Five phyllosilicate samples of dioctahedral smectite, mica,
magnesium chlorite, saponite, and hectorite were
studied using X-ray photoelectron spectroscopy (XPS) to determine the
distribution of Al in the tetrahedral
and octahedral sheets. The binding energies of the Al(2p)
peaks in all the samples were obtained at 74.5 and
73.7 eV for octahedral and tetrahedral Al, respectively. The ratio
of the peak areas follows the same trend
as that of octahedral Al present in the phyllosilicate lattice. To
confirm the experimental result, localized
cluster models were generated from the pyrophyllite structure to
calculate their density of states by the density
functional theory (DFT). The DFT results match very well with XPS
results with respect to the difference
of binding energies of Al in the tetrahedral and octahedral sheet of
phyllosilicates; so this method is a useful
tool to measure the qualitative distribution of Al in the
phyllosilicates.
Catalysts H 2000Decomposition of Organic Compounds over NaBiO3 under Visible Light Irradiation. -The title compound is prepared by heating NaBiO 3 ·nH 2 O in air at 413 K for 5 h and characterized by XRD, UV/VIS diffuse reflectance spectroscopy, and DFT electronic structure calculations. The samples crystallize with ilmenite type structure in the space group R3. Decomposition experiments of gaseous 2-propanol and methylene blue in the liquid phase indicate that NaBiO3 is a promising material for photooxidation of organics in the visible light range. -(KAKO, T.; ZOU, Z.; KATAGIRI, M.; YE*, J.; Chem.
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