AuSrTiO 3 nanocomposites were prepared using a photocatalytic reduction method by which the Au nanoparticles with particle size of 726 nm were deposited on the surface of SrTiO 3 particles with an average diameter of ³55 nm. The structure, morphology and optical properties of products were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, Transmission electron microscopy and UVvisible diffuse reflectance spectroscopy. It is found that the loaded Au nanoparticles on SrTiO 3 particles exist in the metallic state, and the surface plasmon resonance absorption band centered around 557 nm is obviously detected in the diffuse reflectance spectra of AuSrTiO 3 nanocomposites. The photocatalytic activities of samples toward the degradation of dyes (acid orange 7 and methyl orange) were evaluated under simulated sunlight and visible light irradiation. The results indicate that the decoration of Au nanoparticles can effectively improve the photocatalytic activity of SrTiO 3 , and the catalytic efficiency of composites is related to the content of Au. More importantly, the AuSrTiO 3 nanocomposites exhibit much higher photocatalytic activity under simulated sunlight than under visible light. In addition, a possible promotion mechanism of Au nanoparticles on the photocatalytic activity of SrTiO 3 was proposed.
Bi 2 Fe 4 O 9 nanoplatelets were successfully prepared via hydrothermal method using KOH as the mineralizer. The in uence of KOH concentration on the morphology of the products was investigated. It is found that the thickness and edge length of as-prepared Bi 2 Fe 4 O 9 nanoplatelets can be tailored by adjusting the KOH concentration. With increase in the KOH concentration from 3 to 9 M, the thickness of nanoplatelets increases gradually, whereas their edge length exhibits a trend of decrease. A possible in uencing mechanism of the KOH concentration on the morphology of Bi 2 Fe 4 O 9 nanoplatelets is proposed on the basis of experimental results. The photocatalytic activity of Bi 2 Fe 4 O 9 nanoplatelets was investigated by the degradation of methylene blue under simulated sunlight irradiation, indicating that they possess an appreciable photocatalytic activity. Furthermore, the as-prepared Bi 2 Fe 4 O 9 nanoplatelets present good photocatalytic reusability. Magnetic hysteresis loop measurement shows that the Bi 2 Fe 4 O 9 nanoplatelets exhibit weak ferromagnetic behavior at room temperature.
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