Selective Removal of Sulfate from Water by Precipitation with a Rigid Bis-amidinium Compound |
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| Authors: | Dr Nikki A Tzioumis Duncan A Cullen Prof Katrina A Jolliffe Prof Nicholas G White |
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| Institution: | 1. Australian Research Council Centre of Excellence for Innovations in Peptide and Protein Science, School of Chemistry, The University of Sydney, Sydney, NSW, 2006 Australia;2. Research School of Chemistry, Australian National University, Canberra, ACT, 2600 Australia |
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| Abstract: | A simple, readily prepared biphenyl bis-amidinium compound ( 1⋅Cl2 ) is able to selectively precipitate sulfate from water. The precipitant is effective at concentrations as low as 1 mM and shows complete selectivity against monovalent anions, and high selectivity even against CO32− and HPO42−. It is highly effective (>90 % sulfate removed) in both seawater and highly acidic conditions relevant to mining waste-streams. X-ray crystallography reveals that 1⋅SO4 forms a tightly packed, anhydrous, structure where each sulfate anion receives eight hydrogen bonds from amidinium N−H hydrogen bond donors. |
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| Keywords: | Anions Precipitation Selectivity Sulfate Supramolecular Chemistry |
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