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β-PbO2/Sb-SnO2/Ti电极的苯酚电催化性能研究

ISSN号：1006-3471
期刊名称：《电化学》
时间：0
分类：TQ050.4[化学工程] X703[环境科学与工程—环境工程]
作者机构：[1]中国矿业大学环境与测绘学院环境工程专业,江苏徐州221116, [2]中国矿业大学化学化工学院矿物加工专业,江苏徐州221116, [3]徐州市工程咨询中心,江苏徐州221116
相关基金：国家自然科学基金项目（No.50908226）、国家自然科学基金创新研究群体项目（No.51221462）; 江苏省自然科学基金基础研究计划资助项目（No.BK201124）; 江苏省研究生培养创新工程（No.CXLX13-956）资助

关键词： Sb-SnO2中间层, β-PbO2/Ti, 极化特性, 电流效率, 加速寿命测试, stannic and antimony oxides interlayer, β-PbO2/Ti, polarization curve, instant current efficiency, accelerated life test

中文摘要：

采用刷涂热解-电镀工艺制得了β-PbO2/Sb-SnO2/Ti电极.采用X射线衍射（X-ray Diffraction,XRD）和扫描电镜（Scanning Electron Microscope,SEM）进行物相组成分析与微观形貌观察.Sb-SnO2中间层抑制PbF2的生成,NaF促进二氧化铅晶粒的成型与分散,消除了β-PbO2聚团.据谢乐公式（Scherrer）计算晶粒尺寸为25.2 nm,电极表面结晶度高达100%.极化测试显示,β-PbO2/Sb-SnO2/Ti电极扩散段电位区、析氧电位和Tafel斜率分别为1.85～2.15 V、2.08 V和0.84,优于β-PbO2/Ti电极的1.40～1.80 V、1.75 V和0.36.使用β-PbO2/Sb-SnO2/Ti、β-PbO2/Ti电极在9 mA·cm-2电流密度对苯酚模拟废水处理240 min,前者COD（Chemical Oxygen Demand）去除率、电流效率（Instant Current Efficiency）高达90.1%和63.28%,优于后者66.9%和44.96%.强化寿命测试表明,β-PbO2/Sb-SnO2/Ti电极与β-PbO2/Ti电极相比延长10倍,工业寿命可达8.6a,有较高的工程应用价值.

英文摘要：

The combination technology of brush pyrolysis and electroplating was employed in the preparation of β-PbO2/Sb-SnO2/Ti electrode. X-ray Diffraction （XRD） and Scanning Electron Microscope （SEM） results showed that the Sb-SnO2 as an interlayer would restrain the formation of lead fluoride and the crystallization degree on the electrode surface could be as high as 100%. The grain size was calculated by Scherrer formula to be 25.2 nm and the agglomeration of lead dioxide was effectively eliminated. The potential span of diffusion control phase, oxygen evolution potential, Tafel slope for the fl-PbOJSb-SnO2/Ti electrode during the polarization were 1.85 - 2.15 V, 2.08 V and 0.84, respectively, which exhibited much better electrochemical properties as compared with those of the B-PbO2/Ti electrode with the values of 1.40 - 1.80 V, 1.75 V and 0.36, respectively. Furthermore, the β-PbO2/Sb-SnO2/Ti and fl-PbO2fri electrodes were taken as anodes participating in the electrocatalysis degradation of phenol simulated wastewater under current density 9 mA. cm-2 within 240 min. Experimental results revealed that the efficiencies of chemical oxygen demand （COD） removal and instant current efficiency （ICE） during phenol degradation were 90.1% and 63.28% for the β-PbO2/Sb-SnO2/Ti electrode, while 66.9% and 44.96% for theβ-PbO2/Ti electrode. Ultimately, the accelerated life test was performed to evaluate the service time of β-PbO2/Sb-SnO2/Ti. The results presented that the industrial life of β-PbO2/Sb-SnO2/Ti was 8.6a, which is 10 times longer than that of β-PbO2/Ti, suggesting that β-PbO2/Sb-SnO2/Ti would have a relatively high engineering application value.

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