Hussain Shah, Syed Asim (2022) Synthesis, characterization and adsorption studies of deep-eutectic solvent molecular imprinted polymer for the removal of bisphenol A. Masters thesis, Universiti Tun Hussein Onn Malaysia.

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Abstract

Molecularly imprinted polymer (MIP) is a class of powerful materials with promising selective molecule recognition abilities. However, the conventional MIPs have a relatively low binding capacity and selectivity. To improve this characteristic of MIP, the addition of deep eutectic solvent (DES) as a functional monomer in the polymerization process was studied to synthesize potential MIP. The study focuses on the synthesis, characterization, and adsorption behavior of deep eutectic solvent molecularly imprinted polymer (DES-MIP), molecular imprinted polymer (MIP), and hybrid deep eutectic solvent molecular imprinted membrane (HDES-MIP) for the selective removal of bisphenol A (BPA) from aqueous medium. The potential of DES in MIP was studied by synthesizing DES-MIP using DES functional monomer. DES was synthesized by mixing choline chloride (ChCl) and methacrylic acid (MAA) by ratio of 1:2. DES-MIP was then compared with conventional MIP synthesized by MAA as a functional monomer. Both DES-MIP and MIP were prepared by the free radical polymerization process via a bulk polymerization method. Prepared DES-MIP was then hybridized with cellulose acetate (CA) to obtain the HDES-MIP membrane. The characterization results of X-ray diffraction (XRD), Fourier transform infrared spectrometry (FTIR), scanning electron microscopy (SEM), thermogravimetric analysis (TGA), and differential scanning calorimeter (DSC) confirmed the characteristics of synthesized DES-MIP, MIP and HDES-MIP. The DES-MIP has a higher selectivity for BPA (17.72 mg/g) than competing analogs, including bisphenol AP (9.78 mg/g), 2-naphthol (8.25), and 4-tertiary butyl-phenol (6.98 mg/g). The optimization parameters include adsorption pH, adsorption kinetics, adsorption isothermal, and thermodynamic studies were carried out. DES-MIP, MIP and HDES-MIP followed Pseudo-second order and Langmuir isothermal models. According to reusability tests, the DES-MIP can be recycled five times without losing significant adsorption capacity. As a result, the addition of DES in the polymerization process improved the physical and chemical properties and enhanced the recognition capacity of MIP, thus affecting the adsorption behavior

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