| 摘要 |
PURPOSE: Provided are a hydrophilic photocatalyst membrane formed on the existing materials and its preparation method. The hydrophilic photocatalyst membrane is coated on the above materials to prevent them from condensation of moisture. The membrane is characterized in that it contains 0.1mol% to 10mol% of aluminum oxides and tungsten oxides to the main component, titanium oxides. The catalyst recovers hydrophilic character at low light intensity and maintains high hydrophilicity even when blocked from the light for a long time. CONSTITUTION: The preparation method includes: making each liquid precursors of titanium oxide, aluminum oxide and tungsten oxide wherein the oxides of aluminum and tungsten are organic or inorganic oxides and are in a sol form; mixing the above precursors with a solution containing anhydrous ethanol and nitric acid, whereas aluminum oxide and tungsten oxide as additives are in a ratio of 0.1mol% to 10mol% to the main component of titanium oxide while the ratio of aluminum oxide and tungsten oxide themselves is 1:1-1:2 and the sum of both oxides is not more than 5mol%; coating the above solution mixtures on a surface of the existing materials in the thickness of not more than 2μm; and baking and heat treating the materials coated with mixed solutions at 300-600deg.C.
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