Effect of applied voltage, initial concentration, and natural organic matter on sequential reduction/oxidation of nitrobenzene by graphite electrodes.

Environmental Science & Technology
Mei SunKelvin B Gregory

Abstract

Carbon electrodes are proposed in reactive sediment caps for in situ treatment of contaminants. The electrodes produce reducing conditions and H(2) at the cathode and oxidizing conditions and O(2) at the anode. Emplaced perpendicular to seepage flow, the electrodes provide the opportunity for sequential reduction and oxidation of contaminants. The objectives of this study are to demonstrate degradation of nitrobenzene (NB) as a probe compound for sequential electrochemical reduction and oxidation, and to determine the effect of applied voltage, initial concentration, and natural organic matter on the degradation rate. In H-cell reactors with graphite electrodes and buffer solution, NB was reduced stoichiometrically to aniline (AN) at the cathode with nitrosobenzene (NSB) as the intermediate. AN was then removed at the anode, faster than the reduction step. No common AN oxidation intermediate was detected in the system. Both the first order reduction rate constants of NB (k(NB)) and NSB (k(NSB)) increased with applied voltage between 2 V and 3.5 V (when the initial NB concentration was 100 μM, k(NB) = 0.3 h(-1) and k(NSB) = 0.04 h(-1) at 2 V; k(NB) = 1.6 h(-1) and k(NSB) = 0.64 h(-1) at 3.5 V) but stopped increasing beyond the t...Continue Reading

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Citations

Jun 4, 2013·Water Research·Mei SunKelvin B Gregory
Apr 24, 2013·Environmental Science & Technology·Bin LiangDuu-Jong Lee
Nov 23, 2013·Environmental Science & Technology·Jelena RadjenovicJurg Keller
Dec 31, 2015·Journal of Hazardous Materials·Li-Zhi HuangMorten Jannik Bjerrum
Oct 11, 2015·Journal of Hazardous Materials·Chenju LiangJia-Wei Shiu
May 6, 2014·Bioresource Technology·S Venkata MohanM Lenin Babu
Dec 14, 2016·Journal of Water and Health·Hugo Alejandro Nájera-AguilarMaría Neftalí Rojas-Valencia
Jun 13, 2020·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Lorianne R ShultzTitel Jurca
Dec 29, 2019·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Lorianne R ShultzTitel Jurca
Jun 18, 2014·Environmental Science & Technology·Lin ShiZhen-Hu Hu
Jan 21, 2015·Environmental Science & Technology·Guandao GaoChad D Vecitis

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