| abstract |
(57) [Abstract] [PROBLEMS] To provide a method for decomposing water by using a titanium oxide having a layered structure and its derivative as a photocatalyst. [Structure] (1) Composition formula [Chemical formula 1] (However, A is Na, K, Rb, Cs, n = 2, 3, 4 or 5 and m is 0-4), or a titanium oxide crystal or powder having a layered structure, (2) Composition formula [Chemical formula 2] (However, x is 0.65 to 0.75, m is 0 to 4, and □ are holes), a crystal or powder of titanium oxide having a layered structure of an urocoyrite type, (3) or these Substances obtained by substituting a part or all of the interlayer cations of the compound with hydrogen ions, ammonium ions or other metal ions or organic substances by an ion exchange method, (4) or transition metals (Ni, Pt, Ru, Pd) Etc.) or an oxide thereof is dispersed as a catalyst in an aqueous solution containing water or a salt or a mixed system of water and an organic solvent, and the wavelength is 800 nm. By irradiating with the following light, hydrogen, oxygen, or both are obtained. |