Issue 20, 2015

Rapid and selective extraction of multiple sulfonamides from aqueous samples based on Fe3O4–chitosan molecularly imprinted polymers

Abstract

Highly selective magnetic molecularly imprinted polymers (MMIPs) for the adsorption of sulfonamides (SAs) were prepared by surface imprinted technology using active Fe3O4–chitosan (Fe3O4–CS) as the core and a mixture of sulfamethazine (SMZ) and sulfamethoxazole (SMX) as mixed template molecules. The optimum crosslinker types and contents were evaluated based on the analysis of adsorption parameters (Q, Kd and k) and regeneration of the MMIPs. The structure, morphology, magnetism, thermostability, adsorption and recognition properties of the MMIPs were characterized using Fourier transform infrared (FT-IR) spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM), vibrating sample magnetometry (VSM), thermogravimetric analysis (TGA) and re-binding experiments, respectively. The results showed that the superparamagnetic particles with a homogeneous polymer film exhibited the maximum adsorption capacity (Q(SMX) = 4.32 mg g−1; Q(SMZ) = 4.13 mg g−1), good selective recognition of SAs (k(SMX) = 3.52; k(SMZ) = 3.83) and a fast adsorption rate (t = 9 min). Furthermore, molecularly imprinted polymers-magnetic dispersive solid-phase extraction (MIPs-MDSPE) coupled with a HPLC method was developed for the enrichment and determination of seven SAs in five different water samples, with recoveries and relative deviations (RSD) ranging from 85.02 to 102.98% and from 2.77 to 6.47%, respectively. SMX was detected in influent and effluent sewage samples, at concentrations of 112 and 64 ng L−1, respectively.

Graphical abstract: Rapid and selective extraction of multiple sulfonamides from aqueous samples based on Fe3O4–chitosan molecularly imprinted polymers

Article information

Article type
Paper
Submitted
11 Jun 2015
Accepted
24 Aug 2015
First published
25 Aug 2015

Anal. Methods, 2015,7, 8704-8713

Author version available

Rapid and selective extraction of multiple sulfonamides from aqueous samples based on Fe3O4–chitosan molecularly imprinted polymers

S. Qin, L. Su, P. Wang and Y. Gao, Anal. Methods, 2015, 7, 8704 DOI: 10.1039/C5AY01499A

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