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- W2269894908 abstract "Pyrochlore-type structure compounds, Bi2MTaO7 (M = Al, Ga, Fe or In), were synthesized by both the sol-gel and solid state method. In order to evaluate their photocatalytic activity, these compounds were tested on the degradation reaction of alizarin red S in aqueous solution. The characterization of the compounds included: XRD, SEM/EDAX, BET area, Eg value, DTA/TGA and FTIR. Pyrochlore-type structure compounds were obtained at lower temperatures (600-800°C) when prepared by the sol-gel method. The morphology of these compounds revealed the presence of nanoparticles. These materials also presented better SBET values (from 58 to 11 m2.g-1) than those obtained by the solid state method. All the materials showed Eg values within the visible light region (2.2-1.3 eV). Iron-containing pyrochlore prepared by the sol-gel method had the best performance as photocatalyst under visible light conditions. The photocatalytic results suggested this tendency: Fe > In > Al > Ga. In addition, the photocatalytic tests under UV light showed the following tendency: In > Fe > Al > Ga. In this case, the half time life (t1/2) of the degradation reaction was ∼30 min., using Bi2InTaO7 as photocatalyst, which was prepared by both the sol-gel method (at 600°C) and the solid state method (at 950°C)." @default.
- W2269894908 created "2016-06-24" @default.
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- W2269894908 date "2010-02-20" @default.
- W2269894908 modified "2023-10-07" @default.
- W2269894908 title "Photocatalytic performance of pyrochlore-type structure compounds, Bi2MTaO 7 (M = Al, Ga, Fe or In), on alizarin red S degradation" @default.
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