News Column

Researchers from Jagiellonian University Report Findings in Photocatalytics

May 27, 2014

By a News Reporter-Staff News Editor at Life Science Weekly -- Fresh data on Photocatalytics are presented in a new report. According to news reporting originating in Krakow, Poland, by NewsRx journalists, research stated, "The parent TiO2 and cerium doped TiO2 photocatalysts with Ce loadings 0.28-10 mol.% were prepared by the sol-gel method controlled within reverse micelles of nonionic surfactant Triton X-114. Photocatalysts were comprehensively characterized using nitrogen physisorption, XRD, XPS, contact potential difference measurements, Raman spectroscopy, and DR UV-vis spectroscopy and their performance was explored in the CO2 photocatalytic reduction for the first time."

The news reporters obtained a quote from the research from Jagiellonian University, "Concerning photocatalysts properties, it was revealed that the inhibiting effect of cerium on the TiO2 crystallites growth occurred only up to 3 mol.% of Ce when the incorporation of Ce4+ into the anatase lattice took place. This phenomenon was correlated with the expansion of anatase cell volume. At higher Ce loadings (>= 5 mol.%) the anatase lattice was saturated and the formation/separation of amorphous ceria and/or ceria (similar to 1 nm) nucleation occurred, accompanied by the increase of TiO2 anatase crystallite-size and the limitation of value of anatase cell volume. Further, it was found out that the mesoporosity of photocatalysts may be preferentially attributed to voids existing between the individual crystallites and thus can be influenced by changes in the crystallite size. The modification of TiO2 with cerium affected also the spectral response of photocatalysts, shifting it to the visible light region. However, this property itself was not crucial in the CO2 photocatalytic reduction. The key role in the CO2 photocatalytic reduction played the energies of electrons and holes within the electronic structure of photocatalysts, which were markedly affected by the Ce atoms addition."

According to the news reporters, the research concluded: "For 0.28 mol.%Ce/TiO2, both electrons and holes have required potentials for the photocatalytic reduction of CO2, while for 3 mol.% and higher Ce loadings the energy of electrons was already below H+ reduction potential and thus the photocatalytic performance of these catalysts was decreasing."

For more information on this research see: Preparation, characterization and photocatalytic properties of cerium doped TiO2: On the effect of Ce loading on the photocatalytic reduction of carbon dioxide. Applied Catalysis B-Environmental, 2014;152():172-183. Applied Catalysis B-Environmental can be contacted at: Elsevier Science Bv, PO Box 211, 1000 Ae Amsterdam, Netherlands (see also Photocatalytics).

Our news correspondents report that additional information may be obtained by contacting L. Matejova, Jagiellonian University, Fac Chem, PL-30060 Krakow, Poland. Additional authors for this research include K. Koci, M. Reli, L. Capek, A. Hospodkova, P. Peikertova, Z. Matej, L. Obalova, A. Wach, P. Kustrowski and A. Kotarba.

Keywords for this news article include: Krakow, Poland, Europe, Cerium, Chemicals, Chemistry, Photocatalyst, Carbon Dioxide, Nanotechnology, Emerging Technologies, Inorganic Carbon Compounds, Lanthanoid Series Elements

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Source: Life Science Weekly

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