Method for producing photocatalyst and photocatalyst filter for air cleaning

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

• preparing titanium dioxide (TiO2);
• 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 TiO2;
• and
• irradiating the aqueous suspension of TiO2 including the chloroplatinic acid (H2PtC16) and the methanol with ultraviolet rays, and wherein the fluoride solution is a KF solution or an HF solution.