One-pot synthesis of Ag-MWCNT@TiO2 core-shell nanocomposites for photocatalytic reduction of CO2 with water under visible light irradiation

Meei Mei Gui, William Ming Ping Wong, Siang Piao Chai*, Abdul Rahman Mohamed

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

47 Citations (Scopus)


(Graph Presented) This work presents for the first time the preparation of silver (Ag)-doped MWCNT@TiO2 (multi-walled carbon nanotubes@titanium dioxide) core-shell nanocomposites with enhanced visible-light-responsive properties for the application in carbon dioxide (CO2) photoreduction. Comprehensive study was conducted on the synthesis and the photoreactivity performance of the Ag-MWCNT@TiO2 ternary nanocomposites at various Ag loadings ranging from 1 to 4 wt% (gram Ag per unit gram of TiO2). The properties of the Ag-MWCNT@TiO2 nanocomposites were characterized thoroughly and their photoreactivity was tested in a continuous CO2 photoreduction system under the irradiation of visible light source. The developed Ag-MWCNT@TiO2 demonstrated excellent activity in the reduction of CO2 into methane and ethylene. 2 wt% of Ag was found to be the most suitable loading, giving the highest total methane and ethylene formation of ca. 6.34 μmol/g-catalyst and 0.68 μmol/g-catalyst, respectively, for a reaction time span of 7.5 h along with the maximum hourly formation rate of methane and ethylene of ca. 0.91 μmol/g-catalyst/h and 0.048 μmol/g-catalyst/h, at the reaction time of 7th and 6th h, respectively. The results showed that the methane yield over 2 wt% Ag-MWCNT@TiO2 nanocomposites was approximately 1.60 folds higher than that of the undoped-MWCNT@TiO2 core-shell nanocomposites.

Original languageEnglish
Pages (from-to)272-278
Number of pages7
JournalChemical Engineering Journal
Publication statusPublished - 28 Jul 2015
Externally publishedYes


  • Carbon nanotubes
  • CO photoreduction
  • Core-shell nanocomposites
  • One-pot synthesis
  • Silver doping

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering


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