Synthesis and Characterization of Ion-Imprinted Polymer for Selective Adsorption of Zinc Ions in Aqueous media

G. Zuhra Memon1,*, Sumera Sarwar1, F. Memon2, Muhammad Qasim Samejo1 and A.G.M. Vasandani1

1Dr. M.A. Kazi Institute of Chemistry, University of Sindh, Jamshoro-76080, Pakistan

2Department of Physiology, University of Sindh, Jamshoro-76080, Pakistan

*Corresponding author: E-mail: zuhramemon_chem@yahoo.com

Abstract

In this study, a new zinc(II) ion imprinted polymer [Zn(II)-IIP] was synthesized by radical polymerization using using Zn(NO3)2, 4-vinylpyridine (4-VP), ethylene glycol dimethacrylate (EGDMA) and benzoyl peroxide (BPO) as the template ion, functional monomer, cross-linking agent and initiator, respectively. The prepared materials (imprinted polymers + non-imprinted polymer) were then characterized using Fourier transform infrared (FT-IR) spectroscopy and thermogravimetric analysis (TGA). These characterization methods confirmed the difference between ion imprinted polymers (IIP) and non-imprinted polymers (NIP). The imprinted Zn(II) ions were completely removed from polymer by leaching with 0.1 M HCl. The adsorption parameters such as contact time, initial concentration shaking speed and pH have been studied. Adsorption was found to be repaid within 40 min and maximum % adsorption was observed at pH 8. The Fruendlich, Langmuir and D-R models were used to study the partitioning behaviour of the adsorption systems. Using kinetics models 1st order rate constant (k) and Rd (intra particle rate constant) have been calculated. Some thermodynamical parameters i.e., studies DH, DG and DS have been calculated.

Keywords

Zinc(II), Ion-imprinted polymer, 4-Vinylpyridine, Selective adsorption.

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