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Application of a metal ion-implantation for the preparation of visible-light sensitive zeolite photocatalyst: V ion-implanted Ti-containing HMS mesoporous molecular sieves

Visible light sensitive zeolite photocatalysts have been prepared by metal ion-implantation of Ti-containing mesoporous molecular sieves with V ions (V/Ti-HMS) which can operate under visible light irradiation (λ > 450 nm). The metal ion-implantation with V ions was effective to shift the absorption band of Ti-containing molecular sieves to longer wavelengths. This V/Ti-HMS performed the photocatalytic reactions for the NO decomposition under visible light irradiation, while no reaction proceeded on the original Ti-HMS. XAFS analysis indicated that implanted V-oxide moieties existed having tetrahedral coordination and interacted with the tetrahedrally coordinated titanium oxide moieties. These XAFS results as well as the analysis with UV-VIS absorption measurements indicate that the charge transfer excited state of the tetrahedrally coordinated titanium oxide moieties interacting with the tetrahedrally coordinated vanadium oxide moieties plays a significant role in the photocatalytic reaction under visible light irradiation.