Journal
MATERIALS SCIENCE & ENGINEERING C-BIOMIMETIC AND SUPRAMOLECULAR SYSTEMS
Volume 26, Issue 4, Pages 588-592Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.msec.2005.04.009
Keywords
iron-oxidizing bacteria; Jarosite; schwertmannite; transformation
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Schwertinarmite [Fe(8)O(8)(OH)(6)SO(4)] and jarosite [XFe(3)(SO(4))(2)(OH)(6)] were synthesized from FeSO(4)-mineral salts solutions that were inoculated jarosite upon increasing with acidophilic iron-oxidizing bacteria (Acidithiobacillus ferrooxidans). Schwertmannite was transformed to NH(4)(+)/H3O(+) the aging time (19 to 40 days), temperature (36 to 45 degrees C), or the ammonium concentration (11.4 to 111.4 mM) in acid (about pH 2.0) media. Thus, in this phase transformation, metastable schwertmannite served as a solid phase precursor for jarosite formation. Scanning electron microscope and chemical analyses showed that the morphology, specific surface area and chemical composition of the jarosites thus produced varied depending on the experimental conditions. Because the surface areas and the molar ratios of Fe:S in the two Fe(III) hydroxysulfates are different, the transformation of schwertmannite to jarosite impacts the biogeochemistry of Fe and S as well as minor and trace metals in acid mine drainage. (c) 2005 Elsevier B.V. All rights reserved.
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