Molecularly imprinted polymers for selective adsorption of quinoline: theoretical and experimental studies
Liz Nayibe Martínez Saavedra1, Ricardo Gonçalves Penido1, Lucas de Azevedo Santos2
1Departamento de Química, Instituto de Ciências Exatas e Biológicas, Universidade Federal de Ouro Preto 35400-000 Ouro Preto Minas Gerais Brazil adilsonqui@iceb.ufop.br adilsonufla@gmail.com +55 31 3559 1934.
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 (q e) 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 (Δads G° < 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.
