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Removal of arsenic from aqueous solutions by the method of precipitate floation |
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Removal of arsenic from aqueous solutions by the method of precipitate floation Authors: E. Pieczaba, S. Sanak-Rydlewska, D. Zięba
This paper presents the results of laboratory studies on elimination of arsenic from aqueous solutions by flotation with colloidal precipitate of iron hydroxide (also known in the literature as ferrihydrite, goethite, or oxide-hydroxide phases). Sodium dodecyle sulphate and dodecylamine hydrochoride were used as collectors. The study was performed for various pH values. The results were interpreted in terms of measured values of electrophoretic mobility for iron hydroxide, and thus the calculated values of the zeta potential. The paper also gives possible mechanisms of removing arsenic from aqueous solutions by the adsorbing colloid flotation (ACF) method, using hydrated iron(III) oxides. Under the conditions developed for co-precipitation and flotation, about 96% of the arsenic could be removed from the studied systems.
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2009