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Using the co-precipitation oxidation method and metal salt precursors, pure MFe 2 O 4  (M = Co, Zn, Cu and Ni) photocatalysts were prepared co-precipitation method. The several properties of photocatalysts were studied. In sunlight and at neutral pH, all photocatalysts degraded crystal violet and performance ranking was NiFe 2 O 4  &lt; CoFe 2 O 4  &lt; CuFe2O4 &lt; ZnFe 2 O 4 . Among these photocatalysts, ZnFe 2 O 4  showed the highest photocatalytic degradation performance due to the smallest particle sizes, which were widely distributed. More channels were obtained due to the small pore volume providing a high number of active sites with optical band gap values of 1.69–2.55 eV. The photocatalytic degradation was an effect of the ratio of Zn/Fe, photocatalyst loadings, and calcination temperature. Calcination time and reaction duration were studied. The photocatalytic degradation reaction was almost completed within 24 h using Zn:Fe (1:2). The reaction followed the first-order rate constant. Photocatalysts were stable for seven times recycles.

High activity of ZnFe 2 O 4 nanoparticles for photodegradation of crystal violet dye solution in the presence of sunlight