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.

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Keywords Aqueous environment, Class-selective removal, Duo template, Endocrine-disrupting compounds, Magnetic particles, Molecularly imprinted polymer
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Journal Environmental Science and Pollution Research
Xia, X. (Xinlong), Lai, E. P, & Örmeci, B. (2013). Duo-molecularly imprinted polymer-coated magnetic particles for class-selective removal of endocrine-disrupting compounds from aqueous environment. Environmental Science and Pollution Research, 20(5), 3331–3339. doi:10.1007/s11356-012-1262-9