V 5+ -doped Ag/AgCl photocatalysts were prepared via the ion exchange method. The catalysts were characterized using X-ray diffractometry, transmission electron microscopy, and energy-dispersive X-ray, X-ray photoelectron, Fourier transform infrared and ultraviolet-visible spectroscopies. The V 5+doped Ag/AgCl photocatalysts show much higher photocatalytic activities than Ag/AgCl under visible light irradiation for methyl orange (MO) decomposition.Especially, the 2.0 wt% V 5+ -doped Ag/AgCl photocatalyst shows the highest photocatalytic activity and also high stability after five cycles. The MO degradation rate during each cycle is almost maintained at 97%. Electron spin resonance spectroscopy and radical trapping experiments reveal that holes play an important role in the photocatalytic process. KEYWORDS enhanced mechanism, photocatalyst, V 5+ -doped Ag/AgCl
Pb (PO ) /Ag PO photocatalysts with different amounts of Pb (PO ) were successfully synthesised by the ion exchange method. The catalysts were characterized by X-ray diffractometry (XRD), High-resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), Brunauer- Emmett-Teller (BET), Fourier transform infrared spectrometry (FT-IS), and ultraviolet-visible (UV-vis) spectroscopy. All Pb (PO ) /Ag PO photocatalysts show much higher photocatalytic activities than pure Ag PO under visible light irradiation in the methyl-orange (MO) decomposition. Especially, the 3.0 wt% Pb (PO ) /Ag PO photocatalyst shows the highest photoactivity and also high stability after five cycles. The MO degradation rate during each cycle is almost maintained at 97%. Photo-electrochemical measurement of photocatalysts verified that the enhancing photocatalytic activity was resulted from the electron-hole pair high separation. The photocatalytic activity enhancement of Pb (PO ) /Ag PO is closely related to ·OH, the main active oxygen species.
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