Duo-molecularly imprinted polymer-coated magnetic particles for class-selective removal of endocrine-disrupting compounds from aqueous environment

Abstract

The removal of steroid and phenolic endocrine-disrupting compounds (EDCs) from an aqueous environment was investigated using magnetic particles encapsulated by a duo-molecularly imprinted polymer (duo-MIP). The effect of environmental variables on the binding efficiency was studied. Experimental results showed that the amount of EDCs adsorbed was neither affected by up to 10.0 mM NaCl nor significantly interfered by up to 10.0 mg/L humic acid. Negligible influence was observed from pH 3.3 to pH 6.8, but a decrease started at pH 9. Freundlich isotherm parameters indicated binding capacities in the order of DES > E2 ∼ E1 > BPA. The applicability of class-selective removal was verified using river water samples spiked with these EDCs at 10 μg/L; the binding efficiencies were 90, 90, 88, and 98 % for estrone (E1), 17β-estradiol (E2), bisphenol A (BPA), and diethylstilbestrol (DES), respectively. A reuse investigation verified constant binding capacities exhibiting <2 % reduction after seven cycles of regeneration.

Novel molecularly imprinted stir bar sorptive extraction based on an 8-electrode array for preconcentration of trace exogenous estrogens in meat

“…They do not have high selectivity and affinity for a family of analytes. In order to expand the applicability of MIF, imprinting two or more analytes in a single polymer layer is an interesting technology, which can shorten analytical time, save labor and reduce costs [21,22]. Although multiple works have described the removal/ detection of estrogens based on molecular imprinting technique prepared with a single estrogen as template [23,24], the preparation of multi-template MIF using electro-polymerization for simultaneous assessment of two or more estrogens is rarely reported.…”

Evaluation of Non-Imprinted Polymer Particles for Advanced Treatment of Water and Wastewater

“…Their polymers contained a kaolinite/Fe3O4 core which also acted as the monomer for polymerization. Xia et al (2012) prepared molecularly imprinted polymer-encapsulated magnetic particles by ultrasonication assisted synthesis in a mixture of water and organic solvent using dual-layered surfactant-modified magnetic particles as core, 17β-estradiol as template, and methacrylic acid as functional monomer (Xia et al, 2013). used MIP as a surface for adsorption of BPA and its metabolites to increase the concentration and aid biodegradation.…”

“…incorporation of the particles into macroporous cryogels Koç et al, 2011;Plieva et al, 2011); and the creation of MIP with a magnetic core Xia et al, 2012a;Xia et al, 2012b). MIP cryogels contain pores of varying sizes.…”

“…Larger pores allow for a high water flowrate and prevent clogging Le Noir et al, 2009;Koç et al, 2011;Plieva et al, 2011). MIP with a magnetic core can easily be added to water or wastewater in a batch adsorption process and removed with a strong magnet Xia et al, 2012a;Xia et al, 2012b).…”

“…In Chapter 8, removal of MIP and NIP with physical separation processes following treatment was investigated. Previous researchers have investigated the incorporation of MIP into cryogels for application , or the preparation of MIP with magnetic cores which can be separated from solution with the application of a magnetic field Xia et al, 2012a;Xia et al, 2012b), but removal with conventional methods already in use in the water and wastewater industries have not been investigated.…”