Self-Etching Reconstruction of Hierarchically Mesoporous F-TiO_2 Hollow Microspherical Photocatalyst for Concurrent Membrane Water Purifications

摘要

Hollow spherical metal oxides consisting of tailored nanobuilding units have recently attracted increasing attention in the fields of catalysis, adsorption, microreactors, and drug delivery. This structural diversity at nano- and microscale leads to an array of unique physicochemical properties. A considerable fraction of this research has been devoted to TiO_2. Recent progress shows that hollow TiO_2 spheres present enhanced performance in photoca-talysis and photovaltaics due to their light scattering, organic adsorption, and porous characteristics. Hollow TiO_2 nanospheres in the 0.1 -0.6 μm diameter range have been produced by template-free one-pot synthesis under hydrofhermal conditions. An Ostwald ripening mechanism has been proposed for these hollow nanospheres, and their photocatalytic property has been confirmed through removal of organic pollutants.