Patent ID: 7846864
Filing Date: 2010-12-07
Classification: B01D,B01J,Y02W

Abstract:
1. A method for preparing a photocatalyst material comprising the sequential steps of: (a) forming a mixture of a first-metal precursor and a second-metal precursor in a predetermined molar ratio of said second-metal relative to said first-metal, wherein said first-metal is a metal that exhibits photo-induced semiconductor properties and said second-metal is a dopant selected from the group consisting of tungsten (W), vanadium (V), and alloys and combinations thereof; (b) dialyzing the mixture of first-metal precursor and second-metal precursor to remove nonessential ion(s) from the mixture thereby to form a preliminary product comprising an oxide of the first-metal having ions of the second-metal dispersed therethrough; (c) drying the preliminary product to form a dried first-metal oxide product doped with ions of said second-metal, said dried product comprising very small particles; and, (d) calcinating the dried first-metal oxide product by applying heat to form the photocatalyst material.