摘要：A novel plasmonic Ag/AgCl/KTaO3 photocatalysts were synthesised by deposition-precipitation and photoreduction methods. The crystal structures and morphology of the Ag/AgCl/KTaO3 photocatalysts were characterized by X-ray diffraction, scanning electron microscopy and transmission electron microscopy. The composition of the photocatalysts was studied by X-ray photoelectron spectroscopy and energy-dispersive X-ray spectroscope. The photocatalytic properties were examined through the decomposition of methyl orange and methylene blue aqueous solution under visible light irradiation. Compared to the pure KTaO3 and Ag/AgCl, the Ag/AgCl/KTaO3 photocatalysts have better photocatalytic activities. We measured the UV-vis diffuse reflectance spectroscopy and photoluminescence of the photocatalysts verified that the Ag/AgCl/KTaO3 photocatalysts could absorb the visible light and the electron-hole pairs have high separation which enhanced the photocatalytic activity. Additionally, electron spin resonance experiment was used to measure the main reactive species in the photocatalytic process. Based on above, a photocatalytic mechanism for organics dyes degradation over Ag/AgCl/KTaO3 was proposed. The results for degradation of dyes show that the Ag/AgCl/KTaO3 photocatalysts were efficient and friendly for environment.
