One-pot synthesis of TiO2/graphene nanocomposites for excellent visible light photocatalysis based on chemical exfoliation method

Nhan Nu Thanh Ton, Anh Thi Ngoc Dao, Koichiro Kato, Takuma Ikenaga, Dai Xuan Trinh, Toshiaki Taniike

Research output: Contribution to journalArticle

16 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)109-117
Number of pages9
JournalCarbon
Volume133
DOIs
Publication statusPublished - 2018 Jul
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)

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