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Molecularly imprinted porous beads for the selective removal of copper ions
Author(s) -
Younis M. Rizwan,
Bajwa Sadia Z.,
Lieberzeit Peter A.,
Khan Waheed S.,
Mujahid Adnan,
Ihsan Ayesha,
Rehman Asma
Publication year - 2016
Publication title -
journal of separation science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.72
H-Index - 102
eISSN - 1615-9314
pISSN - 1615-9306
DOI - 10.1002/jssc.201500984
Subject(s) - copper , adsorption , molecular imprinting , dispersity , chemical engineering , porosity , selective adsorption , selectivity , emulsion , scanning electron microscope , polymerization , materials science , chemistry , polymer , chromatography , polymer chemistry , organic chemistry , catalysis , composite material , engineering
In the present work, novel molecularly imprinted polymer porous beads for the selective separation of copper ions have been synthesized by combining two material‐structuring techniques, namely, molecular imprinting and oil‐in‐water‐in‐oil emulsion polymerization. This method produces monodisperse spherical beads with an average diameter of ∼2–3 mm, in contrast to adsorbents produced in the traditional way of grinding and sieving. Field‐emission scanning electron microscopy indicates that the beads are porous in nature with interconnected pores of about 25–50 μm. Brunner–Emmett–Teller analysis shows that the ion‐imprinted beads possess a high surface area (8.05 m 2 /g), and the total pore volume is determined to be 0.00823 cm 3 /g. As a result of the highly porous nature and ion‐imprinting, the beads exhibit a superior adsorption capacity (84 mg/g) towards copper than the non‐imprinted material (22 mg/g). Furthermore, selectivity studies indicate that imprinted beads show splendid recognizing ability, that is, nearly fourfold greater selective binding for Cu 2+ in comparison to the other bivalent ions such as Mn 2+ , Ni 2+ , Co 2+ , and Ca 2+ . The imprinted composite beads prepared in this study possess uniform porous morphology and may open up new possibilities for the selective removal of copper ions from waste water/contaminated matrices.