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- 저자 : Kisch, Horst (검색결과 1 건)
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On the origin of visible light activity in carbon-modified titania
Zabek, Przemyslaw,Eberl, Joachim,Kisch, Horst Korean Society of Photoscience 2009 Photochemical & photobiological sciences Vol.8 No.2
Characterization of a commercial carbon-modified titania visible light photocatalyst (VLP) reveals a quasi-Fermi level of -0.50 V at pH 7 and characteristic C1s binding energies of 284.8 eV and 286.3 eV as measured by XPS. Treatment with sodium hydroxide affords a soluble brown extract $SENS_{ex}$ exhibiting in the IR spectrum intense peaks at $1420\;cm^{-1}$ and $1580\;cm^{-1}$, tentatively assigned to an arylcarboxylate group. Both the residue and the solution $SENS_{ex}$ do not induce significant visible light mineralization of 4-chlorophenol. However, after heating them together in suspension, followed by calcination at $200^{\circ}C$ the resulting powder $VLP_{reas}$ exhibits the same quasi-Fermi level and C1s binding energies as the original VLP. Furthermore, within experimental error its visible light activity is identical with that of VLP. These results clearly indicate that, at least for VLP but probably also for other "carbon-doped" titania materials, an aromatic carbon compound and not substitutional or interstitial carbon is the origin of visible light activity.
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