Novel Cd(II) methacrylate monomer complex with 1-vinylimidazole: Synthesis, characterization and ion imprinted polymer applications

Abstract

A novel [Cd(maa)2(vim)2H2O]·H2O monomer complex was synthesized using methacrylic acid (maaH) and 1-vinylimidazole (vim) that are suitable ligands for polymerization. Cd(II) ion imprinted polymer (Cd(II)-IIP) was prepared by precipitation polymerization technique using monomer complex, EGDMA, and AIBN as functional monomer, crosslinker, and initiator, respectively. The structure of the monomer complex was elucidated by single-crystal X-ray diffraction method. Infrared spectroscopy (FT-IR) and thermogravimetric analysis (TGA) methods were used for characterization both of the monomer complex and Cd(II)-IIP. Scanning electron microscopy / energy-dispersive X-ray spectroscopy (SEM/EDX) methods were used for observation surface morphology and content of the polymer surfaces. The adsorption performance and selectivity properties of Cd(II)-IIP were also investigated. The maximum adsorption capacity of Cd(II)-IIP was 43.0 mg/g with 250 mg/L initial Cd(II) concentration at pH:6.0, and the selectivity was higher for Cd2+ ions than that of Pb2+, Ni2+, and Zn2+ as competitor ions. The Langmuir and Freundlich isotherm models were applied comparatively to experimental results. Cd(II) ion content of the solutions determined by inductively coupled plasma mass spectrometry (ICP-MS).