TY - JOUR
T1 - Preparation of a reduced layered tungstic acid HxW 2O7 via acid treatment of Bi2W 2O9 in the presence of Sn2+ ions
AU - Tahara, Seiichi
AU - Minato, Takakazu
AU - Kumada, Nobuhiro
AU - Hayashi, Shigenobu
AU - Sugahara, Yoshiyuki
PY - 2008/12/1
Y1 - 2008/12/1
N2 - A reduced layered tungstic acid with a double-octahedral structure was prepared by acid treatment of Aurivillius-type Bi2W2O 9 in the presence of Sn2+ ions. While the color of the product formed by acid treatment with no Sn2+ ions present, H2W2O7, was yellow, a blue powder was obtained after the acid treatment in the presence of Sn2+ ions. No notable change in the morphology was observed after acid treatment. The X-ray diffraction pattern of the product acid-treated in the presence of Sn2+ ions was very similar to that of H 2W2O7. Essentially all the Bi3+ ions were lost upon acid treatment, indicating the occurrence of selective leaching of bismuth oxide sheets in Bi2W2O9. A UV-visible absorption spectrum and XPS analysis demonstrated that the W 6+ ions were partially reduced to W5+ ions, and the number of protons in the product was correspondingly 2.4 per [W2O 7]. These results suggest the successful formation of a reduced layered tungstic acid, H2.4W2O7.
AB - A reduced layered tungstic acid with a double-octahedral structure was prepared by acid treatment of Aurivillius-type Bi2W2O 9 in the presence of Sn2+ ions. While the color of the product formed by acid treatment with no Sn2+ ions present, H2W2O7, was yellow, a blue powder was obtained after the acid treatment in the presence of Sn2+ ions. No notable change in the morphology was observed after acid treatment. The X-ray diffraction pattern of the product acid-treated in the presence of Sn2+ ions was very similar to that of H 2W2O7. Essentially all the Bi3+ ions were lost upon acid treatment, indicating the occurrence of selective leaching of bismuth oxide sheets in Bi2W2O9. A UV-visible absorption spectrum and XPS analysis demonstrated that the W 6+ ions were partially reduced to W5+ ions, and the number of protons in the product was correspondingly 2.4 per [W2O 7]. These results suggest the successful formation of a reduced layered tungstic acid, H2.4W2O7.
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M3 - Conference article
AN - SCOPUS:67649386844
SN - 0272-9172
VL - 1056
SP - 246
EP - 251
JO - Materials Research Society Symposium - Proceedings
JF - Materials Research Society Symposium - Proceedings
T2 - Nanophase and Nanocomposite Materials V
Y2 - 26 November 2007 through 30 November 2007
ER -