シリカゲル担持TiO_2微粒子光触媒の作製

概要

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The composite silica gel which supported nanometer size Ti02 fine particles with platinum was prepared by the sol gel method in order to obtain a high photocata lylic activity and to discuss the mechanism of pho tocatalytic hydrogen generation by TiO_2 fine particles in aqueous solution. The heat treated composite gel showed hydrogen generation rate almost 4 times larg er than that of TiO_2 sol in aqueous ethanol solution. However, Iittle hydrogen was generated from pure deiollized water. The photocatalyiic activity of the com posite gel is considered to be affected by both the sur face condition and the crystalline phase of TiO_2 fine par ticles when the correlation among the changes with heat treatment in hydrogen generation rate was exa mined, the amount of photogenerated Ti^<3+> ions and the structure of composite gel. The superiority of the hydrogen photogeneration rate of the composite gel compared with a TiO_2 suspension system is attributed to its controllability of the crystallite size and the crys tanine phase of semiconductor fine particles since they remain in a highly dispersive condition during heat treatment.
社団法人日本セラミックス協会の論文
1994-08-01