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One-pot Synthesis Of TiO2/graphene Nanocomposites For Excellent Visible Light Photocatalysis Based On Chemical Exfoliation Method

N. N. H. Ton, A. Dao, Koichiro Kato, Takuma Ikenaga, D. Trinh, Toshiaki Taniike
Published 2018 · Materials Science

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Abstract Facile electron-hole recombination and the broad band gap are two major bottlenecks of titanium dioxide (TiO2) applied in visible-light photocatalysis. Hybridization of TiO2 with graphene is a promising strategy to alleviate these drawbacks. In this paper, we demonstrate a novel technique to synthesize TiO2/graphene nanocomposites without the use of graphene oxide (GO). Graphene dispersion was obtained through the chemical exfoliation of graphite in titanium tetra-n-butoxide by ultrasonication. The dispersion was directly used for the sol-gel reaction in the presence of different catalysts, affording TiO2/graphene nanocomposites featured with several advantages: i) the formation of a TiO2 nano layer that uniformly and thinly covered graphene sheets, ii) a trace amount of defects on graphene sheets, iii) a significant extension of the absorption edge into the visible light region, and iv) a dramatic suppression of electron-hole recombination. When tested for methylene blue decomposition under visible light, our nanocomposites exhibited the photocatalytic activity 15 and 5 times greater than that of TiO2-P25 and a conventional GO-based nanocomposite, respectively.
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