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Molecular Recognition and Scavenging of Arsenate from Aqueous Solution Using Dimetallic Receptors
Author(s) -
Moffat Chris D.,
Weiss Dominik J.,
Shivalingam Arun,
White Andrew J. P.,
Salaün Pascal,
Vilar Ramon
Publication year - 2014
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201404723
Subject(s) - arsenate , aqueous solution , scavenging , chemistry , receptor , biochemistry , organic chemistry , arsenic , antioxidant
A series of copper(II), nickel(II) and zinc(II) dimetallic complexes were prepared and their affinities towards arsenate investigated. Indicator displacement assays (IDAs) were carried out to establish the complexes with best affinities towards arsenate. A di‐zinc complex ( 3 ) was selected and its arsenate‐binding abilities investigated by isothermal titration calorimetry (ITC). The X‐ray crystal structure of this metallo‐receptor bound to arsenate is also reported, which allowed us to establish the binding mode between 3 and this oxyanion. Immobilising 3 onto HypoGel resin yielded a novel adsorbent (Zn–HypoGel) with high affinity for arsenate. Adsorption of arsenate from competitive solutions and natural groundwater was greater than that of the commercially used iron oxide Bayoxide E33. Zn–HypoGel could be efficiently and simply regenerated by washing with sodium acetate solution.