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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 30, Number 3
BKCSDE 30(3)
March 20, 2009

Title	Synthesis of Bi₂WO₆ Nanometer Sheet Shaped and Approach to the Photocatalysis
Author	Dong Young Kim, Sujung Kim, Misook Kang*
Keywords	Bi₂WO₆, Thermal treatment, Photoluminescence, Methyl orange removal
Abstract	For use as a photocatalyst, bismuth tungsten oxide, Bi₂WO₆, was successfully synthesized by hydrothermal treatment at pH = 11 and heating at 200℃ for 24 h, and samples were subsequently thermal treated at 400, 600, and 800℃ to increase crystallinity. TEM results revealed that the initial untreated particles were sheet-shaped, grain size was below 80 nm, and it increased with treated temperatures. These Bi₂WO₆ samples absorbed at around 400 nm in the visible light range and the intensity of absorption was particularly strongest in samples thermal treated at 600℃. Their photoluminescence abilities, related to the recombination between the excited electrons and holes, were overall small for other general photocatalysts such as TiO₂, and the smallest in the case of thermal treatment at 600℃, as reversible result of UV-visible absorbance. Methyl orange of 5.0 ppm aqueous solution was almost completely removed after 2 h when treated over the Bi₂WO₆ thermal treated at 600℃.
Page	630 - 635
Full Text	PDF

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