Chemical reduction of hematite by sodium borohydride |
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| Authors: | V G de Resende G M da Costa E De Grave L Datas |
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| Institution: | (1) Dep. de Química, Universidade Federal de Ouro Preto, 35400 Ouro Preto (MG), Brazil;(2) Department of Subatomic and Radiation Physics, University of Ghent, 9000 Gent, Belgium;(3) CIRIMAT (LCMIE), Université Paul Sabatier, 31062 Toulouse, France |
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| Abstract: | Well-crystallized hematite was suspended in water and treated at room-temperature (RT) with sodium borohydride. The product
of the reaction is a highly magnetic black powder, which is stable at RT. The NaBH4 treatment converts about half of the hematite to an amorphous Fe–B alloy and to a small fraction of sub-micron sized, amorphous
metallic-Fe nodules. Heating at 400°C of this composite has resulted in the crystallization and/or oxidation of more than
half of the amorphous Fe–B phase to α-Fe and Fe3O4 and B2O3, respectively. After treatment at 800°C, the metallic Fe and the amorphous Fe–B have completely vanished, and the resulting
product consists of hematite and FeBO3 embedded in the matrix of α-Fe2O3. |
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| Keywords: | Fe– B alloy hematite sodium borohydride M?ssbauer spectroscopy |
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