To obtain a photocatalytic coating having excellent photocatalyst dispersion stability by adding titanium dioxide having a Raman spectrum peak in a specific range and containing anatase type titanium dioxide in a large amount and a silica sol to a solvent.
This photocatalytic coating is obtained by adding (A) titanium dioxide having a Raman spectrum peak in a range of 146-150 cm-1 containing anatage type titanium dioxide in an amount of ≥95 wt.%, and preferably having an average particle diameter of ≤200 nm, and (B) a silica sol preferably having an average particle diameter of ≤200 nm to a solvent, such as a water-alcohol mixture having a water: alcohol ratio of 20:80 to 70:30. The photocatalyst coating is coated on a substrate and subsequently dried at 200-450°C to produce the photocatalyst-carrying substrate wherein the titanium dioxide of photocatalyst is adhered to the substrate with the silica sol of binder. The photocatalyst-carrying substrate can be used for deodorizing stinky gases, purifying supply water, drainage, industrial liquid wastes, etc.
SHIN MIKIO
JO KUNITAKA
