In this work, we report synthesis of chromium substituted manganese ferrites nanoparticles by using sol-gel autocombustion method. The phase formation of MnFe2-xCrxO4 (0 ≤ x ≤ 2.0) nanoparticles were identified by X-ray powder diffraction (XRD). Fourier transform infrared spectroscopy (FT-IR) and UV-VIS-NIR spectroscopy was used for photocatalytic study. The photocatalytic activity of the as-prepared ferrospinels was evaluated by degradation of the flouoroscein dye Rose Bengal under irradiation of visible light. The results showed that the increase in concentration of Cr in manganese ferrite increases photocatalytic activity efficiency towards degradation of Rose Bengal solution. This may be attributed to decrease in crystallite size with substitution of Fe+3 by Cr+3 ions
