Forming Law of Hydroxyl Radical During Electrolysis Process

Abstract

Abstract:

Hydroxyl radical is the main species of many free radical oxidation reactions. The strong oxidation ability of hydroxyl radical can be used to oxidize organic substances and other impurities in water, decreasing the Chemical Oxygen Demand (COD) value and reaching the goal of water treatment. Aromatic hydroxylation from the reaction between hydroxyl radical and salicylate or its related compounds has been often utilized as a marker for the generation of hydroxyl radicals. We have investigated several technical aspects of applying this method to study hydroxyl radical production during the electrolysis process using the salicylic acid(2-HBA) to form 2,5-dihydroxybenzoic acid(2,5-DHBA). Aqueous solution of 2-HBA was electrolyzed by Ti-base lead dioxide electrode, then the solution containing 2-HBA and 2,5-DHBA was analyzed by High Performance Liquid Chromatography(HPLC) with fluorescence detection. The results show that high pH value is better than low pH value, also high frequency is better than low frequency.

Key words: Hydroxyl radical; 2,5-DHBA; HPLC; Lead dioxide electrode, Hydroxyl radical, 2,5-DHBA, HPLC, Lead dioxide electrode

CLC Number:

X312

TrendMD:

LIU Miao, DIAO Wei-Li, WU Di, JIAO Xin-Qian, LI Yan-Li, QUAN Fu-Min. Forming Law of Hydroxyl Radical During Electrolysis Process[J]. Chem. J. Chinese Universities, 2005, 26(12): 2223.

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Forming Law of Hydroxyl Radical During Electrolysis Process

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