Visible-light-responsive photocatalyst with environmental resistance

摘要

To provide a novel visible light-responsive photocatalyst or tungsten oxide visible light-responsive semiconductor improved in environmental resistance under an alkaline condition. The tungsten oxide visible light-responsive semiconductor unstable under an alkaline condition is improved in environmental resistance without losing photocatalytic function thereof by adding thereto at least one element selected from the group consisting of copper, tantalum, niobium, lanthanum, bismuth, calcium, chromium, manganese and zinc. The obtained environmental resistant visible light-responsive photocatalyst is subjected to an alkaline treatment to thereby be improved in photocatalytic activity.

主权项

1. A method for improving environmental resistance of tungsten oxide under an alkaline condition without losing photocatalytic function thereof caused by visible light, the method comprising one of the following combinations:
(a) impregnating a tungsten oxide powder with a metal coating solution of at least one element to form a powder sample, and
burning the powder sample; or (b) applying a metal coating solution of at least one element to a tungsten oxide thin film to form a coated film, and
burning the coated film to form a tungsten oxide photocatalyst; andwherein the at least one element is at least one selected from the group consisting of lanthanum, bismuth, and calcium, and immersing the tungsten oxide photocatalyst in an alkaline aqueous solution for a predetermined time after burning.