Abstract
Nanocrystalline La 1− x Fe x VO 4 ( x = 0, 0.05, 0.10, 0.20) solid solution powders were successfully synthesized via a low-temperature molten salt method. The products were characterized using powder X-ray diffraction (XRD), transmission electron microscopy (TEM). The results show a gradual phase transformation from monoclinic to tetragonal-phase with the increase of x value, accompanied by a remarkable morphology variation from nearly spherical nanoparticles to nanorods, nanosheets. Fe 3+ doped LaVO 4 can be fully stabilized in tetragonal-phase at x = 0.20, whereas only a monoclinic-phase can be obtained without adding Fe 3+. The followed photocatalytic degradation data present that the metastable tetragonal-phase exhibits higher photocatalytic activity than the monoclinic.
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