Imaging Science and Photochemistry ›› 2006, Vol. 24 ›› Issue (3): 197-203.DOI: 10.7517/j.issn.1674-0475.2006.03.197

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Photoinduced Hydroxyl Radicals and Photocatalytic Performance of Nd2O3/TiO2 Photocatalysts

LI Hui-quan1, CHEN Wei-fan2, CUI Yu-min1   

  1. 1. Chemistry Department, Fuyang Normal College, Fuyang 236041, Anhui, P. R. China;
    2. National Special Superfine Powder Engineering Research Center, Nanjing University of Science and Technology, Nanjing 210094, Jiangsu, P. R. China
  • Received:2005-12-13 Revised:2006-02-20 Online:2006-05-23 Published:2006-05-23

Abstract: Nd2O3/TiO2 photocatalysts were prepared by sol-gel method using neodymium nitrate and tetrabutyl titanate as precursors,and characterized by means of XRD and BET.After the doped with Nd2O3,the particle diameter of catalyst was decreased,the specific surface area was increased,the formation rate of hydroxyl radical on the catalyst was increased,and the catalytic activity was improved.Using methyl orange as the model compound of the photocatalytic degradation reaction,the activity of the prepared photocatalysts was investigated in suspension irradiated by high-pressure mercury lamp;and the hydroxyl radical produced in the supernatant of the irradiated catalyst suspension containing terephthalic acid were also investigated by measuring the fluorescence derived by the reaction with terephthalic acid.As a result,the addition of Nd2O3 to TiO2 notably enhanced its photocatalytic activity.The adsorption constants of methyl orange on the Nd2O3 doped catalysts and the nonmodified TiO2 catalyst were evaluated,and the result showed the adsorption of methyl orange on the Nd2O3/TiO2 catalysts was improved.The optimum loading amount of Nd ion is 1.0%(molar ratio).

Key words: photocatalysis, TiO2, Nd2O3, hydroxyl radicals, methyl orange

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