Synthesis, Phase Transformations of Polymorphous Nanooxidic Forms of Iron and Their Interaction with Sulfur Dioxide |
| T.L. Rakitskaya, A.S. Truba, A.P. Nazar, T.A. Kiose
Faculty of Chemistry and Pharmacy, Odessa I.I. Mechnikov National University, 2, St. Dvoryanskaya, 65082 Odessa, Ukraine |
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| Monophase iron oxide samples (α-Fe2O3, γ-Fe2O3, and α-FeO(OH)) and also mixtures of iron oxides with different phase compositions, i.e., Fe3O4, γ-FeO(OH), α-FeO(OH), and α-FeO(OH), α-Fe2O3, were obtained by a precipitation method with variable nature of iron salts, precipitators as well as drying and calcination temperatures. The samples were identified by XRD, SEM, and FT-IR spectroscopy methods. The samples were also tested in the reaction with sulfur dioxide at an initial SO2 concentration in the gas-air mixture of 150 mg/m3, a gas-air mixture volume flow rate of 16.6 cm3/s, the relative humidity of 76%, and a temperature of 20°. Interaction of SO2 with iron(III) nanooxides in the air does not result in the formation of new phases. The FT-IR spectra give evidence of the formation of surface sulfite and bisulfite forms from SO2 adsorbed. |
DOI:10.12693/APhysPolA.141.281 topics: iron(III) oxide, nanooxide, phase transformation, sulfur dioxide |