In Situ Photoactivated Plasmonic Ag3PO4@silver as a Stable Catalyst With Enhanced Photocatalytic Activity Under Visible Light

AUTOR(ES)
FONTE

Mat. Res.

DATA DE PUBLICAÇÃO

03/04/2017

RESUMO

Silver orthophosphate (Ag3PO4) had been reported as an excellent candidate to split water or decompose pollutants with high efficiency in visible light region, yet is not stable due to the reduction of silver ion. In this work, an easy-fabricated method (in situ photoinduced reduction) was provided to enhance the stability of Ag3PO4 for its possible application as a visible-light sensitive photocatalyst. The as-prepared samples were characterized by X-ray diffraction (XRD), UV-vis diffuse reflectance spectra, photoluminescence spectra (PL) and Photoelectrochemical measurements. The Ag3PO4/Ag photocatalysts showed strong photocatalytic activity for decomposition of RhB dye or phenol-X-3B mixture under visible light irradiation (λ> 420 nm) and can be used repeatedly. The possible mechanism for the enhanced photocatalytic properties of the Ag3PO4/Ag hybrid was also discussed. It was found that •OH and holes take priority over •O2- radicals in serving as the main oxidant in the Ag3PO4/Ag photocatalytic system. Especially, the experimental results indicate that the surface plasmon resonance of Ag nanoparticles and a large negative charge of PO43- ions as well as high separation efficiency of e--h+ pairs, facilitated the enhancement of the photocatalytic activity of the Ag3PO4/Ag composite. The results indicated that Ag3PO4/Ag is an efficient and stable visible-light-driven photocatalyst.

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