十二烷基二甲基甜菜碱对Ti/PbO_2电极的改性研究  

Modification of Ti/PbO_2 Electrode with Dodecyl Dimethyl Betaine

作　　者：李晓良[1] 徐浩[1] 延卫[1] LI Xiaoliang;XU Hao;YAN Wei(Department of Environmental Science and Engineering, Xi＇an Jiaotong University, Xi＇an 710049, China)

机构地区：[1]西安交通大学环境科学与工程系,西安710049

出　　处：《西安交通大学学报》2017年第5期142-148,共7页Journal of Xi'an Jiaotong University

基　　金：国家自然科学基金资助项目(21507104)

摘　　要：为了提高PbO2电极在处理有机废水过程中的催化性能及稳定性能,采用两性离子型表面活性剂十二烷基二甲基甜菜碱(BS-12)以电沉积方式对PbO_2电极进行改性。利用扫描电镜、X射线衍射对电极涂层进行形貌、晶相分析,通过循环伏安扫描、交流阻抗、X射线光电子能谱、降解酸性红G(ARG)和强化寿命实验对电极性能进行评估,并考察了BS-12对电极性能的影响。结果表明,BS-12可明显细化电极表面颗粒,增大涂层比表面积,提高电极析氧过电位和电荷传输速率,适量的改性可有效提高电极的催化性能及稳定性能。对于最优改性电极PbO_2-BS-12(0.1),电解60min后ARG的脱色率高达85.1%,其强化寿命可达到138.5h,是改性前电极寿命(96h)的1.4倍多。To improve the catalytic performance and stability of Ti/PbO2 electrode in the treatment of organic wastewater, dodecyl dimethyl betaine （BS-12） was adopted to modify Ti/ PbO2 electrode through electro-codeposition technology. Scanning electron microscope and X-ray diffraction were used to characterize the morphology and crystal phase of the modified electrode. Cyclic voltammetry, electrochemical impedance spectroscopy, X-ray photoelectron spectroscopy, as well as ARG degradation and accelerated life tests were employed to investigate the performance of the electrode. The effect of BS-12 on the performance of the electrode was also studied. The results showed that BS-12 could significantly refine the grain size, increase the specific surface area, and improve the oxygen evolution potential and charge transfer rate. The catalytic performance and stability of Ti/PbO2 electrode could be effectively improved by the modification with proper amount of BS-12. For the most optimal electrode （PbO2-BS-12（0.1））, the decolorization rate of ARG could reach 85.1% after 60 minutes electrolysis, and the accelerated service life was 138.5 hours, which was more than 1.4 times that of PbO2 electrode （96 h）.

关 键 词：十二烷基二甲基甜菜碱 改性 PBO2电极 电催化氧化 废水处理 

分 类 号：X703.1[环境科学与工程—环境工程]