Method for producing photocatalyst and photocatalyst filter for air cleaning

1. A method for producing a photocatalyst for air cleaning, the method comprising the steps of:

preparing titanium dioxide (TiO 2 );

attaching platinum to a surface of the titanium dioxide by a photodeposition method;

mixing the platinum-attached titanium dioxide in the powder form with a volatile solvent to prepare a paste;

spreading the paste on a substrate;

drying the paste on the substrate; and

producing a surface-modified titanium dioxide by replacing a hydroxyl group in the platinum-attached surface of the titanium dioxide with a fluoro by putting the dried paste spreaded susbstrate into a fluoride solution for a predetermined period of time,

wherein the photodeposition method comprises:

adding chloroplatinic acid (H2PtC16) serving as a platinum precursor, and methanol serving as an electron donor to an aqueous suspension of TiO 2 ; and

irradiating the aqueous suspension of TiO 2 including the chloroplatinic acid (H2PtC16) and the methanol with ultraviolet rays, and wherein the fluoride solution is a KF solution or an HF solution.

2. The method of claim 1 ,

wherein, in the attaching of the platinum to the surface of the titanium dioxide, the platinum is attached to the surface of the titanium dioxide using a photodeposition method, and

wherein, in the producing of the surface-modified titanium dioxide, the platinum-attached titanium dioxide is put into a fluoride solution to attach the fluoro to the platinum-attached surface of the titanium dioxide.

3. The method of claim 1 ,

wherein the prepared titanium dioxide is in a powder form, and

wherein, in the attaching of the platinum to the surface of the titanium dioxide, the platinum is attached to the surface of the titanium dioxide in the powder form using a photodeposition method.

4. The method of claim 3 , further comprising the steps of:

mixing the platinum-attached titanium dioxide in the powder form with a volatile solvent to prepare a paste; and

spreading the paste on a substrate and then drying the substrate,

wherein, in the producing of the surface-modified titanium dioxide, the dried substrate is put into a fluoride solution.

5. The method of claim 1 , further comprising manufacturing the produced surface-modified titanium dioxide into a bead shape.

6. The method of claim 1 , further comprising coating a porous material with the obtained surface-modified titanium dioxide.