Alkaline earth ferrites AFe2O4 (A = Ba, Ca and Sr) were synthesized by sol–gel method.
Visible light photocatalytic activity of these ferrites were studied using congo red dye degradation.
BaFe2O4 exhibited the best photocatalytic activity under visible light (xenon lamp) irradiation; CaFe2O4 was the best photocatalyst under natural sun light irradiation.