ZnS photocatalyst for hydrogen production, preparation therefor and method for producing hydrogen by use of the same

摘要

The present invention relates to a novel photocatalyst, to preparing the photocatalyst and to a method for producing hydrogen in the presence of the photocatalyst. The novel photocatalyst of this present invention is characterized by the following formula IV: Pt(x)/ZnÄM(y)ÜS wherein "x" represents a percentage by weight of Pt in the photocatalyst ranging from 0.05 to 2.50; "M" is a promoter selected from the group consisting of V, Cr, Mo, Mn, Re, Ru, Os, Rh, Ir, Cu, Al and Ga; and "y" represents a mole % of M/(M+Zn) ranging from 0.01 to 20.00. The method for preparing the photocatalyst comprises the steps of: dissolving Zn-containing and M-containing compounds in water in such a way that M/(M+Zn) ranges, in mole %, from 0.01 to 20.00; adding H2S or Na2S as a reactant in the solution with stirring to precipitate ZnÄMÜS; washing the precipitate with water until pH reaches 7 and vacuum-drying the precipitate in a nitrogen(stream) atmosphere; adding Pt-containing compound to this precipitate in such a way that Pt ranges, in percentage by weight, from 0.05 to 2.50; illuminating the platinum-enhanced precipitate with ultraviolet light in a nitrogen atmosphere; washing the Pt-impregnated ZnÄMÜS thus obtained with water until the wash water pH reaches 7; vacuum-drying and then oxidation sintering the dried precipitate at from 280 to 420 DEG C for 1 to 3 hours, reduction sintering at the previously-sintered product at from 280 to 420 DEG C for from 1 to 3 hours.