| 摘要 |
<p>This invention provides silica gel carrying a titanium oxide photocatalyst in a high concentration that improves performances in decomposing and removing smelly and toxic substances in the air, or organic solvents, agricultural chemicals, etc. in water, and that has properties excellent from the viewpoint of safety, economic efficiency, stability, and water-resistance (it does not break apart when it is put into water), by providing a concentration gradient of titanium oxide such that the concentration of titanium oxide near the surface of the silica gel is high and the concentration of titanium oxide of the central part of the silica gel is low, and a method for the preparation thereof. The silica gel carrying a titanium oxide photocatalyst in a high concentration of the present invention is characterized in that the concentration of the titanium oxide contained in the pores near the surface of the silica gel is 7 - 70% by weight, said silica gel having an average pore diameter of 6 - 100 nm, provided that the concentration gradient is provided such that the amount of the titanium oxide contained in the pores near the surface of the silica gel is 1.5 times or more than the amount of the titanium oxide contained in the pores near the central part of the silica gel.</p> |
