华东师范大学学报(自然科学版) ›› 2007, Vol. 2007 ›› Issue (6): 62-68,9.

• 化学 • 上一篇    下一篇

纳米ZnO膜光催化氧化测定化学需氧量的应用研究

陆华1，曲云鹤2，周天舒3，郑蕾2，施国跃2   

  1. 1.楚雄师范学院 化学系，云南 楚雄675000; 2.华东师范大学 化学系，上海200062; 3.华东师范大学 环境科学系，上海200062
  • 收稿日期:2006-09-29 修回日期:2006-10-27 出版日期:2007-11-25 发布日期:2007-11-25
  • 通讯作者: 施国跃

Determination of Chemical Oxygen Demand Values by Photocatalytic Oxidation Using Nano ZnO Film on Quartz(Chinese)

LU Hua1,QU Yun-he2,ZHOU Tian-shu3,ZHENG Lei2,SHI Guo-yue2   

  1. 1.Department of Chemistry,Chuxiong Normal University,Chuxiong Yunnan675000,China; 2.Depatrment of Chemistry,East China Normal University,Shanghai 200062,China; 3.Department of Environmental Science,East China Normal University,Shanghai200062,China
  • Received:2006-09-29 Revised:2006-10-27 Online:2007-11-25 Published:2007-11-25
  • Contact: SHI Guo-yue

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摘要： 提出了一种利用石英管负载的纳米ZnO膜光催化测定化学需氧量的方法.通过添加无机强氧化剂K2Cr2O7提高光催化体系对有机物的降解效率，在光催化氧化有机物的同时,K2Cr2O7也会被纳米ZnO表面的光生电子还原为Cr(Ⅲ)，根据Cr(Ⅲ)浓度的变化量确定水样化学需氧量的值.实验结果表明，在50~1 000 mg/L的COD范围内，Cr(Ⅲ)浓度的变化量与标准水样中的CODCr值成正比例关系，检出限为20 mg/L.将该方法用于实际水样检测，分析时间短，减少了二次污染，光催化反应后水样无需后处理可直接进行测定,且与国家COD标准分析法具有好的相关性.

关键词: 纳米ZnO, K2Cr2O7, 光催化, 化学需氧量（COD）, 纳米ZnO, K2Cr2O7, 光催化, 化学需氧量（COD）

Abstract: A COD measurement by photocatalytic oxidation using nano ZnO film was investigated.K2Cr2O7 was added into the solution to enhance the efficiency of photocatalytic degradation,and simultaneously K2Cr2O7 was reduced to Cr(Ⅲ) by photogenerated electrons which were adsorbed on the surface of ZnO.The measuring principle was based on direct determination of Cr(Ⅲ) concentration which was proportional to the COD value.Under the optimized experiment condition,the application range was 50~1 000 mg/L,and the detection limit was 20 mg/L.The immobilization of photocatalyst on the supports could not only solve the problem of low recovery of the catalyst and hard separation from the solution,but also overcome its shortcoming of poor stability.Applying this method to the determination of real samples,it was found to be rapid and environmentally friendly.Additionally,the method proposed above for determination of COD was in excellent correspondence with values obtained by using the conventional method.

Key words: photocatalytic oxidation, chemical oxygen demand, nano ZnO film, photocatalytic oxidation, chemical oxygen demand

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