苯酚在金刚石膜电极上的电化学氧化降解过程

 采用循环伏安法、交流阻抗法、恒电位计时电流法,并结合高效液相色谱方法,研究了苯酚在金刚石膜电极上的电化学氧化降解过程.结果表明,苯酚在电化学氧化降解中经历了苯二酚、苯醌的形成和进一步被氧化的过程,苯二酚在反应过程中的积累很少,迅速氧化为苯醌,而醌类中间产物则较难进一步氧化,在反应过程中积累的浓度较高.苯酚在金刚石膜电极上有不同的电化学氧化反应途径,在低于金刚石膜电极析氧电位下,发生单纯直接电化学氧化过程;在高于金刚石膜电极析氧电位下,间接电化学氧化和直接电化学氧化将同时发生作用.

The electrochemical oxidation degradation process of phenol on diamond membrane electrode

The electrochemical oxidation degradation process of phenol on diamond membrane electrode was studied in detail adopting the techniques of cyclic voltammetry, AC Impedance and Amperometric i~t Curve, combined with efficient liquid chromatographic technique. In electrochemical oxidation degradation, phenol underwent the generation of benzodiphenol and benzoquinone, and further oxidation process. In the reaction process, benzodiphenol oxidized rapidly to benzoquinone with very little accumulation; while the benzoquinone intermediates were further-oxidized more hardly, and the concentration of accumulation was higher. Phenol had different ways of electrochemical oxidation reaction; under the oxygen evolution potential of the diamond membrane electrode, the direct electrochemical oxidation occurred. While above the oxygen evolution potential, indirect electrochemical oxidation and direct electrochemical oxidation took place together.