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Effects of some factors during electrochemical degradation of phenol by hydroxyl radicals
Authors:Di Wu  Miao Liu  Deming Dong  Xiling Zhou
Institution:aCollege of Environment and Resources, Jilin University, Changchun, 130012, PR China;bHigh School Attached to Northeast Normal University, Changchun, 130021, PR China
Abstract:Hydroxylation of aromatic compounds has been used extensively as a measure of hydroxyl radicals (radical dotOH) formation. In this paper, salicylic acid (2-HBA) was used to trap radical dotOH in the process of electrolysis with a couple of Ti-base lead dioxide electrodes in different conditions. Aqueous solution of 2-HBA, a couple of Ti-base lead dioxide electrodes and an AC power were used in the course of radical dotOH formation, and then the solution containing 2-HBA and 2,5-dihydroxybenzoic acid (2,5-DHBA) was analyzed by High Performance Liquid Chromatography (HPLC) with fluorescence detector. This method can help us to better understand the reaction mechanism of radical dotOH from the viewpoint of quantity.In the same conditions of electrolysis, Total Organic Carbon (TOC) of phenol solutions were detected to identify the effects of some factors during this electrochemical process, because the strong oxidation ability of radical dotOH can mineralize the organic pollutants totally and finally achieve the goal of water treatment. The results show that high pH value of electrolyte and high frequency of the AC power are favorable for the generation of radical dotOH, however, CO32− is opposite to them.
Keywords:High Performance Liquid Chromatography  Hydroxyl radicals  Lead dioxide electrode  Phenol
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