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高等学校化学研究 ›› 2012, Vol. 28 ›› Issue (5): 891-896 .

• Articles • 上一篇    下一篇

Electrochemical Degradation of o-Chloronitrobenzene by Three-dimensional Electrodes

MENG Qing-han, WANG Jing, LIU Ling, CAO Bing   

  1. College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, P. R. China
  • 收稿日期:2011-12-14 修回日期:2012-02-16 出版日期:2012-09-25 发布日期:2012-09-07
  • 通讯作者: CAO Bing E-mail:bcao@mail.buct.edu.cn
  • 基金资助:
    Supported by the National Natural Science Foundation of China(Nos.50602003, 50502004) and the Beijing Science & Technology Star Plans, China(No.2007B020).

Electrochemical Degradation of o-Chloronitrobenzene by Three-dimensional Electrodes

MENG Qing-han, WANG Jing, LIU Ling, CAO Bing   

  1. College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, P. R. China
  • Received:2011-12-14 Revised:2012-02-16 Online:2012-09-25 Published:2012-09-07
  • Supported by:
    Supported by the National Natural Science Foundation of China(Nos.50602003, 50502004) and the Beijing Science & Technology Star Plans, China(No.2007B020).

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摘要： Degradation of o-chloronitrobenzene wastewater was experimentally investigated at a three-dimensional electrode(TDE) with granular activated carbon as the particle electrode, graphite as the anode, and stainless steel plate as the cathode. The kinetic model of o-chloronitrobenzene degradation was studied, and the effects of pH, electrolysis time, particle electrode, electrolyte concentration, and initial concentration of the solution on degradation efficiency were investigated to determine the optimal operating conditions. The degradation of o-chloronitrobenzene by oxidation at the TDE was monitored by chemical oxygen demand(COD) measurements, UV-Vis absorption, and high performance liquid chromatography(HPLC). COD degradation by electrochemical degradation followed pseudo-first order kinetics with respect to the concentration of o-chloronitrobenzene solutions. Optimal reaction conditions included 15 g of activated carbon as the particle electrode, 400 mg/L o-chloronitrobenzene solution containing 0.10 mol/L Na2SO4, pH=3, and 60 min of electrolysis. The UV-Vis absorption spectra and HPLC results illustrate that the benzene ring in o-chloronitrobenzene was rapidly broken down to form aliphatic substances through electrochemical degradation. COD degradation was approximately 98.5% at optimal conditions.

关键词: Three-dimensional electrode, Electrochemical oxidation, o-Chloronitrobenzene

Abstract: Degradation of o-chloronitrobenzene wastewater was experimentally investigated at a three-dimensional electrode(TDE) with granular activated carbon as the particle electrode, graphite as the anode, and stainless steel plate as the cathode. The kinetic model of o-chloronitrobenzene degradation was studied, and the effects of pH, electrolysis time, particle electrode, electrolyte concentration, and initial concentration of the solution on degradation efficiency were investigated to determine the optimal operating conditions. The degradation of o-chloronitrobenzene by oxidation at the TDE was monitored by chemical oxygen demand(COD) measurements, UV-Vis absorption, and high performance liquid chromatography(HPLC). COD degradation by electrochemical degradation followed pseudo-first order kinetics with respect to the concentration of o-chloronitrobenzene solutions. Optimal reaction conditions included 15 g of activated carbon as the particle electrode, 400 mg/L o-chloronitrobenzene solution containing 0.10 mol/L Na2SO4, pH=3, and 60 min of electrolysis. The UV-Vis absorption spectra and HPLC results illustrate that the benzene ring in o-chloronitrobenzene was rapidly broken down to form aliphatic substances through electrochemical degradation. COD degradation was approximately 98.5% at optimal conditions.

Key words: Three-dimensional electrode, Electrochemical oxidation, o-Chloronitrobenzene