PHOTOCATALYST, PRODUCTION METHOD THEREOF, AND CLEANING DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a photocatalyst which can absorb visible light satisfactorily and exhibits high photocatalytic activity.SOLUTION: The photocatalyst includes a photocatalyst part comprising a semiconductor having 2.0 or higher refractive index and a plurality of metal nanoparticles each of which contacts with the semiconductor and is formed to be encircled by the semiconductor. The photocatalyst is characterized in that 50% or more of metal atoms in the photocatalyst, each of which constitutes the metal nanoparticle, are distributed in a zone being at the depth of 25 nm or longer from the surface of the photocatalyst part.