Journal of East China Normal University(Natural Sc ›› 2007, Vol. 2007 ›› Issue (6): 62-68,9.

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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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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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