Visible light responsive photocatalyst-rare earth compound using the same and method for producing h

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PROBLEM TO BE SOLVED : To obtain a photocatalyst capable of utilizing not only an ultraviolet region but also a visible light region, a means for forming and manufacturing hydrogen by using this photocatalyst in the decomposition of water, or the like, and a harmful substance detoxifying treatment means using the photocatalyst in the decomposition treatment of a harmful substance. SOLUTION : As a photocatalytic component, a vanadium (V)-containing composite oxide semiconductor represented by the formula : RVO4(wherein, R is a Y element or a lanthanide element) is used. COPYRIGHT : (C)2003, JPO