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Visible-Light Photoactivity of Bi-pyrochlores with High Fe Contents
閱讀：233 發(fā)布時(shí)間：2015-5-25| 提 供 商 | 美國(guó)布魯克海文儀器公司 | 資料大小 | 169.2KB |
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Three Bi-pyrochlores with different Fe contents (Bi2Ti2O7, Bi1.65Nb1.12Fe1.16O7 and Bi1.9Te0.58Fe1.52O6.87) were synthesized
in the form of nanopowders with similar morphological characteristics. All three nanopowders show an intensive visible-
light photocatalytic activity. The analysis of their band gap and absorption characteristics has shown a strong correlation
with the Fe-content indicating that a significant band gap reduction can be obtained by Fe incorporation. The photocatalytic
activity has not followed this trend. The initial increase in the Fe-content has resulted in a significant enhancement
of the photoactivity while with the further increase the photoactivity has slowly decreased. The reason for this behaviour
has been proposed to be in an opposing influence of the increased exciton density and recombination rate.
Keywords: Photoactivity, Bi-pyrochlores, Fe-content