Apparatus for photocatalytic reaction with and method for fixing photocatalyst

摘要

A first object is to provide an apparatus for photocatalytic reaction with high treating efficiency and treatment ability that is not degraded with an elapse of operating time and a second object is to provide a method for simply and efficiently immobilizing a photocatalyst on a support. The first invention is to immobilize (coat) a photocatalyst on a surface of a support, continuously supply solution to be treated in atmosphere in thin film shape on the surface of the immobilized photocatalyst, and irradiate the photocatalyst surface with light for causing photocatalytic reaction to occur. A second invention is a method for immobilizing a photocatalyst on a support by using alkali metal silicate as a binding agent, comprising: a first step for coating and immobilizing an aqueous solution of the alkali metal silicate on the support; a second step for coating and immobilizing a powdered photocatalyst on the alkali metal silicate after the first step; and a third step for curing the coated and immobilized photocatalyst after the second step.