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Key Words:Photodegradation;Azo dyes - Dyes - Electron transport properties - Energy dispersive spectroscopy - Hematite - Irradiation - Light - Mesoporous materials - Nanorods - Organic pollutants - Photocatalysis - Photocatalysts - Photoluminescence - Scanning electron microscopy - Shells (structures) - Titanium dioxide - Transmission electron microscopy - X ray powder diffraction;Core shell structure - Degradation of methyl oranges - Diffuse reflectance spectrum - Fe2O3 - Large specific surface areas - Mesoporous structures - Photoluminescence spectrum - TiO2
Abstract:An ideal photocatalyst for degradation of organic pollutants should combine the features of efficient visible light response, fast electron transport, high electron-hole separation efficiency, and large specific surface area. However, these requirements usually cannot be achieved simultaneously in the present state-of-the-art research. In this work, we develop a rational synthesis strategy for the preparation of one-dimensional (1D) mesoporous Fe<inf>2</inf>O<inf>3</inf>@TiO<inf>2</inf>core-shell composites. In this strategy, FeOOH nanorods are firstly coated by TiO<inf>2</inf>shell, followed by a calcination process. The as-prepared composites are thoroughly investigated with X-ray powder diffraction, scanning electron microscope, energy dispersive spectroscopy, transmission electron microscope, N<inf>2</inf>adsorption-desorption isotherms, UV-visible diffuse-reflectance spectra, and photoluminescence spectra. Endowed with the advantages of its composition and specific structural features, the presented sample possesses the combined advantages mentioned above, thus delivering evidently enhanced photocatalytic activity for the degradation of methyl orange under UV light irradiation and Rhodamine B under visible light irradiation. And the possible mechanism of the enhanced photocatalytic performance is proposed.<br/> © 2014 Elsevier B.V. All rights reserved.
Volume:317
Issue:
Translation or Not:no