Ecologically Safe Method to Obtain High-Purity Bismuth (III) Oxobromide
M. N. NOVOKRESHCHENOVA AND YU. M. YUKHIN
Institute of Solid State Chemistry and Mechanochemistry, Siberian Branch of the Russian Academy of Sciences, Ul. Kutateladze 18, Novosibirsk 630128 (Russia)
E-mail: Yukhin@solid.nsc.ru
Pages: 505-509
Abstract
The interaction of oxohydroxo bismuth (III) nitrate trihydrate with ammonium bromide solutions is investigated by means of X-ray phase analysis, thermogravimetry, electron microscopy, IR spectroscopy and chemical analysis. The reasonableness of obtaining high-purity bismuth (III) oxobromide of the composition BiOBr from metal bismuth after its preliminary oxidation with the oxygen of the air is demonstrated. Thus formed bismuth oxide is dissolved in nitric acid (1 : 1); bismuth is purified from the accompanying metals by means of its precipitation in the form of oxohydroxo bismuth (III) nitrate trihydrate and treatment of the resulting precipitate with NH4Br or HBr solutions at a temperature of (60
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