CIESC Journal ›› 2021, Vol. 72 ›› Issue (5): 2810-2816.DOI: 10.11949/0438-1157.20201252

• Energy and environmental engineering • Previous Articles     Next Articles

Electro-oxidation information of p-toluene sulfonic acid on Ti/PbO2 electrode

YE Zhiping(),ZHOU Danfei,LIU Zifeng,ZHOU Qingqing,WANG Jiade()   

  1. College of Environment, Zhejiang University of Technology, Hangzhou 310032, Zhejiang, China
  • Received:2020-09-01 Revised:2020-10-26 Online:2021-05-05 Published:2021-05-05
  • Contact: WANG Jiade

对甲基苯磺酸在Ti/PbO2电极上的电氧化反应信息

叶志平(),周丹飞,刘梓锋,周青青,王家德()   

  1. 浙江工业大学环境学院,浙江 杭州 310032
  • 通讯作者: 王家德
  • 作者简介:叶志平(1987—),男,博士,副教授,zhipingye@zjut.edu.cn
  • 基金资助:
    国家自然科学基金项目(51878614)

Abstract:

In situ infrared spectroscopy was used to systematically study the electro-oxidation reaction information of p-toluenesulfonic acid (p-TSA) on the titanium-based lead dioxide (Ti/PbO2) electrode. The results of cyclic voltammentry curve indicated that Ti/PbO2 electrode exhibited a high electrochemical activity for the oxidation of p-TSA, and the direct oxidation potential ranged from 0.55—0.9 V. When the voltage was less than 1000 mV (vs. SCE), the multi-step potential FTIRS (MSFTIRS) and time-resolved FTIRS (TRFTIRS) analysis showed that the p-TSA was in the process of breaking of sulfonic acid group and methyl group oxidation of side-chain of benzene ring . When the voltage was higher than 1000 mV (vs. SCE), the aromatic ring of p-TSA was degradated. Meanwhile, the compounds of acid, alcohol and ketone were generated. The results of the reaction kinetics study showed that the apparent rate constant K of p-TSA electrooxidation has a linear relationship with the current density j, the removal of chemical oxygen demand (COD) increased with the increase of specific charge, and the average current efficiency showed a downward trend.

Key words: p-toluene sulfonic acid, in situ FTIR, titanium-based lead dioxide, electrochemical oxidation, reaction kinetics

摘要:

采用原位红外光谱法系统地研究了对甲基苯磺酸(p-TSA)在钛基二氧化铅(Ti/PbO2)电极上的电氧化反应信息。循环伏安曲线显示,Ti/PbO2p-TSA有良好的电氧化活性,直接氧化电位区间为0.55~0.9 V。多步电位阶跃FTIRS(MSFTIRS)和时间分辨FTIRS(TRFTIRS)分析显示,电压小于1000 mV时,p-TSA主要发生了磺酸基的脱落和苯环侧链甲基的氧化;电压大于1000 mV时,p-TSA的苯环骨架被破坏,同时生成了酸、醇、酮。反应动力学研究结果表明,p-TSA电氧化表观速率常数K与电流密度j呈线性关系,化学需氧量(COD)去除量随比电荷增大而增加,平均电流效率则呈下降趋势。

关键词: 对甲基苯磺酸, 原位红外光谱, 钛基二氧化铅, 电化学氧化, 反应动力学

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