Ti/SnO_2电极在苯酚废水降解中的应用  

Application of Ti/SnO_2 electrode in degradation of phenol wastewater

作　　者：李艳红[1,2] 王三反[1,2] 李志伟[1] LI Yanhong;WANG Sanfan;LI Zhiwei(School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 130010,China;Engineering Research Center for Cold and Arid Regions Water Resource Comprehensive Utilization,Ministry of Education yLanzhou Jiaotong University yLanzhou 730070 y China)

机构地区：[1]兰州交通大学环境与市政工程学院,甘肃兰州730070 [2]兰州交通大学寒旱区水资源综合利用教育部工程研究中心,甘肃兰州730070

出　　处：《水资源保护》2017年第6期92-95,101,共5页Water Resources Protection

基　　金：国家自然科学基金(21466019);国家科技支撑计划(2015BAE04B01)

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/Sn02 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 CO2 and H20, and the voltage was 8V. The lifetime of the electrode was measured at 25℃ , 0.5 mol/L H2S 0 4 solution a n d 500 A/m2 constant flow. The electrode life was only 8 hours and the life was short.

关 键 词：热分解法 Ti/Sn O2 苯酚浓度 电极寿命 

分 类 号：X703.3[环境科学与工程—环境工程]