电催化氧化阳极制备及其降酚特性
PREPARATION OF DIMENSIONLESS STABLE ANODE IN THE ELECTRO-CATALYTIC OXIDATION AND ITS PHENOL- DEGRADING CHARACTERISTICS
-
摘要: 以自制Ti基SnO2/Sb2O3/IrO2镀层形稳电极(Dimensionless Stable Anode)为阳极,采用电催化氧化法处理模拟含酚废水.通过涂层分析和电化学性能测试表征了自制电极特性,考察了电解质类型和浓度、电流密度、苯酚初始浓度及体系初始pH值等因素对苯酚氧化过程的影响,并探讨其降解动力学规律.结果表明,自制电极是以SnO2为基础的纳米级固熔体氧化物电极且具有较好的表面结构,运行稳定性较好.苯酚的降解主要依赖于以NaCl为电解质时产生的氯系活性物质的间接氧化作用.随着电解质浓度及电流密度的增加,苯酚降解速率随之增大;而苯酚的初始浓度越大,降解速率越慢.体系初始pH对过程影响不明显.苯酚的降解过程符合一级反应动力学.Abstract: Using a home-made dimensionless stable anode(DSA) with Ti-base and SnO2/Sb2O3/IrO2-coating, electro-catalytic oxidation was applied to treat phenol wastewater. Through coatings analysis and electrochemical property test, the characteristics of DSA were investigated. And the effects on the phenol oxidation process of such factors as the type and concentration of electrolyte, current density, initial phenol concentration and initial pH, were studied to explore its degradation kinetics law. The results showed that the home-made electrode was a nano-scale SnO2-based solid-melt-oxide with a productive surface structure and high stability. The degradation of phenol mainly depended on the indirect oxidation of chlorine reactive substances produced with sodium chloride as the electrolyte. Degradation rate of phenol improved with the increasing electrolyte concentration and current density, while it decreased with higher initial phenol concentration. And the initial pHof the system had no obvious effect on the process. Phenol degradation process fitted first-order reaction.
-
Key words:
- electrocatalytic oxidation /
- phenol /
- dimensionless stable anode /
- active chlorine /
- kinetics
-
-
[1] 吴越,催化化学[M]. 北京:科学出版社,2000:1293-1295 [2] Polcaro A M,Palmas S,Renoldi F, et al.On the performance of Ti/SnO2 and Ti/PbO2 anodes in electrochemical degradation of 2-chlorophenol for wastewater treatment[J]. J Appl Electrochem,1999,29:147-151 [3] Rodgers J D,Jedral W J,Bunce N J. Electrochemical oxidation of chlorinated phenols[J]. Environ Sci Technol,1999,33:1453-1457 [4] Correa-Lozano B,Comninellis C,De Battisti A. Service life of Ti/SnO2-Sb2O5 anodes[J]. J Appl Eletrochem,1997,27:970-974 [5] Wang Y Q,Gu B,Xu W L. Electro-catalytic degradation of phenol on several metal-oxide anodes[J]. J Hazard Mater,2008,162(2/3) :1159-1164 [6] Li X Y,Cui Y H,Feng Y J, et al.Reaction pathways and mechanisms of the electrochemical degradation of phenol on different electrodes[J]. Water Research,2005,39:1972-1981 [7] 时文中,褚意新,朱国才. 阳极电化学氧化降解水体中酚的研究[J]. 水处理技术,2005,31(6) :32-34 [8] 梁镇海,张福元,樊彩梅,等.钛基二氧化锡电极的制备及性能研究[J]. 稀有金属材料与工程,2007,36(2) :278-281 [9] 刘文武,涂学炎,王伟,等.两种DSA电极的制备及其对有机废水降解的电催化性能[J]. 环境化学,2007,26(2) :152-156 [10] 秦亮,陶杰,王玲,等.Ti/TiO2-Pt修饰电极的制备及电催化性能研究[J]. 稀有金属材料与工程,2007,36(10) :1870-1873 [11] Hu C,Yu J C,Hao Z, et al.Effects of acidity and inorganic ions on the photocatalytic degradation of different azo dyes[J]. Appl Catal (B: Environ),2003,40:35-47 [12] Rajkumar D,Kim J G,Palanivelu K.Indirect electrochemical oxidation of phenol in the presence of chloride for wastewater treatment[J]. Chem Eng Technol,2005,28:98-105 [13] 杜琳,吴进,李桂英,等.光电催化降解活性艳红K-2BP中电解质NaCl和Na2SO4的作用研究[J]. 化学学报,2006,64(24):2486-2490 [14] Feng Y,Li X.Electrocatalytic oxidation of phenol on several metal-oxide electrodes in aqueous solution[J]. Water Res.,2003,37:2399-2407 [15] 李淼,冯传平,胡伟武,等.Ti/RuO2-Pt电极电化学降解苯酚废水研究[J]. 环境科学技术,2008,31(8):84-89 -
点击查看大图
计量
- 文章访问数: 1067
- HTML全文浏览数: 1034
- PDF下载数: 555
- 施引文献: 0
下载:
