Photocatalysis is a promising solution for the degradation of dyes since this substance give a negative impact on the environment. In this study, Ni0.5V0.5Fe2O4 nanophotocatalyst was prepared simultaneously using sol-gel and freeze-drying methods. After the freeze-drying process, the sample was subjected to calcination treatment and subsequently characterized using the techniques of X-ray Diffraction (XRD) and Scherrer calculation method, FTIR, DR spectroscopy, and TEM analysis. The results of XRD characterization indicated that material consists of Ni0.5V0.5Fe2O4 spinel as a major crystalline phase. Then, TEM analysis proved that the grain size of this spinel is in the range of 20 nm. Crystallite size calculation using Scherrer equation proved that the size is 34.06 nm, DRS analysis indicated that bandgap energy of spinel Ni0.5V0.5Fe2O4 is suitably utilized and FTIR spectra analysis implied that the prominent acid sites are Lewis acid. Furthermore, results of dyes photodegradation indicated that Ni0.5V0.5Fe2O4 nanocatalyst is active for remazol golden yellow degradation until 45% conversion under sunlight irradiation for 100 min.

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