Nitrogen-doped diamond electrode shows high performance for electrochemical reduction of nitrobenzene

Journal of Hazardous Materials
Qing ZhangHongtao Yu

Abstract

Effective electrode materials are critical to electrochemical reduction, which is a promising method to pre-treat anti-oxidative and bio-refractory wastewater. Herein, nitrogen-doped diamond (NDD) electrodes that possess superior electrocatalytic properties for reduction were fabricated by microwave-plasma-enhanced chemical vapor deposition technology. Nitrobenzene (NB) was chosen as the probe compound to investigate the material's electro-reduction activity. The effects of potential, electrolyte concentration and pH on NB reduction and aniline (AN) formation efficiencies were studied. NDD exhibited high electrocatalytic activity and selectivity for reduction of NB to AN. The NB removal efficiency and AN formation efficiency were 96.5% and 88.4% under optimal conditions, respectively; these values were 1.13 and 3.38 times higher than those of graphite electrodes. Coulombic efficiencies for NB removal and AN formation were 27.7% and 26.1%, respectively; these values were 4.70 and 16.6 times higher than those of graphite electrodes under identical conditions. LC-MS analysis revealed that the dominant reduction pathway on the NDD electrode was NB to phenylhydroxylamine (PHA) to AN.

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Citations

Dec 31, 2015·Journal of Hazardous Materials·Li-Zhi HuangMorten Jannik Bjerrum
Oct 30, 2018·Chemical Society Reviews·Yangming LinSiglinda Perathoner
Jan 25, 2019·Physical Chemistry Chemical Physics : PCCP·Swapna ChallagullaSounak Roy
Sep 9, 2019·Environmental Science and Pollution Research International·Yunting WangChunhui Zhang
Nov 18, 2018·Chemical Society Reviews·Nianjun YangXin Jiang
Dec 27, 2016·Royal Society Open Science·Ataf Ali AltafAmin Badshah

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