摘要
采用电沉积法制备氧化铌掺杂的钛基PbO2电极,通过X射线衍射、扫描电镜和电化学工作站进行表征.结果表明,掺杂氧化铌改变了沉积PbO2的晶型分布,电极表面出现α-PbO2晶型,提高了镀层与基体的结合度及电子传递效率;同时晶体尺寸略有增大,排列规整均匀.氧化铌最佳掺杂质量浓度为3.5 g/L,改性电极的析氧电位上升到1.523 V,阶跃氧化电流达到0.155 9 A,强化寿命延长到702 min,电催化性能和稳定性均有明显提升.利用所制备改性电极降解分散蓝B的最佳降解条件:溶液pH值为2,电解质NaCl浓度为0.7 mol/L,电流密度为40 mA/cm2,1 h后脱色率可达89%,脱色动力学可用拟2级反应描述.
The Nb2O5/PbO2 electrode based on Ti substrate was prepared by electrodeposition method. Properties of the electrode were investigated by XRD, SEM and electrochemical measurements. The results showed that the Nb205 doping led to transformation of crystalline form, and α-PbO2 was formed in the surface of the anode, which improved the binding degree between the coating and substrate as well as efficiency of electron-transfer. It also led to the increase of the erystallite size and the particles were arranged regularly and uniformly. When the optimum doping content of Nb2O5 was 3.5 g/L, oxygen evolution potential increased to 1. 523 V, step current was 0. 1559 A, and strengthening lifetime reached 702 min. Compared with PbO2 electrode, Nb2O5/PbO2 electrode signifi-cantly enhanced electroeatalytic performance and stability. The modified electrode was effective in degradation of disperse blue B. The best degradation conditions were： pH = 2; concentration of electrolyte c （NaC1） = 0.7 mol/L; current density was 40 mA/cm^2. After 1 h, the decoloration rate of disperse blue B reached up to 89%. The apparent kinetics of the deeolorization reaction followed a second-order behavior.
出处
《深圳大学学报（理工版）》
EI
CAS
北大核心
2013年第1期42-47,共6页
Journal of Shenzhen University(Science and Engineering)
基金
国家自然科学基金资助项目(21277098)
上海市科委自然科学基金资助项目(10ZR1432500)~~
关键词
电化学
钛基PbO2电极
电沉积
氧化铌
分散蓝B
氧化
难降解有机废水
染料废水
electrochemistry
Ti-PbO2 electrode
electrodeposition
Nb2O5
disperse blue
oxidation
refractoryorganic waster water
dyeing waster water
