摘要：

以钛片为基底,SnO₂+Sb₂O₅为中间层,自制氧化铅电极用于苯酚的电化学降解。试验结果表明,自制电极具有良好的苯酚去除效果:在室温为15℃,电极间距为15 mm,电流密度为16 mA/cm²,苯酚溶液pH为6.3,导电介质Na₂SO₄浓度为0.25 mol/L时,电解300 mL初始质量浓度为100 mg/L的苯酚,4 h后去除率可达91.89%。研究降解过程中苯酚初始浓度、pH、导电介质、电流密度、电极间距等因素对苯酚降解过程的影响。在此基础上对苯酚降解影响较大的初始浓度、pH、电流密度3个因素优化,通过响应曲面分析交互影响和单因素影响,结果表明,三者交互影响不大,苯酚初始浓度影响最大,pH影响最小,与单因素影响分析结果吻合。

关键词: 自制氧化铅电极, 苯酚, 电化学降解, 响应曲面法

Abstract:

Using titanium plate as substrate,and SnO₂+Sb₂O₅ as an intermediary,the lead oxide electrode for electro-chemical degradation of phenol is made.The experimental results show that the homemade electrode has very good phenol removing effect.When the room temperature is 15℃,electrode spacing 15 mm,current density 16 mA/cm²,pH 6.3,and conductive medium Na₂SO₄ concentration 0.25 mol/L,300 mL of phenol,whose initial mass concentra-tion is 100 mg/L,is electrolyzed for 4 h,the removing rate can reach 91.89%.The influences of the factors,such as initial concentration of phenol,pH,conductive medium,current density,electrode spacing,etc.on the phenol degra-dation process are studied.On the basis of these results,the three factors that have more influences on phenol degra-dation,including initial concentration,pH and current density,are optimized,by response surface method,interac-tive influence and single-factor influence.The results show that the interactive influences of the three are not obvi-ous.The initial concentration of phenol has the largest influence,and pH has the least influence.It is in line with the analytical result of single factor influence.

Key words: homemade lead oxide electrode, phenol, electrochemical degradation, response surface method

中图分类号: 

• X703.1