AgPO/rectorite nanocomposites: Ultrasound-assisted preparation, characterization and enhancement of stability and visible-light photocatalytic activity.

To overcome the drawback of low stable brought by the transformation of Ag into Ag, a highly efficient and stable photocatalyst AgPO/rectorite composite was successfully synthesized by ultrasound-assisted precipitation method. The as-prepared samples were characterized by field-emission scanning electron microscopy, transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, N adsorption-desorption, room-temperature photoluminescence spectra, Fourier transform infrared spectrum measurements and UV-vis diffuse reflectance spectra. The absorption edges of the AgPO/rectorite display a noticeable shift to the visible light region as compared to that of the AgPO. Compared with bare AgPO, the AgPO/rectorite composite by ultrasound-assisted precipitation process exhibits significantly enhanced photocatalytic activity and stable for methyl orange (MO) degradation under visible light irradiation. The improved activity of the AgPO/rectorite photocatalyst could be attributed to the expanded visible light absorption, the enhanced interfacial charge transfer and the inhibited recombination of electron-hole pairs. Therefore, the facile ultrasound-assisted preparation process provides some insight into the application of AgPO/rectorite nanocomposites in photocatalytic degradation of organic pollutants.