羟自由基在电极电解过程中的形成规律

对钛基二氧化铅电极电解过程中产生的^·OH进行了定量研究.结果表明,钛基二氧化铅电极在适当的电解条件下可以产生大量的自由基,碱性和高频条件下产生的自由基比酸性和低频条件下产生的自由基多.苯酚降解实验结果说明了其极强的氧化性能,在废水的深度处理方面有着极其广阔的应用前景.

Forming Law of Hydroxyl Radical During Electrolysis Process

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.