期刊
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
卷 242, 期 -, 页码 51-58出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jphotochem.2012.05.020
关键词
Mesoporous TiO2 microspheres; TiO2 pillars; Anatase/rutile; Tunable composition; High photoactivity
资金
- MIUR
- INSTM Consorzio
Porous TiO2 microspheres with robust texture and high photoactivity were prepared by inflowing a TiO2 precursor in the confined space of polystyrene-co-divinyl benzene (PS-co-DVB) polymer, working as sacrificial scaffold. The impregnated polymer spheres, upon thermal treatments under N-2. N-2/air or pure air flow at temperatures in the 400-500 degrees C interval, are transformed into porous microspheres. Depending on the gas flow composition, the obtained microspheres are constituted by porous carbon, hybrid core-shell C/TiO2 or of cemented TiO2 nanoparticles assembled in elongated pillars. The composition of pure TiO2 microspheres ranges from pure anatase (400 degrees C) to the prevailing rutile phase (>475-500 degrees C). All samples have been extensively characterized by means of SEM/AFM microscopes, N-2-volumetric porosimetry, XRD and UV-vis analyses. The photodegradation of NO has been used to check the photocatalytic activity of the TiO2 materials. It is concluded that they exhibit higher photoactivity than the classical benchmark material (Degussa P25). This property together with porous character of the microspheres, the tunable anatase-rutile ratio and the high crystallinity makes these microspheres very interesting materials for applications in photocatalysis. From a physical point of view, the large axial pores and the columnar nature of the spheres can produce the entrapment of the light into the material. (C) 2012 Elsevier B.V. All rights reserved.
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