Imaging Science and Photochemistry ›› 2006, Vol. 24 ›› Issue (2): 102-109.DOI: 10.7517/j.issn.1674-0475.2006.02.102

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An Experimental Study on the Production Efficiency of Hydroxyl Radicals by Several Photocatalysis Reaction Systems

WU Shao-lin, XIE Si-cai, YANG Li, DAI Yu-fen, ZHONG Yu-feng   

  1. Department of Environmental and Chemical Engineering, NanChang Institute of Aeronautical Technology, NanChang 330034, Jiangxi, P. R. China
  • Received:2005-08-16 Revised:2005-12-26 Online:2006-03-23 Published:2006-03-23

Abstract: By using a Phenanthroline Hydrate-Fe(Ⅱ)(salmon pink) Spectro-measurement to dictate the production efficiency of the hydroxyl radicals by the Fenton,UV/Fenton,UV/Fe(Ⅲ)-Oxalate/ H2O2,UV/TiO2 under the different conditions,analyzed the mechanism reaction of different major factors.The results show that the optimal reaction conditions were pH=4.0,m(H2O2)/m(Fe)=1/25,and quality concentration of iron about 25 mg/L for the Fenton、UV/Fenton、UV/Fe(Ⅲ)-Oxalate/H2O2.The production efficiency of the hydroxyl radicals by UV/TiO2 was smaller changed with the change of the environmental pH relative Fenton、UV/Fenton、UV/Fe(Ⅲ)-Oxalate/H2O2,but the production efficiency of the hydroxyl radicals by UV/TiO2 was the lowest and UV/Fe(Ⅲ)-Oxalate/H2O2 was the best among the four mechanism reaction systems.

Key words: hydroxyl radicals, photocatalysis, spectro-measurement

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