Cu2+ doped layered hydrogen titanate was prepared by the calcination of K2CO3, TiO2 and CuO mixtures with the K2CO3:TiO2:CuO molar ratio of 1:2.5(1-x):2.5x at 1200°C for 5 h followed by an ion-exchange reaction in 1 M HCl solution. The crystalline phase changed from monoclinic hydrogen tetratitanate to an orthorhombic lepidocrocite-type hydrogen titanate by increasing the amount of Cu2+ doped. Both compounds could be excited by visible light irradiation (λ>400 nm) and were capable of hydrogen gas evolution from an aqueous methanol solution, where the photocatalytic activity of Cu2+ doped hydrogen tetratitanate was slightly greater than that of Cu2+ doped lepidocrocite-type hydrogen titanate. The photocatalytic activity of Cu2+ doped hydrogen tetratitanate was enhanced by constructing Pt and TiO2 pillars in the interlayer, and the incorporation of Pt in Cu2+ doped hydrogen tetratitanate enabled the cleavage of water into hydrogen and oxygen by irradiating visible light (λ>400 nm) without a sacrificial hole acceptor. (C) 2000 Elsevier Science Ltd.
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