Abstract
In the presented studies, ionic liquids, 1-propyl-3-undecanoylpyridinium bromide and 1-propyl-3-undecanoylpyridinium chloride, were successfully encapsulated. The sorbents were prepared by the suspension copolymerisation of styrene and divinylbenzene with 14–19% participation of the ionic liquids. The resulting microcapsules were characterized by various techniques such as FT-IR, Raman, and TGA. The microscopy analysis showed that the morphologies of the prepared microcapsules were spherical with a clearly porous structure, in which the pores in the surface had diameter up to 8.5 μm. The metals removal with the microcapsules was affected by the morphology of microcapsules, structure of the encapsulated ionic liquid, as well as the pH, shaking time, concentration of metals ions, NaCl or HCl, and temperature of the process. The results analysis indicated that binding of Zn(II) and Cu(II) was mainly controlled by chemisorption with strong interaction metal-extractant. The maximum sorption capacity was 151 and 74 mg Cu(II) and Zn(II), respectively per gram of the sorbent.Both metals can be separated from the aqueous solutions containing NaCl, and after that desorbed with diluted HCl solutions, without loss in the adsorption capacity.
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