Crystal Structure Controlled Synthesis And Characterrization Of Titania Nanocrystals And Supported-Titania Photocatalyst

High concentrated hydrochloric/nitric/sulfuric acid were used to dissolve Ti(OH)₄ produced with TiOSO₄ and ammonia. Then titanium (IV) chloride (TiCl₄), titanium (IV) nitrate (Ti(NO₃)₄) or titanium(IV) sulfate(Ti(SO₄)₂) precursor were obtained. Nanometer titanias in different crystal structures with high specific surface area have been prepared at low temperature by the hydrolysis of TiCl₄, Ti(NO₃)₄ orTi(SO₄)₂ precursor under highly acidic condition. The effect of reaction conditions on the crystal structure and the formation mechanism of crystals structure controlled synthesis of titania nanocrystals in liquid media at low temperature were investigated. The supported TiO₂ photocatalyst, TiO₂ supported by SiO₂/Al₂O₃, was generated directely by liquid deposition method using TiOSO₄ as precursor and SiO₂/Al₂O₃ as supporter. The immobilized photocatalyst, TiO₂ supported by glass fiber, was prepared by calcining method. The ability of photocatalytic degradation of NO was explored in fixed bed photocatalytic reactor made by ourselves. The...