Properties of iron oxide nano-powders obtained by a proteic sol-gel method

Reference Presenter Authors
(Institution)
Abstract
06-135 Jakeline Raiane Dora dos Santos Silva, R.M.(Universidade Federal da Paraíba); Lima, A.V.(Universidade Federal da Paraíba); Santos, J.R.(Universidade Federal do Rio Grande do Norte); Morais, A.d.(Universidade Federal da Paraíba); Fulgêncio, E.B.(Universidade Federal da Paraíba); Melo, K.P.(Universidade Federal da Paraiba); Aquino, F.d.(Universidade Federal da Paraíba); Dutra, R.P.(Universidade Federal da Paraíba); Grilo, J.P.(Universidade de Aveiro); Macedo, D.A.(Universidade Federal da Paraíba); Gama-Fe2O3 (maghemite) and alfa-Fe2O3 (hematite) are iron oxides with various technological applications, including dyes, catalysts, gas sensors, electrodes, and so on. These materials have already been prepared by a variety of synthetic methods. However, there is no literature information on their syntheses using gelatin (a natural polymer) as an environmentally friendly precursor. In this work, this proteic sol-gel method was used to prepare the Gama-Fe2O3/alfa-Fe2O3 composite and a single phase alfa-Fe2O3 material by changing the calcination temperature. The calcined powders were investigated by XRD (with Rietveld refinement), UV-Vis, SEM, and tested as photocatalysts for methylene blue (MB) degradation under visible light irradiation. The MB degradation efficiency of the hematite was much higher than that of the double phase iron oxide.
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