Abstract
A new visible-light-driven photocatalyst was developed in a vanadate garnet Ca5Ni4(VO4)6. The particles were prepared by a modified Pechini method. The sample was characterized with measurements such as x-ray powder diffraction, scanning electron microscope, and UV–vis absorption spectrum. The photocatalytic activities of Ca5Ni4(VO4)6 particles were evaluated by photodegradation of methylene blue under visible-light irradiation in air. Ca5Ni4(VO4)6 shows photocatalytic activity due to an efficient absorption in the UV–visible light wavelength region with a narrowed band gap energy of 2.13 eV and an indirectly allowed electronic transition. These results indicate that this vanadate garnet could be a potential photocatalyst driven by visible-light. The effective photocatalytic activity was discussed on the base of the crystal structure, the photoluminescence and the decay lifetime. The photocatalytic ability of Ca5Ni4(VO4)6 is related to structure characteristics such as the regular and isolated VO4 tetrahedron, the optical centers of Ni–O octahedron, the low opportunity for the recombination of electron–hole pairs in the lattices.
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