Synthesis and Characterization of Molecularly Imprinted Polymer Membrane for the Removal of 2,4-Dinitrophenol

Nor Yusof,Nor Zakaria,Abdul Abdullah,Md Haron,Nor Maamor

doi:10.3390/ijms14023993

Abstract

Molecularly imprinted polymers (MIPs) were prepared by bulk polymerization in acetonitrile using 2,4-dinitrophenol, acrylamide, ethylene glycol dimethacrylate, and benzoyl peroxide, as the template, functional monomer, cross-linker, and initiator, respectively. The MIP membrane was prepared by hybridization of MIP particles with cellulose acetate (CA) and polystyrene (PS) after being ground and sieved. The prepared MIP membrane was characterized using Fourier transform infrared spectroscopy and scanning electron microscopy. The parameters studied for the removal of 2,4-dinitrophenol included the effect of pH, sorption kinetics, and the selectivity of the MIP membrane. Maximum sorption of 2,4-nitrophenol by the fabricated CA membrane with MIP (CA-MIP) and the PS membrane with MIP (PS-MIP) was observed at pH 7.0 and pH 5.0, respectively. The sorption of 2,4-dinitrophenol by CA-MIP and PS-MIP followed a pseudo–second-order kinetic model. For a selectivity study, 2,4-dichlorophenol, 3-chlorophenol, and phenol were selected as potential interferences. The sorption capability of CA-MIP and PS-MIP towards 2,4-dinitrophenol was observed to be higher than that of 2,4-dichlorophenol, 3-chlorophenol, or phenol.

Highlights

Water pollution causes many problems for individual organisms, populations, and communities.The relationship between water quality and human activity is very complicated
The aim of this study is to investigate the adsorption of 2,4-DNP by the Molecularly imprinted polymers (MIPs) membrane, using cellulose acetate (CA) and polysulfone (PSf)
Membrane is imprinted, the CH stretching of the CA membrane band in CA membrane with MIP (CA-MIP) has clearly shifted towards a higher wavenumber, from 2937 cm−1 to 2946 cm−1

Summary

Introduction

Water pollution causes many problems for individual organisms, populations, and communities.The relationship between water quality and human activity is very complicated. Various methods are available to remove nitrophenols from water, including adsorption [2,3,4,5,6], microbial degradation [7], chemical oxidation [8], membrane separation [9], catalytic oxidation [10], and electrochemical treatment [11,12]. Some of these methods, such as adsorption on activated carbon, have high costs, as well as the potential to cause secondary pollution, and low-cost, highly selective removal methods continue to be sought [1]

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Conclusion