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The mixed metal oxides NiFe 2 O 4  and Zn 0.5 Ni 0.5 Fe 2 O 4  with a spinel-like structure, pure and modified with the lanthanide ions Eu(III) and Tb(III), were prepared by a sol-gel process in which propylene oxide was used as a gelling agent and then tested as photocatalysts. The photocatalytic activity was studied under polychromic visible light irradiation (halogen lamp) for the decomposition of the water pollutant Malachite Green in model solutions which were prepared under laboratory conditions. The modified samples showed a better activity under visible light irradiation than the pure samples. The highest activity under visible light irradiation was observed for Zn 0.5 Ni 0.5 Fe 2 O 4  that was modified with 5 wt. % Eu(III) or Tb(III), and which showed the positive effects of the doping ions. Based on the cartographic data for the smooth and equal distribution of Tb(III) on the surface of Zn 0.5 Ni 0.5 Fe 2 O 4  particles, the surface processes may have influenced the photocatalytic activity. The energy band gap of the samples was calculated, showing somewhat lower values for the doped samples than the pure ferrites.

Photocatalytic activity of NiFe 2 O 4 and Zn 0.5 Ni 0.5 Fe 2 O 4 modified by Eu(III) and Tb(III) for decomposition of Malachite Green