CuBi 2 O 4 /CeO 2 nanocomposites were synthesized by the solid state method and were characterized by a number of techniques such as X-ray diffraction, scanning electron microscopy and UV–Vis diffuse reflectance spectroscopy. The photocatalytic activity of the samples was investigated under UVA light and assessed using Congo red (CR) dye as probe reaction. The efficiency of the coupled CuBi 2 O 4 /CeO 2 photocatalyst was found to be related to the amount of added CuBi 2 O 4 and to the pH medium. The CuBi 2 O 4 /CeO 2 photocatalyst exhibited the high efficiency as a result of 83.05% of degradation of CR under UVA light for 100 min of irradiation time with 30 wt% of CuBi 2 O 4 at 25 °C and pH 7, which is about 6 times higher than that of CeO 2 . The photodegradation reactions satisfactorily correlated with the pseudo-first-order kinetic model. The mechanism of the enhanced photocatalytic efficiency was explained by the heterojunction model.
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Abdelkader et al. (2014) studied this question.
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