Abstract
A new method of sensitizing titania by treatment of the reaction mixture with Methylene Blue, Methyl Red or hydrogen peroxide is developed; the sensitizer was introduced into the reaction mixture while synthesizing nanosize TiO2 from titanyl sulfate. The samples prepared by this method are compared to the samples prepared by cold impregnation of Methylene Blue, Methyl Red or hydrogen peroxide on titania, pre-synthesized by sulfate method, or commercial Degussa P25 and Hombikat UV100. The samples were characterized by X-ray diffraction; their photocatalytic activity was studied in the model reaction of Methyl Orange decomposition in aqueous solution under UV and visible light. The highest photocatalytic activity under visible light was found for titania, sensitized with titanium peroxo complexes by the new method. It is also active for photodegradation of salicylic acid under visible light.
Highlights
A new method of sensitizing titania by treatment of the reaction mixture with Methylene Blue, Methyl Red or hydrogen peroxide is developed; the sensitizer was introduced into the reaction mixture while synthesizing nanosize TiO2 from titanyl sulfate
The samples prepared by this method are compared to the samples prepared by cold impregnation of Methylene Blue, Methyl Red or hydrogen peroxide on titania, pre-synthesized by sulfate method, or commercial Degussa P25 and Hombikat UV100
The samples were characterized by X-ray diffraction; their photocatalytic activity was studied in the model reaction of Methyl Orange decomposition in aqueous solution under UV and visible light
Summary
A new method of sensitizing titania by treatment of the reaction mixture with Methylene Blue, Methyl Red or hydrogen peroxide is developed; the sensitizer was introduced into the reaction mixture while synthesizing nanosize TiO2 from titanyl sulfate. The highest photocatalytic activity under visible light was found for titania, sensitized with titanium peroxo complexes by the new method. It is active for photodegradation of salicylic acid under visible light. Epling and Lin (2002) investigated photo-assisted bleaching of 15 dyes utilizing TiO2 and visible light; good rate for Methylene Blue (MeB) decomposition can be explained by titania sensitization; the MeB photobleaching rates were: anatase [ amorphous titania [ rutile. The films showed high photocatalytic activity under UV light; no experiments using visible light were carried out in these works. Karuppuchamy and Jeong (2006) prepared amorphous powder of titanium peroxo complex from TiOSO4 and H2O2 at room temperature, which was converted to anatase by heat treating at 300 °C; photocatalytic activity of the product was not studied
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