Abstract
In this research, Ag-anatase composites were synthesized through the chemical reduction method followed by calcination. The effects of calcination temperatures were studied at 400 °C (ST-4), 500 °C (ST-5), to 600 °C (ST-6). The characterization results indicated that the achieved Ag species in all of the prepared Ag-anatase composites were stable in Ag (0) which was confirmed by X-ray absorption near the edge structure (XANES) and detected by X-ray diffraction (XRD). The deposition of tiny Ag species (10–20 nm in size) on the anatase surface was observed by high resolution transmission electron microscopy (HR-TEM). The photoluminescence (PL) characterization results revealed that the recombination rate of photogenerated electron-hole pairs was significantly reduced after the deposition of Ag nanoparticles and was decreased as the calcination temperature increased. The ST-6 possessed the highest photocatalytic performance which can degrade rhodamine B (10 ppm) by using 0.05 g of the prepared composites under UV irradiation within 1 h. It could be concluded that metallic Ag nanoparticles deposited on the anatase surface induced by the calcination process can possibly play an important role in the enhancement of photocatalytic performance of bare-anatase.
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