Modification of MWCNT@TiO2 core-shell nanocomposites with transition metal oxide dopants for photoreduction of carbon dioxide into methane

作者：Gui Meei Mei; Chai Siang Piao^*; Mohamed Abdul Rahman

来源：Applied Surface Science, 2014, 319: 37-43.

DOI：10.1016/j.apsusc.2014.07.161

• Transition metal oxides
• Metal dopants
• Visible light
• CO2 photoreduction
• Methane formation

Titanium dioxide (TiO2) doped with visible-light-responsive metal oxides has been widely reported for improving the visible light absorption performance of TiO2 and its photocatalytic activity. The metal oxides could function as %26apos;charge-carrier traps%26apos; that transport electrons from TiO2 through the hetero-junction of the TiO2-metal oxides. In this work, the common transition metal oxides, i.e. FeOx, CuOx, NiO, CoOx and ZnO, were doped onto MWCNT@TiO2 core-shell nanocomposites. The effects of the metal oxide dopants on the photoactivity of the core-shell nanocomposites on CO2 reduction were studied. Characterization with diffuse-reflectance UV-vis showed significant improvement on visible light absorption after doping MWCNT@TiO2 with CuOx, FeOx and CoOx with the adsorption band-edge position red-shifted into the wavelength range of 480-630 nm. CuO-MWCNT@TiO2 appeared to be the most active one among all the studied photocatalysts, achieving a total methane formation of 0.93 mu mol/g-catalyst.

• 出版日期2014-11-15