Molecularly imprinted polymers for selective adsorption of quinoline: theoretical and experimental studies |
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| Authors: | Liz Nayibe Martí nez Saavedra,Ricardo Gonç alves Penido,Lucas de Azevedo Santos,Teodorico C. Ramalho,Bruno E. Lobo Baeta,Má rcio C. Pereira,Adilson Candido da Silva |
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| Affiliation: | Departamento de Química, Instituto de Ciências Exatas e Biológicas, Universidade Federal de Ouro Preto, 35400-000 Ouro Preto Minas Gerais Brazil, +55 31 3559 1934 ; Departamento de Química, Universidade Federal de Lavras, 37200-000 Lavras Minas Gerais Brazil ; Instituto de Ciência, Universidade Federal dos Vales do Jequitinhonha e Mucuri, Engenharia e Tecnologia, 39803-371 Teófilo Otoni Minas Gerais Brazil |
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| Abstract: | The effects of solvent on the synthesis of molecularly imprinted polymers (MIPs) for the selective adsorption of quinoline were evaluated in this work. The MIPs were synthesized by the “bulk” method using the quinoline molecule (IQ) as a template in different solvents, such as toluene (MIPT) and chloroform (MIPC). The adsorbents were characterized by thermogravimetric analysis (TGA), Fourier transform infrared (FT-IR) spectroscopy, scanning electron microscopy (SEM), and N2 adsorption/desorption measurements. The influences of time, adsorbate concentration, and temperature on the adsorption of quinoline by MIPT and MIPC were evaluated. Maximum adsorption capacities (qe) of 35.23 and 24.10 mg g−1 were obtained for MIPT and MIPC, respectively. Thermodynamic studies indicate that occur physisorption and a spontaneous process (ΔadsG° < 0) entropically directed. Finally, the highest selectivity and reusability of MIPC for quinoline adsorption was ascribed to the better interaction between the chloroform and monomer, which favors the formation of porous adsorbents with higher numbers of adsorption sites.Molecularly imprinted polymers synthesized by a one-pot synthesis absorb quinoline efficiently and selectively. |
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