自制氧化铅电极降解苯酚的试验研究

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。%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.