超声掺Bi二氧化铅电极电氧化降解2-氯苯酚研究  

Electro-catalytic Oxidation of 2-chlorophenol on a Ultrasonic Doped Bi-PbO_2/Ti in Aqueous Solution

作　　者：李晓乐[1] 马科友[1] 苏小莉[1] 张晓杰[1,2] 张琳[1] 

机构地区：[1]济源职业技术学院冶金化工系,河南济源459000 [2]中国科学院兰州化学物理研究所,兰州730000

出　　处：《表面技术》2016年第2期151-155,共5页Surface Technology

摘　　要：目的提高Pb O_2/Ti的使用寿命、对目标反应物的电氧化催化活性及选择性。方法以覆有Sn O_2+Sb_2O_3的Ti网为阳极,分别在Pb(NO_3)_2、Na F混合溶液及Pb(NO_3)_2、Na F、Bi(NO_3)_3组成的掺Bi混合溶液中,在电沉积液p H=2、60℃、电沉积电流密度为0.04 A/cm^2的条件下,进行常规电沉积及超声电沉积1 h,制备出Pb O_2/Sn O_2+Sb_2O_3/Ti,Bi-Pb O_2/Sn O_2+Sb_2O_3/Ti,Pb O_2(ultrasonic)/Sn O_2+Sb_2O_3/Ti,Bi-Pb O_2(ultrasonic)/Sn O_2+Sb_2O_3/Ti 4类二氧化铅电极。在硫酸溶液中测定其加速寿命,用稳态极化曲线分析电催化性及选择性,以2-氯苯酚的电氧化降解反应为模型反应,考察电解2-氯苯酚废水的处理效果,用X射线衍射仪和电子扫描电镜表征沉积层晶相和形貌。结果 Bi-Pb O_2(ultrasonic)/Sn O_2+Sb_2O_3/Ti的加速寿命比Pb O_2/Sn O_2+Sb_2O_3/Ti提高了54%。电氧化降解2-氯苯酚溶液4 h后,以掺Bi二氧化铅电极为阳极,相比于二氧化铅电极,对2-氯苯酚的脱除率提高了19%,槽压降低了7%,稳态极化曲线和电氧化降解2-氯苯酚溶液试验反映了相同的结论。结论超声波环境和Bi掺杂显著提升电极的性能,掺Bi的二氧化铅沉积层表现出较高的电催化性和电氧化2-氯苯酚的选择性,超声电沉积二氧化铅能增大电极比表面积,提高电极的表观催化活性和电极加速寿命。Objective To improve the service life,electrocatalytic activity,electrocatalytic selectivity of the Ti-base lead dioxide electrode for the target pollutant of 2-chlorophenol. Methods In this paper,four different types of Ti-base lead dioxide eletrodes including Pb O_2/ Sn O_2＋ Sb_2O_3/ Ti,Bi-Pb O_2/ Sn O_2＋ Sb_2O_3/ Ti,Pb O_2（ ultrasonic） /Sn O_2＋ Sb_2O_3/ Ti and Bi-Pb O_2（ ultrasonic） /Sn O_2＋ Sb_2O_3/ Ti were prepared by electro-deposition and ultrasonic-associated electro-deposition using Ti web with an Sn O_2＋Sb_2O_3layer obtained by spreading and oxidating polymeric precursor as anodes. The composition of the electrolyte and operating conditions were as follows. The mixed solution of Na F and Pb（ NO_3）_2or the mixed solution of Na F,Pb（ NO_3）_2and Bi（ NO_3）_3was used. The p H of the mixed solution was 2,the coating current density was 0. 04 A/cm^2,the temperature of coating solution was 60℃,and the time of electro-deposition was 1 hour. The accelerated service life was determined in sulfuric acid solution. Their electric catalysis and electro catalytic selectivity were analyzed by static anodic polarization curves,the effect of electrolysing 2-chlorphenol solution was tested using the electro-oxidative degradation of 2-chlorophenol as the model response,the morphology and crystal phase of surface coating was characterized by scanning electron microscopy and X-ray diffraction. Results The accelerated life of Bi-Pb O_2（ ultrasonic） /Sn O_2＋ Sb_2O_3/ Ti increased by 54% than Pb O_2/ Sn O_2＋ Sb_2O_3/ Ti. Compared to Pb O_2/ Sn O_2＋ Sb_2O_3/Ti,the 2-chlorophenol removal rate had a 19% increase after 4 hours of electrolysis using Bi-Pb O_2（ ultrasonic） /Sn O_2＋ Sb_2O_3/ Ti as an anode,and the electrolyzer voltage had a 7% reduction. The static anodic polarization curves and the electro-oxidative degradation test of 2-chlorophenol solution showed the same results. Conclusion Ultrasonic environment in the process of preparation of electrode and doped Bi have a benefici

关 键 词：超声电沉积 二氧化铅电极 BI 2-氯苯酚 降解 电催化 

分 类 号：TQ153.3[化学工程—电化学工业] O646[理学—物理化学]