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化学学报
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化学学报 ›› 2010, Vol. 68 ›› Issue (19): 1961-1964. 上一篇    下一篇

研究论文

Keggin型缺位杂多阴离子PW11O397-电催化降解硝基苯  

王崇太1，华英杰*,1，韦吉崇1，麦发刚1，张大帅1，童叶翔2   

  1. (1海南师范大学化学与化工学院 海口 571158)
    (2中山大学化学与化工学院 广州 510275)
  • 投稿日期:2009-10-09 修回日期:2010-05-29 发布日期:2010-06-07
  • 通讯作者: 王崇太 E-mail:wct581@sina.com
  • 基金资助:

    国家自然科学资金项目（No.20963003）; 海南省重点科技项目（No.080305; No.090803）;吉林省科技发展计划项目（No.20090595）

Electrocatalytic Degradation of Nitrobenzene by Keggin-type Lacunary Heteropolyanion PW11O397 -

Wang Chongtai1 Hua Yingjie*,1 Wei Jichong1 Mai Fagang1 Zhang Dashuai1 Tong Yexiang2   

  1. (1 School of Chemistry and Chemical Engineering, Hainan Normal University, Haikou 571158)
    (2 School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou 510275)
  • Received:2009-10-09 Revised:2010-05-29 Published:2010-06-07
  • Contact: chongtai wang E-mail:wct581@sina.com

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以Keggin型缺位杂多阴离子 (PW11)为电催化剂, 硝基苯(NB)为模型污染物, 研究了Na2SO4-NaHSO4 介质中 对NB的电催化降解作用. 实验结果表明, 在 pH＝2.5, E＝－0.6 V和O2流速为60 mL•min－1的条件下, 初始浓度为0.5 mmol•L－1的硝基苯反应80 min即完全降解, 反应120 min总有机碳(TOC)去除达42%. 硝基苯的电催化降解服从准一级反应动力学模型, 室温下其表观速率常数kobs的大小与NB的初始浓度有关, 当NB的初始浓度为0.5, 0.9和1.3 mmol•L－1时, kobs值分别为1.0×10－1, 6.0×10－2和4.1×10－2 min－1.

关键词: 缺位杂多阴离子, 电催化, 硝基苯降解, 矿化率

With Keggin-type lacunary heteropolytungstate anion as an electrocatalyst and nitrobenzene (NB) as a model pollutant the electrocatalytic degradation of NB by in Na2SO4＋NaHSO4 medium was studied. Experimental results revealed that a complete NB degradation was obtained in less than 80 min in pH 2.5 Na2SO4-NaHSO4 solution containing 0.5 mmol•L－1 NB at the potential of －0.6 V and the O2 flow rate of 60 mL•min－1. A total organic carbon (TOC) removal reached 42% at 120 min reaction time. The NB degradation reaction followed the pseudo-first order kinetic regime and the observed rate constants kobs related to the initial NB concentration at room temperature was determined to be 1.0×10－1, 6.0×10－2 and 4.1×10－2 min－1 corresponding to 0.5, 0.9 and 1.3 mmol•L－1 initial NB concentrations, respectively.

Key words: lacunary heteropolyanion, electrocatalysis, nitrobenzene degradation, mineralization rate