Please use this identifier to cite or link to this item: http://repositorio.ufla.br/jspui/handle/1/41009
Title: Nb-containing hematites Fe2−xNbxO3: the role of Nb5+ on the reactivity in presence of the H2O2 or ultraviolet light
Keywords: Hematite
Niobium
Organic oxidation
ESI-MS
Electrospray ionization mass spectrometry (ESI-MS)
Issue Date: Mar-2009
Publisher: Elsevier
Citation: SILVA, A. C. et al. Nb-containing hematites Fe2−xNbxO3: The role of Nb5+ on the reactivity in presence of the H2O2 or ultraviolet light. Applied Catalysis A: General, [S.l.], v. 357, n. 1, p. 79-84, Mar. 2009. Doi: 10.1016/j.apcata.2009.01.014.
Abstract: A series of Nb-containing hematites, Fe2−xNbxO3 (%Nb = 0.00, 1.49, 5.00 and 9.24) was prepared using the conventional co-precipitation method. Mössbauer and temperature-programmed reduction (TPR) measurements suggested the formation of the crystalline phase with partial substitution of Fe3+ by Nb5+ in the structure. N2 adsorption/desorption revealed that the presence of Nb has a remarkable effect on the textural properties of the material with an increase in the BET surface area. The reactivity of Fe2−xNbxO3 was investigated using the oxidation of the methylene blue dye used as a model pollutant. The obtained results showed that the presence of Nb seems not to act directly promoting the H2O2 decomposition, but improving the dye oxidation. The analysis using the ESI-MS technique showed partial oxidation observed through different intermediates before the mineralization. This suggests the use of Nb-doped hematite as an efficient catalyst in degradation reactions in the presence of H2O2 or ultraviolet light.
URI: https://www.sciencedirect.com/science/article/abs/pii/S0926860X09000404
http://repositorio.ufla.br/jspui/handle/1/41009
Appears in Collections:DQI - Artigos publicados em periódicos

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