Patent ID: 8017542

Claim:
A production method of a doped titanium oxide which is doped at least with carbon atoms and nitrogen atoms, the production method comprising the steps of; (1) dispersing or dissolving basic polymer (x) having amino group(s) in aqueous medium, (II) obtaining a layered structure composite of polymer/titanium oxide wherein basic polymer (x) having amino group(s) is inserted among titanium oxide by mixing aqueous dispersion or aqueous solution obtained in (I) and water-soluble titanium compound (z) in aqueous medium, and by producing a hydrolytic reaction at a temperature of 50° C. or less, (III) doping with carbon atoms and nitrogen atoms in basic polymer (x) having amino group(s) to titanium oxide, by burning with heat the layered structure composite thus obtaining the doped titanium oxide with a crystalline surface.