Modification of MWCNT@TiCO 2 core-shell nanocomposites withtransition metal oxide dopants for photoreduction of carbon dioxideinto methane

Meei Mei Gui, Siang Piao Chai*, Abdul Rahman Mohamed

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)

Abstract

Titanium dioxide (TiCO 2 ) doped with visible-light-responsive metal oxides has been widely reported forimproving the visible light absorption performance of TiCO 2 and its photocatalytic activity. The metaloxides could function as 'charge-carrier traps' that transport electrons from TiCO 2 through the hetero-junction of the TiCO 2 -metal oxides. In this work, the common transition metal oxides, i.e. FeO x , CuO x , NiO,CoO x and ZnO, were doped onto MWCNT@TiCO 2 core-shell nanocomposites. The effects of the metal oxidedopants on the photoactivity of the core-shell nanocomposites on CO 2 reduction were studied. Charac-terization with diffuse-reflectance UV-vis showed significant improvement on visible light absorptionafter doping MWCNT@TiCO 2 with CuO x , FeO x and CoO x with the adsorption band-edge position red-shiftedinto the wavelength range of 480-630 nm. CuO-MWCNT@TiCO 2 appeared to be the most active one amongall the studied photocatalysts, achieving a total methane formation of 0.93 mol/g-catalyst.

Original languageEnglish
Pages (from-to)37-43
Number of pages7
JournalApplied Surface Science
Volume319
Issue number1
DOIs
Publication statusPublished - 01 Jan 2014
Externally publishedYes

Keywords

  • Metal dopants
  • Methane formation
  • Transition metal oxides
  • Visible lightCO photoreduction

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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