以泡沫镍为阴极的电芬顿法对苯酚的降解

电芬顿是一种高级氧化技术,其中电极材料对其处理效果有较为明显的影响.为提高电芬顿系统处理效率,选用泡沫镍电极作为阴极,以H2O2浓度为指标,探究了操作条件(pH、电流密度、曝气速率、电极间距)对其催化产H2O2性能的影响,并利用苯酚作为模拟污染物研究降解效果.实验结果表明,泡沫镍具备优异的阴极性能,其最佳工作条件为:pH=3,电流密度i=3 mA/cm2,曝气量10 L/h,电极间距3 cm,在此条件下反应60 min后H2O2浓度可达45 mg/L.使用泡沫镍作为阴极降解苯酚废水,研究了Fe2+投加量对去除率的影响.在最佳Fe2+量(40 mg/L)下,反应2 h后苯酚及COD去除率分别达到95%和80%.其降解反应符合准一级动力学方程,表观反应速率常数最大可达5.0×10-4 s-1.

Electro-Fenton degradation of phenol using foam nickel as cathode

Electro-Fenton is one of the advanced oxidation processes (AOPs), of which electrode material has a significant influence on the performance. To improve the efficiency of electro-Fenton, foam nickel was screened as cathode and electro-generated H2O2 was used to investigate the effects of operation parameters (pH, current density, air flow rate and distance between electrodes) on the catalytic performance. Results reveal that foam nickel is an excellent cathode material. The concentration of H2O2 could reach up to 45 mg/L within 60 min under optimal conditions (pH=3, current density=3 mA/cm2, air flow rate=10 L/h, 3 cm between electrodes). Meanwhile, the effect of Fe2+ dosage on phenol removal efficiency was studied. The removal rates of phenol and COD were 95% and 80%, respectively, with Fe2+ dosage of 40 mg/L and electrolysis of 120 min. The degradation of phenol followed pseudo first order kinetics, and the maximum of apparent rate constant was determined as 5.0×10-4 s-1.