Ti/SnO_2电极在苯酚废水降解中的应用
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摘要
采用热分解法制备了Ti/SnO_2电极,以苯酚为目标污染物,研究苯酚废水在电极上电解的最佳条件、电解一定时间后的电压以及电极的寿命。结果表明,在电流密度为190 A/m2和pH值为2的条件下,苯酚溶液初始质量浓度为70 mg/L,电解350 min后,苯酚和COD的降解效率最高,分别为96.80%和40%,苯酚被降解为中间产物,没有被彻底矿化为CO_2和H_2O,此时的电压为8 V。在25℃,0.5 mol/L的H_2SO_4水溶液中、恒流500 A/m2条件下对电极的寿命测试,电极寿命仅仅为8 h,寿命较短。
Ti/SnO_2 electrode was prepared by thermal decomposition method. With phenol taken as the goal pollutant,the optimum conditions of electrolysis of phenol wastewater on electrode were studied together with the voltage after electrolysis for a certain time and the lifetime of electrode. The results show that the initial mass concentration of phenol solution was 70 mg/L at the current density of 190 A/m2 and pH value of 2. After 350 minutes of electrolysis,the degradation efficiencies of phenol and COD were the highest,96. 80% and 40%,respectively. Phenol was degraded into intermediate product,which was not completely mineralized to CO_2 and H_2O,and the voltage was 8 V. The lifetime of the electrode was measured at 25℃,0. 5 mol/L H_2SO_4 solution and500 A/m~2 constant flow. The electrode life was only 8 hours and the life was short.
Ti/SnO_2 electrode was prepared by thermal decomposition method. With phenol taken as the goal pollutant,the optimum conditions of electrolysis of phenol wastewater on electrode were studied together with the voltage after electrolysis for a certain time and the lifetime of electrode. The results show that the initial mass concentration of phenol solution was 70 mg/L at the current density of 190 A/m2 and pH value of 2. After 350 minutes of electrolysis,the degradation efficiencies of phenol and COD were the highest,96. 80% and 40%,respectively. Phenol was degraded into intermediate product,which was not completely mineralized to CO_2 and H_2O,and the voltage was 8 V. The lifetime of the electrode was measured at 25℃,0. 5 mol/L H_2SO_4 solution and500 A/m~2 constant flow. The electrode life was only 8 hours and the life was short.
引文
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[12]杨丽娟,田玫,崔瑞海,等.苯酚在Ti/Sb2O5-Sn O2/Pb O2电极上的降解[J].功能材料,2007,38(9):3349-3351.(YANG Lijuan,TIAN Mei,CUI Ruihai,et al.The degradation of phenol in Ti/Sb2O5-Sn O2/Pb O2electrode[J].Journal of Functional Materials,2007,38(9):3349-3351.(in Chinese))
[2]朱凌峰,罗琳,蒋宏国,等.Fenton试剂在微波条件下处理稻壳热解发电含酚废水的试验[J].水资源保护,2010,26(3):53-56.(ZHU Lingfeng,LUO Lin,JIANG Hongguo,et al.Experiment on treatment of phenolcontaining water from the generation of electricity of rice hull pyrogenation with Fenton reagent in the condition of microwaves[J].Water Resources Protection,2010,26(3):53-56.(in Chinese))
[3]CHEN X,GAO F,CHEN G.Comparison of Ti/BDD and Ti/Sn O2-Sb2O5electrodes for pollutant oxidation[J].Journal of Applied Electrochemistry,2005,35(2):185-191.
[4]DUVERNEUIL P,MAURY F,PEBERE N,et al.Chemical vapor deposition of Sn O2coatings on Ti plates for the preparation of electrocatalytic anodes[J].Surface&Coatings Technology,2002,151(1):9-13.
[5]李鲜珠,沈玉冰,马溪平,等.苯酚降解菌筛选及降解特性研究[J].水资源保护,2015,31(3):22-26.(LI Xianzhu,SHEN Yubing,MA Xiping,et al.Screening of phenol-degradation bacteria and study of its degradation characteristics[J].Water Resources Protection,2015,31(3):22-26.(in Chinese))
[6]ADAMS B,TIAN M,CHEN A.Design and electrochemical study of Sn O2based mixed oxide electrodes[J].Electrochimica Acta,2009,54(5):1491-1498.
[7]FENG J,JOHNSON D C.Electrocatalysis of anodic oxygen-transfer reactions:titanium substrates for pure and doped lead dioxide films[J].Journal of the Electrochemical Society,1991,138(11):3328-3337.
[8]崔玉虹,冯玉杰,刘峻峰.Sb掺杂钛基Sn O2电极的制备、表征及其电催化性能研究[J].功能材料,2005,36(2):234-237.(CUI Yuhong,FENG Yujie,LIU Junfeng.Preparation and characterization on Sb doped Ti-base Sn O2electro-catalytic electrodes[J].Environmental Science and Technology,2005,36(2):234-237(in Chinese))
[9]马长宝,王栋,周集体,等.高浓度苯酚在石墨电极上电解特性的研究[J].环境科学与技术,2003,26(增刊1):11-12.(MA Changbao,WANG Dong,ZHOU Jiti,et al.The study on electrolytic characteristics of phenol on graphite electrode[J].Environmental Science and Technology,2003,26(sup1):11-12.(in Chinese))
[10]王静,冯玉杰,刘正乾.稀土Gd掺杂对Sn O2电催化电极性能影响的研究[J].功能材料,2005,36(6):877-880.(WANG Jing,FENG Yujie,LIU Zhengqian.Study of the influences of Gd doping on the characteristics of Sn O2catalytic electrodes[J].Journal of Functional Materials,2005,36(6):877-880.(in Chinese))
[11]石绍渊,孔江涛,朱秀萍,等.钛基Sn或Pb氧化物涂层电极的制备与表征[J].环境化学,2006,25(4):429-434.(SHI Shaoyuan,KONG Jiangtao,ZHU Xiuping,et al.Preparation and characterization of Ti-based Sn and Pb oxides electrodes[J].Environmental Chemistry,2006,25(4):429-434.(in Chinese))
[12]杨丽娟,田玫,崔瑞海,等.苯酚在Ti/Sb2O5-Sn O2/Pb O2电极上的降解[J].功能材料,2007,38(9):3349-3351.(YANG Lijuan,TIAN Mei,CUI Ruihai,et al.The degradation of phenol in Ti/Sb2O5-Sn O2/Pb O2electrode[J].Journal of Functional Materials,2007,38(9):3349-3351.(in Chinese))