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化学学报
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化学学报 ›› 2007, Vol. 65 ›› Issue (20): 2257-2260. 上一篇    下一篇

研究论文

硫酸溶液中苯酚在Ti/PbO2电极上的循环伏安研究

董艳杰，林海波*，刘小波，任秀彬，姜梅   

  1. (吉林大学化学学院 长春 130012)
  • 投稿日期:2006-11-13 修回日期:2007-03-30 发布日期:2007-10-28
  • 通讯作者: 林海波

A Cyclic Voltammetric Study of Phenol on Ti/PbO2 Electrode in H2SO4 Solution

DONG Yan-Jie LIN Hai-Bo* LIU Xiao-Bo REN Xiu-Bin JIANG Mei   

  1. (College of Chemistry, Jilin University, Changchun 130012)
  • Received:2006-11-13 Revised:2007-03-30 Published:2007-10-28
  • Contact: LIN Hai-Bo

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用循环伏安法研究了Ti/PbO2电极在苯酚硫酸溶液中的电催化作用. 结果表明, 在硫酸溶液中, Ti/PbO2阳极对苯酚具有电催化氧化作用. 如果苯酚浓度较低, 产生的吸附态羟基自由基可以将苯酚氧化, 直至完全矿化. 当苯酚浓度较高或产生的羟基自由基量相对较小时, 苯酚或中间产物可吸附在电极表面, 降低电极的真实表面积, 减少电极的活性点, 阻止反应物接近电极表面, 抑制苯酚的进一步氧化. 随着电解时间的延长, 这些吸附物由于逐渐被氧化, 电极活性恢复.

关键词: 苯酚, 循环伏安, Ti/PbO2电极, 电化学氧化

The electrocatalytic performance of Ti/PbO2 electrode was investigated during the electrochemical oxidation of phenol in H2SO4 solution by cyclic voltammetry. The results have shown that Ti/PbO2 electrode have strong oxidation properties for phenol in H2SO4 solution. In a low initial concentration of phenol, phenol can be oxidized by adsorbed hydroxy radicals generated on electrode and finally mineralized. In a higher concentration phenol or little adsorbed hydroxy radicals generated, phenol and its intermediates may be adhesive to the electrode surface, consequently diminishes the electrochemical active surface area of electrode leading to the decrease of active sites, prevents the reactants from approaching the electrode surface and inhibits the further oxidation of phenol. With the increase of electrolysis time, the electrode activity can be restored due to the gradual oxidation of the substances adsorbed on electrode surface.

Key words: phenol, cyclic voltammetry, Ti/PbO2 electrode, electrochemical oxidation