摘要
制备了碳、聚四氟乙烯质量比为4:1的C/PTFE气体扩散电极,并将其作为阴极与Ti/RuO2阳极构成电解槽,在阴阳极之间放置纯棉隔膜,在0 1mol/LNa2SO4溶液中电解20分钟,阴极室HO2-浓度为56mg/L.将隔膜电解槽应用于苯酚的电催化氧化,研究了阴、阳极协同作用电催化氧化降解水中苯酚的效果.实验结果表明,在电解反应初期,苯酚去除效率及COD和TOC的去除率随着电解时间的增加而增大,电解80分钟后,三者的变化趋势减缓,电解100分钟后,阴极室、阳极室苯酚的去除率分别为92%、97%;阴、阳极室COD去除率分别达到86%、70%;TOC去除率分别达到84%、68%.阴极室内,氧在阴极还原生成的碱性过氧化氢(HO2-)导致苯酚的矿化效果优于阳极的氧化作用.
C/PTFE gas diffusion electrode was prepared with the optimum rate of 4:1 for carbon powder and PTFE. C/PTFE cathode and Ti/RuO_2 anode were used to construct an electrolyte cell with a cotton membrane between the cathode and the anode. HO_2^-of 56mg/L was determined in the cathodic compartment in 0.1mol/L Na_2SO_4 for 20min electrolysis. Synergetic effects of anodic-cathodic electro-catalytic oxidation for phenol degradation were studied in this two compartments cell. The variations of concentration of phenol, COD and TOC were measured. The results indicated that phenol removal efficiency got to 92% and 97% at 100 min in the cathodic compartment and the anodic compartment respectively. COD and TOC removal efficiencies were 86%, 84% and 70%, 68% at 100 min in the cathodic chamber and the anodic chamber respectively. The UV scanning spectrum gave the change of diagnostic absorption of phenolatλ =2 1 3nm .Phenoldegradationinthe cathodic compartment wasdue to electro generated oxidizing agentHO2 - which can oxidize more phenol molecules into CO2 and H2 Ocompared with the anodic oxidation .
出处
《材料科学与工艺》
EI
CAS
CSCD
2004年第3期303-306,共4页
Materials Science and Technology
