Photocatalytic reduction of carbon dioxide over Cu/TiO2 photocatalysts
Language English Country Germany Media print-electronic
Document type Journal Article
Grant support
033RC003
Federal Ministry of Education and Research of Germany
PubMed
29285696
DOI
10.1007/s11356-017-0944-8
PII: 10.1007/s11356-017-0944-8
Knihovny.cz E-resources
- Keywords
- CH4, CO2 reduction, Cu/TiO2, Photocatalysis,
- MeSH
- Models, Chemical MeSH
- X-Ray Diffraction MeSH
- Photochemical Processes * MeSH
- Catalysis MeSH
- Copper chemistry MeSH
- Carbon Dioxide chemistry MeSH
- Spectrum Analysis, Raman MeSH
- Spectroscopy, Fourier Transform Infrared MeSH
- Titanium chemistry MeSH
- Publication type
- Journal Article MeSH
- Names of Substances
- Copper MeSH
- Carbon Dioxide MeSH
- Titanium MeSH
- titanium dioxide MeSH Browser
The photocatalytic reduction of CO2 with H2O was investigated using Cu/TiO2 photocatalysts in aqueous solution. For this purpose, Cu/TiO2 photocatalysts (with 0.2, 0.9, 2, 4, and 6 wt.% of Cu) have been synthesized via sol-gel method. The photocatalysts were extensively characterized by means of inductively coupled plasma optical emission spectrometry (ICP-OES), N2 physisorption (BET), XRD, UV-vis DRS, FT-IR, Raman spectroscopy, TEM-EDX, and photoelectrochemical measurements. The as-prepared photocatalysts contain anatase as a major crystalline phase with a crystallite size around 13 nm. By increasing the amount of Cu, specific surface area and band gap energy decreased in addition to the formation of large agglomeration of CuO. Results revealed that the photocatalytic reduction of CO2 decreased in the presence of Cu/TiO2 in comparison to pure TiO2, which might be associated to the formation of CuO phase acting as a recombination center of generated electron-hole pair. Decreasing of photoactivity can also be connected with a very low position of conduction band of photocatalysts with high Cu content, which makes H2 production necessary for CO2 reduction more difficult.
