Visible-light photocatalyst particles and method for manufacturing same
AssigneeToto Ltd.
InventorsHiromasa Tokudome, Sayuri Okunaka
Life of this patent
Estimating the term…
Abstract
Disclosed is a visible light responsive photocatalyst that simultaneously realizes high crystallinity and refinement of primary particles. Also disclosed is a photocatalyst composed of secondary particles that have a high porosity and are aggregates of fine primary particles. Rhodium-doped strontium titanate that is a visible light responsive photocatalyst of the present invention has a primary particle diameter of not more than 70 nm and has a absorbance at a wavelength of 570 nm of not less than 0.6 and a absorbance at a wavelength of 1800 nm of not more than 0.7, each absorbance determining by measuring a diffuse reflection spectrum, the rhodium-doped strontium titanate having a high water-splitting activity as a photocatalyst.
Claims11
Rhodium-doped strontium titanate particles having a primary particle diameter of not more than 70 nm and having
- an absorbance at a wavelength of 570 nm of not less than 0.6 and
- an absorbance at a wavelength of 1800 nm of not more than 0.7,
- each absorbance being determined by measuring a diffuse reflection spectrum, and
- a molar ratio represented by M (rhodium)/M (titanium+rhodium) of 0.001 to 0.03.
A process for producing the rhodium-doped strontium titanate particles having a primary particle diameter of not more than 70 nm and having an absorbance at a wavelength of 570 nm of not less than 0.6 and an absorbance at a wavelength of 1800 nm of not more than 0.7, each absorbance being determined by measuring a diffuse reflection spectrum, comprising:
- providing a solution of a titanium compound, a rhodium compound, a strontium compound, and a hydrophobic complexing agent dissolved in water;
- and drying the solution to obtain a residue and firing the residue.
Dependencies are inferred from the claim text.