Abstract
A series of visible-light-driven mesoporous structuredMnO2/TiO2 nanocrystal photocatalysts have been synthesized through a modified sol–gel method, and theN2 adsorption–desorption isotherm confirms that the mesoporous materials possess large poresize (up to 9.2 nm) and a narrow pore size distribution. X-ray powder diffraction(XRD) analyses and complementary x-ray photoelectron spectroscopy (XPS)measurements reveal that the doping of the transition metal Mn inhibits the growth ofTiO2 anatase nanocrystals and the Mn species are highly dispersed on the surface ofTiO2. The ultraviolet (UV)–vis spectrum demonstrates the excellent adsorption properties ofMnO2/TiO2 over the whole region of visible light, which enables this novel photocatalysis material topossess remarkable activity in the photocatalytic degradation of methylene blue undervisible light radiation. Moreover, a ‘coating mechanism’ based on the nucleation of titaniananocrystals along with the interaction between the dopant precursors and titania clustershas been suggested.
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