Selective Removal of Sulfate from Water by Precipitation with a Rigid Bis‐amidinium Compound
Nikki A. Tzioumis, Duncan A. Cullen, Katrina A. Jolliffe, Nicholas G. White
Abstract
Abstract A simple, readily prepared biphenyl bis‐amidinium compound ( 1⋅Cl 2 ) 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 CO 3 2− and HPO 4 2− . 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⋅SO 4 forms a tightly packed, anhydrous, structure where each sulfate anion receives eight hydrogen bonds from amidinium N−H hydrogen bond donors.
Topics & Concepts
AnhydrousSulfateChemistryPrecipitationHydrogen bondSelectivitySeawaterInorganic chemistryIonMoleculeOrganic chemistryPhysicsMeteorologyOceanographyCatalysisGeologyMolecular Sensors and Ion DetectionChemical Synthesis and CharacterizationCovalent Organic Framework Applications