Home – Home – Jornals – Chemistry for Sustainable Development 2005 number 4

Bi(III) oxochloride (BiOCl) synthesized from oxohydroxobismuth (III) nitrate trihydrate and NH₄Cl, was characterized by means of X-ray diffraction analysis, chemical and thermogravimetri analyses, electron microscopy and IR spectroscopy. In the work the practical usefulness of the ultra pure bismuth (III) oxochoride synthesis from metallic bismuth was shown. This method is comprised of the following stages: metallic bismuth is oxidized by an air, forming Bi₂O₃. The latter is dissolved in nitric acid solution (1:1). Than an insoluble bismuth (III) oxohydroxonitrate trihydrate is formed and precipitate is treated with NH₄Cl and HCl solutions at (60±10) ^oC with chlorine ions:bismuth = 1:1 molar ratio. This set of procedures helps to purify the initial bismuth composition from contaminants.