Abstract: Provided is a photocatalytic coating in which the coating per se is hardly eroded even when a photocatalyst is excited and a coating surface having strong hydrophobic tendency can be formed. The photocatalytic coating is prepared by dispersing or dissolving at least a photocatalyst, a tetrafluoro-ethylene-based resin obtained by graft polymerization of a sulfonic acid, a compound containing metal ion having an ionic radius not less than an ionic radius of calcium and/or complex ion having an ionic radius not less than the ionic radius of calcium into a solvent. Further, hydroxide is used as the compound containing the metal ion or an electrically neutral surfactant is added to the photocatalytic coating.

Abstract: Provided are: novel rutile titanium dioxide nanoparticles each having a high photocatalytic activity; a photocatalyst including the rutile titanium dioxide nanoparticles; and a method for oxidizing an organic compound using the photocatalyst. The rutile titanium dioxide nanoparticles each have an exposed crystal face (001). The rutile titanium oxide nanoparticles may be produced by subjecting a titanium compound to a hydrothermal treatment in an aqueous medium in the presence of a hydrophilic polymer. A polyvinylpyrrolidone, for example, is used as the hydrophilic polymer. An organic compound having an oxidizable moiety can be oxidized with molecular oxygen or a peroxide under photoirradiation in the presence of the photocatalyst including the rutile titanium oxide nanoparticles.

Abstract: Provided is a photocatalytic coating in which the coating per se is hardly eroded even when a photocatalyst is excited and a coating surface having strong hydrophobic tendency can be formed. The photocatalytic coating is prepared by dispersing or dissolving at least a photocatalyst, a tetrafluoro-ethylene-based resin obtained by graft polymerization of a sulfonic acid, a compound containing metal ion having an ionic radius not less than an ionic radius of calcium and/or complex ion having an ionic radius not less than the ionic radius of calcium into a solvent. Further, hydroxide is used as the compound containing the metal ion or an electrically neutral surfactant is added to the photocatalytic coating.

Abstract: Provided are: novel rutile titanium dioxide nanoparticles each having a high photocatalytic activity; a photocatalyst including the rutile titanium dioxide nanoparticles; and a method for oxidizing an organic compound using the photocatalyst. The rutile titanium dioxide nanoparticles each have an exposed crystal face (001). The rutile titanium oxide nanoparticles may be produced by subjecting a titanium compound to a hydrothermal treatment in an aqueous medium in the presence of a hydrophilic polymer. A polyvinylpyrrolidone, for example, is used as the hydrophilic polymer. An organic compound having an oxidizable moiety can be oxidized with molecular oxygen or a peroxide under photoirradiation in the presence of the photocatalyst including the rutile titanium oxide nanoparticles.

Abstract: A titanium oxide photocatalyst obtained by hydrolyzing or neutralizing with an alkali an aqueous solution of titanium chloride to obtain a solid component, incorporating sulfur or a sulfur-containing compound in any step of the process, and baking the solid containing the sulfur or sulfur-containing compound. The titanium oxide photocatalyst can be efficiently produced in an industrial production scale and has a high photocatalytic activity in a visible-light region.