Controlled Synthesis of Ordered Mesoporous G-TiO2 Nanocomposites with Crystalline Titania Frameworks from Organic-Inorganic-Amphiphilic Coassembly

摘要

Highly ordered mesoporous carbon-titania nanocomposites with nanocrystal-glass frameworks have been synthesized via the organic-inorganic-amphiphilic coassembly followed by the in situ crystallization technology.A soluble resol polymer was used as a carbon precursor,prehydrolyzed TiCl4 as an inorganic precursor,and triblock copolymer F127 as a template.The carbon-titania nanocomposites with controllable texture properties and composition can be obtained in a wide range from 20 to 80 wt TiO2 by adjusting the initial mass ratios.The C-TiO2 nanocomposites with"bricked-mortar"frameworks exhibit highly ordered 2D hexagonal mesostructure and high thermal stability up to 700°C.The nanocomposites have high surface area(465 m2 g~(-1))and large pore size(~4.1 nm).Additionally,the nanocomposites show good performance in degradation of Rhodamine B due to the photocatalytic activity of the titania nanocrystals and the strong adsorptive capacity of the glasslike carbon.