Abstract
Molecularly imprinted polymers (MIP) are known as high selective sorbent, however, its application in aqueous medium is very limiting. In this way, a new hybrid MIP was successfully synthesized for saccharin (SAC) extraction in aqueous medium. SAC determination in surface waters becomes a challenge due to high dissipation that results in low concentration and susceptibility to potential interferences. Two polymer materials synthesized through bulk (HMIP-B) and suspension (HMIP-S) polymerizations were studied, and its performance has been compared according to morphological, adsorption isotherms, thermodynamics, and selectivity properties. The adsorption process was thermodynamically favorable and adsorption capacities (qe) were 1.24 and 4.32 mg g-1 for HMIP-B and HMIP-S, respectively. The material was characterized as heterogeneous with two binding sites fitted by Langmuir–Freundlich model and pseudo-second-order model. The imprinting factor (IF) was 4.8 for both materials and the HMIP-S presented superior results in selectivity, with a distribution constant (Kd) value of 12.1 times higher than HMIP-B for saccharin and a selectivity coefficient (k) of 7.73, 9.25 and 2.54 for acesulfame, caffeine and cyclamate, respectively. The selecitivity of HMIP in aqueous medium was tested in surface water samples, resulting in 89% of SAC recovery.
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Acknowledgments
The authors thank CAPES (Finance code 001) for doctoral fellowship, FAPDF (Process nº 0193.001046/2015 and process nº 193.000.566/2009), CNPq (process nº 308748/2015-8), INCTAA, Institute of Chemistry, University of Brasilia, for the financial support.
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Dourado, C.S., Casarin, F., Braga, J.W.B. et al. Synthesis and evaluation of hybrid molecularly imprinted polymers for selective extraction of saccharin in aqueous medium. J Polym Res 28, 40 (2021). https://doi.org/10.1007/s10965-020-02402-z
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DOI: https://doi.org/10.1007/s10965-020-02402-z