Sains Malaysiana 39(5)(2010): 829–835

Synthesis and Characterization of a Molecularly Imprinted Polymer for Pb²⁺ Uptake Using 2-vinylpyridine as the Complexing Monomer

(Sintesis dan Pencirian Polimer Cetak Molekul untuk Pengambilan Pb²⁺ Menggunakan 2-vinilpyridin Sebagai Monomer Pengkompleks)

Nor Azah Yusof*, Appri Beyan, Md. Jelas Haron & Nor Azowa Ibrahim

Chemistry Department, Faculty of Science

Universiti Putra Malaysia, 43400 Serdang, Selangor, Malaysia

Received: 19 November 2009 / Accepted: 8 February 2010

ABSTRACT

Molecularly imprinted polymer (MIP) particles for selective extraction of Pb²⁺ ion from aqueous media were prepared using non-covalent molecular imprinting methods. 2-vinylpyridine was chosen as the complexing monomer. The imprinted polymer was synthesised by radical polymerisation. The template (Pb²⁺) was removed by leaching with 0.1 M HCl. The polymer particles (imprinted and non-imprinted) were characterised by spectroscopy. The effect of different parameters such as pH, kinetic, adsorption isotherm and selectivity were evaluated. The maximum adsorption capacity is 150 μg Pb²⁺/mg MIP. The adsorption efficiently occurred at pH 6. The selectivity coefficients of the imprinted polymer particles for Pb²⁺/Zn²⁺ and Pb²⁺/Al³⁺ were 13.55 and 1.71, respectively.

Keywords: Ion imprinting; metal extraction; molecular recognition; Pb²⁺ removal

ABSTRAK

Partikel polimer cetak molekul (MIP) untuk pengekstrakan selektif Pb²⁺ daripada media akuas telah disediakan menggunakan kaedah cetakan molekul bukan kovalen. 2-vinylpyridine telah dipilih sebagai monomer pengkompleks. Polimer cetak telah disintesis menggunakan pempolimeran radikal. Templat (Pb²⁺) telah disingkirkan menerusi pelunturan dengan 0.1 M HCl. Partikel polimer (cetakan dan bukan cetakan) telah dibuat pencirian menggunakan IR. Kesan bagi pelbagai parameter seperti pH, kinetic, isotem jerapan dan selektiviti telah dinilaikan. Kebolehan jerapan maksimum adalah 150 μg Pb²⁺/mg MIP. Jerapan adalah cekap pada pH 6. Pekali selektiviti bagi partikel polimer cetak bagi Pb²⁺/Zn²⁺ dan Pb²⁺/Al³⁺ adalah masing-masing 13.55 dan 1.71.

Kata kunci: Cetakan ion; pengecaman molekul; pengekstrakan logam; penyingkiran Pb²⁺

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*Corresponding author; email: azah@science.upm.edu.my