Production processes are provided which can produce, at a relatively low temperature and in a reduced number of steps,
anatase titanium oxide powder having high photocatalytic activity and large specific surface area and
anatase titanium oxide slurry having high storage stability and dispersibility. The
slurry thus obtained can also be coated, as a
coating material having photocatalytic activity, on materials having low
heat resistance. In the production process of
anatase titanium oxide powder according to the present invention, a titania
sol solution, a titania gel, or a titania
sol-gel mixture is
heat treated in a closed vessel under pressure, and the treated product is then dried to produce anatase
titanium oxide powder. In the production process of anatase
titanium oxide slurry according to the present invention, a titania
sol solution, a titania gel, or a titania sol-gel mixture is
heat treated in a closed vessel under pressure, and the treated product is then dispersed / stirred to produce anatase
titanium oxide slurry.