Three-dimensionally ordered mesoporous FeO (meso-FeO) and its supported Au, Pd, and Au-Pd alloy (xAuPd/meso-FeO; x=0.08-0.72wt.%; Pd/Au molar ratio (y)=1.48-1.85) photocatalysts have been prepared via the KIT-6-templating and polyvinyl alcohol-protected reduction routes, respectively. Physical properties of the samples were characterized, and their photocatalytic activities were evaluated for the photocatalytic oxidation of acetone in the presence of a small amount of HO under visible-light illumination. It was found that the meso-FeO was rhombohedral in crystal structure. The as-obtained samples displayed a high surface area of 111.0-140.8m/g and a bandgap energy of 1.98-2.12eV. The Au, Pd and/or Au-Pd alloy nanoparticles (NPs) with a size of 3-4nm were uniformly dispersed on the surface of the meso-FeO support. The 0.72wt.% AuPd/meso-FeO sample performed the best in the presence of 0.06mol/L HO aqueous solution, showing a 100% acetone conversion within 4hr of visible-light illumination. It was concluded that the good performance of 0.72wt.% AuPd/meso-FeO for photocatalytic acetone oxidation was associated with its ordered mesoporous structure, high adsorbed oxygen species concentration, plasmonic resonance effect between AuPd NPs and meso-FeO, and effective separation of the photogenerated charge carriers. In addition, the introduction of HO and the involvement of the photo-Fenton process also played important roles in enhancing the photocatalytic activity of 0.72wt.% AuPd/meso-FeO.
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