阴阳极同时作用电化学氧化降解苯酚的研究
首发时间:2011-10-24
摘要:以Ti/IrO2/RuO2电极为阳极、C/PTFE气体扩散电极为阴极,在以涤纶为隔膜的电解槽内研究了阴阳极同时作用电化学催化氧化降解水中苯酚的效果。系统地考察了电流密度(18-46mA/cm2)、电解质浓度(0.01-0.1mol/L)、pH (1.01-12.98)、初始苯酚浓度(100-300mg/L)、极间距(1-3cm)和曝气速度(0-2.53L/min)对苯酚去除率的影响。控制合适的反应条件,苯酚的去除率可达到100%。电解100min后,阴极室COD和TOC去除率分别为91.7%、84%,阳极室COD和TOC去除率分别为70.7%、68%。紫外扫描和GC/MS分析结果表明,在电解过程中阳极室降解产物主要是苯醌,而阴极室降解产物为一些小分子脂肪酸。苯酚的降解是在阳极的直接、间接氧化及阴极产生的H2O2、HO•和O2-•自由基的氧化共同作用下完成的。
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Synergetic Effects of Anodic-Cathodic Electrocatalytic Oxidation for Phenol Degradation
Abstract:Synergetic effects of anodic-cathodic electrocatalysis for phenol degradation were studied using C/PTFE O2-fed cathode and Ti/IrO2/RuO2 anode in a two-compartment cell. The influence of the current density (18-46mA/cm2), the concentration of supporting electrolyte (0.01-0.1mol/L), pH (1.01-12.98), initial phenol concentration (100-300mg/L), the distance between the electrodes (1-3cm) and the rate of sparged-air (0-2.53L/min) on the degradation was investigated. If the condition of electrochemical reaction was controlled properly, the average phenol removal efficiency was 100% by using anodic-cathodic electrocatalysis process. The removal efficiencies of chemical oxygen demand (COD) and total organic carbon (TOC) in cathodic compartment were 91.74% and 84% in cathodic compartment, 70.65% and 68% in the anodic compartment. According to UV scanning spectrum and gas chromatography-mass spectroscopy (GC-MS) analysis, benzoquinone produced from phenol oxidation was identified in anodic compartment and smaller molecule formic acid was determined in cathodic solution. The degradation reaction of phenol is supposed to be cooperative oxidized by direct or indirect electrochemical oxidation at the anode and H2O2, HO•, O2-•produced by oxygen reduction at the cathode.
Keywords: Environmental Engineering electrocatalytic oxidation synergetic effects of anode-cathode phenol
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