Synthesis of nanoporous graphite-derived carbon/TiO2–SiO2 composites by a mechanochemical intercalation method

✍ Scribed by Y.-H. Chu; M. Yamagishi; Z.-M. Wang; H. Kanoh; T. Hirotsu

• Publisher: Elsevier Science
• Year: 2009
• Tongue: English
• Weight: 876 KB
• Volume: 118
• Category: Article
• ISSN: 1387-1811
• DOI: 10.1016/j.micromeso.2008.09.036

✦ Synopsis

Nanoporous composites of carbon nanosheets and single or mixed TiO 2 and SiO 2 were synthesized from graphite oxide (GO) precursor by a mechanochemical intercalation (MCI) method and their structural and adsorption/photocatalytic properties examined. It was found that a mixed Ti and Si organic phase behaves differently from a single phase in the MCI process, with linkages of SiO 2 and TiO 2 forming between the carbon layers, leading to an intercalation structure with improved surface hydrophilicity and a composite with enhanced microporosity and a reduced total amount of oxides. Although structural regularity of intercalated GO becomes poorer by applying Ti species in the MCI method, carbon-mixed oxide composites with an appropriate pore structure and sufficient Ti content exhibit a synergy effect of adsorption concentration and photocatalysis toward organic molecules.