Bis-imidazolium type ion-exchange resin with poly(HIPE) structure for the selective separation of anions from aqueous solutions

ABSTRACT

The aim of this work was to obtain and characterize the selectivity of a new type of ion-exchanger – porous highly basic monolith with high internal phase emulsion (HIPE) structure. Poly(HIPE)ViM monolith of bis-vinylimidazolium salts was prepared in a water-in-oil-in-water emulsion (W₁/O/W₂). The structure of the resulting HIPE polymer was confirmed using scanning electron microscopy (SEM). Ion-exchange ability and the selectivity of monolithic anion-exchanger were tested towards the following inorganic anions: F⁻, Br, Cl⁻, NO₃⁻, SO₄^2-, Mo₇O₂₄^6-, PO₄^3-; and organic anions: malate, citrate, malonate, tartate, lactate and oxalate. The concentration of anions before and after the sorption was measured using ion chromatography.

KEYWORDS:

• ion-exchange
• poly(HIPE)
• sorption anions