhanced electrochemical behavior during H2O2 production. The removal rate of diclofenac by electro-Fenton (EF) on the CNT loaded cathode was over 99% within 30 min, while the total organic carbon (TOC) removal of diclofenac reached 91.71% respectively at 180 min, which was more than 4 times that on the unloaded one (19.05%). Based on the analysis by LC-MS, a possible mechanism and degradation pathway for diclofenac were proposed. And the CNT loaded electrode was very stable, it still removed 87.4 % of the TOC after ten runs. Such a CNT loaded cathode accomplished an efficient and significant enhanced H2O2 production, offering an efficient and low energy consumption degradation of organic pollutants by EF.

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Publication details

The article was received on 12 Dec 2017, accepted on 05 Feb 2018 and first published on 06 Feb 2018


Article type: Paper
DOI: 10.1039/C7NJ04925K
Citation: New J. Chem., 2018, Accepted Manuscript
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    Ultrahigh yield of hydrogen peroxide and effective diclofenac degradation on graphite felt cathode loading with CNT and carbon black: electro-generation mechanism and degradation pathway

    F. yu, C. yang and H. ma, New J. Chem., 2018, Accepted Manuscript , DOI: 10.1039/C7NJ04925K

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