Date of Award

12-1-2015

Degree Type

Thesis

University or Center

Clark Atlanta University(CAU)

Degree Name

M.S.

Department

Chemistry

First Advisor

Xiu-Ren Bu, Ph.D

Abstract

The aim of the study is to synthesize new nanocomposites consisting of superparamagnetic iron oxide nanoparticle (Fe3O4) incorporated into poly(2- hydroxyethyl methacrylate) hydrogel (pHEMA) in different ratios (75% and 100%). These materials can be used in water treatment and can be easily removed/controlled by an external magnetic field. The nanoparticles were synthesized by a co-precipitation method and then embedded in pHEMA to produce magnetic pHEMA nanocomposite hydrogel (mHEMA). PHEMA was synthesized by free radical polymerization. The resulting data for mHEMA were compared to those obtained from pHEMA hydrogel.

The adsorption of malachite green (MG) dye onto pHEMA and mHEMA was carried out in this project. The effects of different parameters such as the initial MG concentration and contact time on MG adsorption were investigated. The hydrogels were characterized by Scanning Electron Microscopy (SEM) and X-ray diffraction (XRD) techniques to confirm the presence of Fe3O4 nanoparticles inside the pHEMA hydrogel. A density test was used to show that the mesh size of 75% mHEMA, 100% mHEMA and pHEMA hydrogels were 8.5, 43.9 and 67.7 A, respectively. The adsorption equilibrium data of mHEMA were best represented by the Langmuir model. The maximum adsorption capacities of 100% and 75% mHEMAs were 5.91and 11.06 mg/g in the wet state and 3.45 and 9.90 mg/g in dry state, respectively. This study found that pHEMA hydrogel had a higher maximum adsorption capacity, 15.94 mg/g in wet state and 15.28 mg/g in dry state, than mHEMAs.

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