摘要
用热分解方法制备了钛基二氧化锡阳极 (SnO2 /Ti) ,对比研究了空气 /氧气 2种热处理气氛对电极性能的影响 .用扫描电镜 (SEM )观察了电极表面形貌 ,对电极表面主要膜元素的化学状态进行了X射线光电子能谱 (XPS)分析 .对电极在不同溶液的动电位极化行为进行了测试 ,研究了 2种电极在 5mA/cm2 恒电流状态下对 p 苯醌的电解催化去除性能 .SEM观察表明 ,2种电极表面都为典型的泥裂形貌 ,但在氧气气氛中退火处理的电极具有更大的活性表面积 .XPS分析发现 ,在氧气气氛中退火处理的电极表面Sn3d5/ 2 、Sb3d5/ 2 电子的结合能较在空气气氛中退火处理的低 0 15eV .动电位极化测试结果与恒电流电解实验结果都表明 ,在氧气气氛中退火处理的电极对水中p 苯醌具有更好的电化学催化去除性能 .在电解进行至溶液完全脱色的情况下 ,氧气气氛中退火处理的电极对水中TOC的去除率为 76 3% ,而空气气氛中退火处理的电极对水中TOC的去除率为 6 3 3% .在 2种电极条件下 ,溶液中TOC浓度随电解时间的变化规律均符合指数变化规律 .
Sb-doped SnO 2/Ti anode was prepared in our lab with thermal decomposition method,and in the same time, the effect of heat treatment on the properties of the electrode also was studied. Scanning electron microscopy (SEM) was used to study the surface characterization of the electrodes. X-ray photoelectro-spectroscopy (XPS) measurements were carried out to study the chemical state of elements, Sn and Sb. The potentiodynamic polarization behaviors of the two anodes in different solutions were performed. Galvanostatic electrolyses were carried out at 5mA/cm2 to study the electrocatalytic activity of the two anodes in removing organic pollutant. SEM showed that the electrodes had the same well-known cracked-mud structure, while the electrode annealed in O 2 [SnO 2/Ti(O 2)] had more larger surface area than the electrode annealed in the air [SnO 2/Ti(air)]. XPS measurements showed that the binding energies of both Sn3d 5/2 and Sb3d 5/2 of SnO 2/Ti(O 2) were 0.15eV smaller than what of the SnO 2/Ti(air) film. Both of the electrochemical measurements and electrolyses results confirmed that SnO 2/Ti(O 2) was more active in the degradation of organic pollutant. The galvanostatic electrolyses were lasted until the solutions were decoloured throughly, 76.3% of total organic carbon (TOC) was removed with SnO 2/Ti(O 2), compared with 63.3% of SnO 2/Ti(air). The similar exponential rules were driven for the variations of residual TOC concentration with two anodes.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2004年第1期30-34,共5页
Environmental Science
基金
国家杰出青年基金资助项目 ( 50225824)
王宽诚博士后奖励基金资助项目
