催化学报

催化学报 ›› 2008, Vol. 29 ›› Issue (1): 15-18.

• 研究论文 • 上一篇    下一篇

Fenton试剂增强电晕放电技术降解甲苯

康颖,吴祖成,李明波,王晓暾   

  1. 浙江大学环境科学研究所, 浙江杭州 310027
  • 收稿日期:2008-01-25 出版日期:2008-01-25 发布日期:2011-12-25

Enhancement of Toluene Degradation by Corona Discharge in the Presence of Fenton-Type Reagents

KANG Ying, WU Zucheng*, LI Mingbo, WANG Xiaotun   

  1. Institute of Environmental Science, Zhejiang University, Hangzhou 310027, Zhejiang, China
  • Received:2008-01-25 Online:2008-01-25 Published:2011-12-25

PDF

785

被引次数

25

摘要： 通过气溶胶分散技术将芬顿(Fenton)试剂引入气相反应体系来增强电晕放电对污染物甲苯的降解. 含Fe2+、Co2+和Mn2+等过渡金属离子的催化剂溶液以微液滴形式添加入反应器电晕区,考察了催化剂对甲苯蒸气降解速率的影响,发现甲苯平均降解速率均有显著提高. 在这三种金属离子溶液浓度均为0.05 mol/L, 电极气流量为0.6 m3/h和极间电压为23 kV时,甲苯(初始浓度为900 mg/m3)降解速率增强因子β分别为1.29, 1.28和1.51. 气相和液相中降解产物的分析表明,微液滴内发生的电Fenton反应将电晕放电产生的H2O2转化为具有更强氧化性的羟基自由基(HO·), 而甲苯的中间产物溶解在微液滴中,增强了甲苯的降解速率.

关键词: 气溶胶分散, 电晕放电, 甲苯, 类芬顿试剂

Abstract: Electro-Fenton reactions were used to enhance the degradation of toluene in gas phase corona discharge by aerosol dispersion. The catalysts can remarkably increase the average degradation rate of toluene. The enhancement factors (β) of toluene degradation rate at gas flux = 0.6 m3/h and initial toluene concentration = 900 mg/m3 were 1.29, 1.28, and 1.51, respectively, using 0.05 mol/L of Fe2+, Co2+, and Mn2+Fenton-type reagents at the applied voltage of 23 kV. These three elements possess similar catalytic activity, with Mn2+showing a slightly better result than Co2+and Fe2+. When the catalyst concentration was0.03-0.1mol/L, the enhancement of toluene degradation rate was more obvious. The degradation products of toluene such as phenyl aldehyde, benzoic acid, and fumaric acid were detected in liquid phase samples collected in the catalyst trap chamber. The increase in toluene degradation rate is due to the dissolution of intermediate products in micro-droplets and the occurrence of electro-Fenton reactions in them. The combination of aerosol dispersion and electro-Fenton reactions may have an important application in air pollution treatment.

Key words: aerosol dispersion, corona discharge, toluene, Fenton-type reagent