Abstract
The degradation of ibuprofen (IBP) in aqueous solution was investigated on α-(Cu,Fe)2O3 catalyst under visible irradiation. The material was prepared by a hydrothermal method and characterized by X-ray diffraction, Fourier transform infrared, BET analysis, electrical conductivity, diffuse reflectance and photo-electrochemistry. α-(Cu,Fe)2O3 crystallizes in the corundum structure and exhibit n-type conductivity with activation energy of 0.41 eV. It exhibits a direct optical transition at 2.02 eV; further transitions, indirectly allowed, occur at 1.93 and 1.69 eV. These bands located between those of CuO (~1.46 eV) and Fe2O3 (~2 eV) confirm the presence of the solid solution (Cu,Fe)2O3; the BET surface area of the sample averages 10 m2 g−1. The IBP photo-degradation, monitored by high performance liquid chromatography was found to have overall high conversion rates. The optimal performance was observed for a catalyst dose of 0.25 g L−1 and IBP concentration of 200 mg L−1 at pH ~11. By applying the optimal operating conditions, IBP conversion of 88% was obtained after 240 min under visible illumination.
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