Acta Phys. -Chim. Sin. ›› 2005, Vol. 21 ›› Issue (01): 84-88.doi: 10.3866/PKU.WHXB20050117

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Synthesis and Properties of CoO/SrTiO3 for the Photocatalytic Decomposition of Water

WANG Gui-Yun;WANG Yan-Ji;ZHAO Xin-Qiang;SONG Bao-Jun   

  1. College of Chemical Engineering, Hebei University of Technology, Tianjin 300130
  • Received:2004-05-21 Revised:2004-07-21 Published:2005-01-15
  • Contact: WANG Yan-Ji E-mail:yjwang@hebut.edu.cn

Abstract: SrTiO3 powder with high crystal perfection was synthesized by solid-state reaction of strontium nitrate with TiO(OH)2 formed by hydrolysis of tetra-butoxy titanium in the presence of alkali metal compound mineralizer. Then a photocatalyst, CoO/SrTiO3, was prepared by impregnation method. The effect of the mineralezers is decreased in the following order :KOH > NaOH > NaNO3 > KNO3.The photocatalytic activity of CoO/SrTiO3,was increased for ca.8 times when KOH mineralizer was added, with the irradiation of 400 W high-pressure mercury lamp, the hydrogen-generation rate amounts to 480 μmol•g cat-1•h-1 over the CoO/SrTiO3,catalyst.Characterization results from SEM and UV-Vis diffuse reflection spectra analysis show that the solid-state reaction for synthesizing SrTiO3 proceeds completely and the crystal perfection of SrTiO3 is improved by adding KOH mineralizer. The suitable amount of KOH is 2.0%(w).

Key words: Photocatalysis, Strontium titanate, Water decomposition, Crystal perfection