▎ 摘　　要

NOVELTY - Photocatalytic composite particle comprises strontium titanate. A electron donors and electron acceptors are supported on the surface of the strontium titanate. The strontium titanate comprises single crystal particles of strontium titanate of octahedron, dodecahedron or regular hexahedron. USE - The particle is useful for photocatalytic film in water treatment (claimed). ADVANTAGE - The method is simple and greatly improves the degradation efficiency of photocatalysis. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) preparing photocatalytic composite particles comprising (i) mixing a strontium titanate dispersion, an electron donor salt solution and an electron acceptor salt solution, and stirring under ultraviolet light irradiation to obtain a reaction product, and ((ii) drying and heating the reaction product in sequence to obtain photocatalytic composite particles; and (2) photocatalytic film.