Nashrieh Shimi va Mohandesi Shimi Iran

Nashrieh Shimi va Mohandesi Shimi Iran

Synthesis and Characterization of Lead (II) Ion-Imprinted Nanopolymer Using Pyridine-2,6-Dicarboxylic Acid Ligand and Evaluation of its Performance in Lead Ions Extraction

Document Type : Research Article

Authors
Arefe Alijan
Sayed Reza Hosseini-Zavvarmahalleh
Shahram Ghasemi-mir
Department of Applied Chemistry, Faculty of Chemistry, University of Mazandaran, Babolsar, I.R.IRAN
Abstract
Ion-imprinted polymers (IIPs) are synthetic materials that possess specific recognition sites for target ions. These sites are compatible with the target ions in terms of shape, size, and functional groups, and they can be effectively used as solid-phase materials for the extraction and preconcentration of ions from complex matrices. In this study, a lead ion-imprinted nanopolymer (Pb-IIP) was synthesized through radical polymerization using 4-vinylpyridine as the functional monomer, pyridine-2,6-dicarboxylic acid as the ligand, acetonitrile as the solvent, ethylene glycol dimethacrylate as the cross-linker, azobisisobutyronitrile as the initiator, and lead ions (Pb²⁺) as the template. The removal of lead ions from the polymer matrix was carried out using 2 M hydrochloric acid as the eluent, leaving behind cavities that match the shape and size of Pb²⁺ ions and thus enable their selective sorption. The synthesized structure was characterized using FE-SEM, EDS, XRD, FT-IR, BET, and TGA techniques. The results showed that the polymer consisted of spherical nanoparticles with an average diameter of about 20 nm and pores smaller than 2 nm in diameter. The specific surface area of the sample was reported to be 112 m²/g. The concentration of lead ions was measured using graphite furnace atomic absorption spectroscopy (GFAAS). The optimal conditions for maximum recovery (approximately 90%) were obtained at pH = 6, with sorption and desorption times of 15 and 25 min., respectively.
Keywords
Nanostructured ion-imprinted polymer
Graphite furnace atomic absorption spectrometry
Template ion
Micropore
Structural characterization

Subjects

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