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Angew Chem Int Ed Engl
; 62(12): e202218360, 2023 Mar 13.
Artículo
en Inglés
| MEDLINE
| ID: mdl-36702770
RESUMEN
A simple, readily prepared biphenyl bis-amidinium compound (1â Cl2 ) is able to selectively precipitate sulfate from water. The precipitant is effective at concentrations as low as 1â mM and shows complete selectivity against monovalent anions, and high selectivity even against CO3 2- and HPO4 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 1â SO4 forms a tightly packed, anhydrous, structure where each sulfate anion receives eight hydrogen bonds from amidinium N-H hydrogen bond donors.