Vanadyl sulfate n-hydrate (0.04 mol) and Indium (Ⅲ) nitrate n-hydrate (0.04 mol) were dissolved into 100 cm 3 three different solvents. The solutions were refluxed at 70℃ for 20 h under N2 gass flowing. And a solvent was evaporated by rotary vacuum evaporator. Thus obtained Indium vanadate precursor powder was calcined at 650℃in air for 2 h. The resultant powder was then characterized by powder x-ray diffraction (XRD), scanning electron microscopy (SEM) and BELSORP Mini porosimeter.

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... ic activity of InVO4 was evaluated from measurements of decomposition of methylene blue under irradiation of fluorescent light and black light, i.e. 50 cm 3 methylene blue solution with 0.10g photocatalyst was used for the experiments at room temperature. The solutions were exposed to fluorescent light or black light for various times between 30 min. and 480min. And concentration of methylene blue of the solution was measured by the absorptiometry.