Abstract
Three-dimensionally interconnected meso/mesoporous holmium doped titania nanoparticles had been successfully prepared by a sol-gel routine. The precursors were prepared by cohydrolysis reactions of Ti(OC2H5)4/Ho(OC2H5)6 coprecipitating around micells of cetyltrimethylammonium bromide processed by ultrasonic. The hierarchical meso/mesoporous material was proved by high resolution transmission electron microscopy and N2 adsorption-desorption analysis. The results of selecting area electron diffraction pattern, Raman spectroscopy, and X-ray diffractometry in wide-angle range showed a crystal phase of anatase for the prepared material. The XPS spectroscopy analysis showed that Ti element exists in the Ti4+ form and the bonds of Ti-O-Ho/H and Ti-O-Ti exist in the surface of Ho3+ doped TiO2. Phenol photodegradation in an aqueous medium was employed as a probe reaction to evaluate the photocatalytic reactivity of the catalyst. The catalyst which possessed a hierarchical meso/mesoporous structure being conducive mass-transferring and light-harvesting showed that a photocatalytic activity for phenol is about 3.3 times than that of commercial P25 titania under a very weak UV-Vis irradiation condition.
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