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Reaction pathways and mechanisms of the electrochemical degradation of phenol on different electrodes.
Water Res. 2005 May; 39(10):1972-81.WR

Abstract

Laboratory experiments were carried out on the kinetics and pathways of the electrochemical (EC) degradation of phenol at three different types of anodes, Ti/SnO2-Sb, Ti/RuO2, and Pt. Although phenol was oxidised by all of the anodes at a current density of 20 mA/cm2 or a cell voltage of 4.6 V, there was a considerable difference between the three anode types in the effectiveness and performance of EC organic degradation. Phenol was readily mineralized at the Ti/SnO2-Sb anode, but its degradation was much slower at the Ti/RuO2 and Pt anodes. The analytical results of high-performance liquid chromatography (HPLC) and gas chromatography coupled with mass spectrometry (GC/MS) indicated that the intermediate products of EC phenol degradation, including benzoquinone and organic acids, were subsequently oxidised rapidly by the Ti/SnO2-Sb anode, but accumulated in the cells of Ti/RuO2 and Pt. There was also a formation of dark-coloured polymeric compounds and precipitates in the solutions electrolyzed by the Ti/RuO2 and Pt anodes, which was not observed for the Ti/SnO2-Sb cells. It is argued that anodic property not only affects the reaction kinetics of various steps of EC organic oxidation, but also alters the pathway of phenol electrolysis. Favourable surface treatment, such as the SnO2-Sb coating, provides the anode with an apparent catalytic function for rapid organic oxidation that is probably brought about by hydroxyl radicals generated from anodic water electrolysis.

Authors+Show Affiliations

Environmental Engineering Research Centre, Department of Civil Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong, China. xlia@hkucc.hku.hkNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

15882890

Citation

Li, Xiao-Yan, et al. "Reaction Pathways and Mechanisms of the Electrochemical Degradation of Phenol On Different Electrodes." Water Research, vol. 39, no. 10, 2005, pp. 1972-81.
Li XY, Cui YH, Feng YJ, et al. Reaction pathways and mechanisms of the electrochemical degradation of phenol on different electrodes. Water Res. 2005;39(10):1972-81.
Li, X. Y., Cui, Y. H., Feng, Y. J., Xie, Z. M., & Gu, J. D. (2005). Reaction pathways and mechanisms of the electrochemical degradation of phenol on different electrodes. Water Research, 39(10), 1972-81.
Li XY, et al. Reaction Pathways and Mechanisms of the Electrochemical Degradation of Phenol On Different Electrodes. Water Res. 2005;39(10):1972-81. PubMed PMID: 15882890.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Reaction pathways and mechanisms of the electrochemical degradation of phenol on different electrodes. AU - Li,Xiao-Yan, AU - Cui,Yu-Hong, AU - Feng,Yu-Jie, AU - Xie,Zhao-Ming, AU - Gu,Ji-Dong, PY - 2004/09/17/received PY - 2005/01/31/revised PY - 2005/02/22/accepted PY - 2005/5/11/pubmed PY - 2005/10/28/medline PY - 2005/5/11/entrez SP - 1972 EP - 81 JF - Water research JO - Water Res. VL - 39 IS - 10 N2 - Laboratory experiments were carried out on the kinetics and pathways of the electrochemical (EC) degradation of phenol at three different types of anodes, Ti/SnO2-Sb, Ti/RuO2, and Pt. Although phenol was oxidised by all of the anodes at a current density of 20 mA/cm2 or a cell voltage of 4.6 V, there was a considerable difference between the three anode types in the effectiveness and performance of EC organic degradation. Phenol was readily mineralized at the Ti/SnO2-Sb anode, but its degradation was much slower at the Ti/RuO2 and Pt anodes. The analytical results of high-performance liquid chromatography (HPLC) and gas chromatography coupled with mass spectrometry (GC/MS) indicated that the intermediate products of EC phenol degradation, including benzoquinone and organic acids, were subsequently oxidised rapidly by the Ti/SnO2-Sb anode, but accumulated in the cells of Ti/RuO2 and Pt. There was also a formation of dark-coloured polymeric compounds and precipitates in the solutions electrolyzed by the Ti/RuO2 and Pt anodes, which was not observed for the Ti/SnO2-Sb cells. It is argued that anodic property not only affects the reaction kinetics of various steps of EC organic oxidation, but also alters the pathway of phenol electrolysis. Favourable surface treatment, such as the SnO2-Sb coating, provides the anode with an apparent catalytic function for rapid organic oxidation that is probably brought about by hydroxyl radicals generated from anodic water electrolysis. SN - 0043-1354 UR - https://www.unboundmedicine.com/medline/citation/15882890/Reaction_pathways_and_mechanisms_of_the_electrochemical_degradation_of_phenol_on_different_electrodes_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0043-1354(05)00112-0 DB - PRIME DP - Unbound Medicine ER -