Abstract
AbstractZnO/NiO nanoparticles supported on ordered mesoporous alumina (OMA) have been prepared by supercritical carbon dioxide impregnation using Zn(NO3)2 ⋅ 6H2O and Ni(NO3)2 ⋅ 6H2O as the precursors, supercritical carbon dioxide as the solvent and methanol as the co‐solvent. The ordered mesostructures of OMA were well‐maintained during the preparation. Ordered mesoporous alumina was prepared via solvent evaporation self‐assembly. The photocatalytic performance of ZnO/NiO/OMA composites for degradation of Congo Red was studied under simulated sunlight irradiation. The results showed that photocatalytic activity of the ZnO/NiO/OMA prepared by supercritical carbon dioxide impregnation was superior to those of commercial P‐25 and the composites prepared via the incipient wetness impregnation. The removal rate of Congo Red was found to be dependent on both the microstructure of the prepared ZnO/NiO/OMA composites and also the molar ratio of ZnO/NiO nanoparticles in OMA. The optimal molar ratio of ZnO/NiO was investigated to achieve a maximum photocatalytic activity.
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