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Abstract: This paper describes the synthesis and development of molecular imprinted polymer (MIP) as an effective adsorbent for the removal of genotoxic compound p-nitroaniline from environmental water samples. The synthesis was designed and optimized through the selection of different type of functional monomers and porogens. A novel molecular imprinted polymer was synthesized by the radical bulk polymerization using p-nitroaniline as a template, methacrylic acid as functional monomer, EGDMA as cross-linker and toluene- acetonitrile (95:5, v/v) as porogen. By comparing the performance of the synthesized MIPs in a mixed solution with different ratio of acetonitrile-water, the results showed a higher recognition and adsorption capacity for p-nitroaniline in water because of the synergistic effect of hydrophobic and specific binding interactions for polymers. The adsorption isotherm of p-nitroaniline on the MIP was well described by the Langmuir model with a maximum adsorption capacity of 309.8 mu mol/g. The adsorption kinetic was investigated and well fitted to the pseudo second-order model (R-2 > 0.999) and rapidly reached the equilibrium after 30 minutes. It was found that p-nitroaniline could be selectively recognized by MIP in presence of its structural analogues. The regeneration property of the MIP was also investigated and found that it can be regenerated at least five adsorption regeneration cycles. Furthermore, the MIP was successfully applied for effective removal of p-nitroaniline from real river water samples.
Template and target information: p-nitroaniline, 4-nitroaniline
Author keywords: molecular imprinted polymer, p-Nitroaniline, Genotoxic compounds, Adsorption removal