Abstract
A novel plasmonic photocatalysts of Ag@CdSe/Al2TiO5 was successfully prepared via a simple and mild wet-chemical process. The physical and photophysical properties of the as-prepared Ag@CdSe/Al2TiO5 samples were characterized by scanning electron microscopy (SEM), transmission electron microscope (TEM), Ultraviolet–visible diffuse reflection spectroscopy (DRS), photoluminescence emission spectra (PL) and electrochemical impedance spectroscopy (EIS). The interaction between Ag@CdSe and Al2TiO5 has been characterized by X-ray photoelectron spectroscopy (XPS) analysis, and which is facile to the electron transfer between Ag@CdSe and Al2TiO5 and enhancing photocatalytic performance of Ag@CdSe/Al2TiO5 composite photocatalyst. The photocatalytic experiments demonstrat that the Ag@CdSe species can efficiently improve the separation efficiency of photoinducing electrons and holes and consequently improve the methylene blue (MB) photodegradation activity. The 20 wt% Ag@CdSe/Al2TiO5 sample exhibit the most superior photocatalytic activity. A possible photocatalytic mechanism of MB over Ag@CdSe/Al2TiO5 is proposed, which can be attributed the success to the surface plasmon resonance (SPR) effect from Ag/AgCl species.
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