Effect of Ni substitution on the structure and photocatalytic activity of InTaO_4 under visible light irradiation

摘要

The effect of Ni substitution on the structure and photocatalytic H_2 and O_2 evolutions of InTaO_4 under visible light irradiation (lambda > 420 nm) from aqueous CH_3OH/H_2O and AgNO_3/H_2O solutions were investigated. The photocatalysts were prepared by the solid-state reaction method and characterized by powder x-ray diffraction and Rietveld structure refinement. These photocatalysts crystallize in the same wolframite structure, but lattice parameters decrease with increase of x in In_(1-x)Ni_xTaO_4 (0 <= x <= 0.2). The photocatalytic activity changed with the variation of x in In_(1-x)Ni_xTaO_4 and the photocatalyst at x = 0.1 showed the highest activity, which increased 8 times compared with nonsubstituted photocatalyst.