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Issue 8, 2019
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A versatile strategy to fabricate magnetic dummy molecularly imprinted mesoporous silica particles for specific magnetic separation of bisphenol A

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Abstract

Novel magnetic dummy molecularly imprinted mesoporous silica particles (m-DMIMSP) were prepared using a hybrid dummy imprinting approach combined with magnetic nanoparticles to obtain a magnetic material highly selective towards bisphenol A (BPA). The structure and morphology of synthesized m-DMIMSP were characterized by transmission electron microscopy, scanning electron microscopy, X-ray photoelectron spectroscopy, vibrating sample magnetometry, X-ray diffraction and N2 sorption analysis. The results showed that m-DMIMSP exhibited a mesoporous structure and favorable magnetic properties with saturation magnetization of 4.87 emu g−1. More importantly, m-DMIMSP displayed fast binding kinetics, high rebinding capacity of 76.8 mg g−1, excellent imprint factor of 4.9 and extremely high selectivity towards BPA over 4,4′-biphenol, diethylstilbestrol and hydroquinone, with selectivity coefficients all above 3.80. Moreover, the adsorptive capacity of m-DMIMSP was 2.0, 4.6 and 4.9 times higher than those of controlled magnetic molecularly imprinted mesoporous silica particles, magnetic dummy non-imprinted mesoporous silica particles and magnetic non-imprinted mesoporous silica particles, respectively, thus indicating the superiority of dummy molecular imprinting. Theoretical analysis showed that the experimental data fitted well to the pseudo-second-order model and Langmuir adsorption isotherm, indicating that chemical adsorption might be the rate-limiting step. Furthermore, the high adsorptive capacity and selectivity of m-DMIMSP remained almost constant after 8 runs. Finally, water samples were successfully analyzed with m-DMIMSP and high recoveries in the range of 95.6–106.2% were obtained. Overall, these results demonstrate that m-DMIMSP possesses great potentials for rapid and highly effective extraction of BPA from water samples.

Graphical abstract: A versatile strategy to fabricate magnetic dummy molecularly imprinted mesoporous silica particles for specific magnetic separation of bisphenol A

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Publication details

The article was received on 28 Nov 2018, accepted on 22 Jan 2019 and first published on 23 Jan 2019


Article type: Paper
DOI: 10.1039/C8NJ06027D
Citation: New J. Chem., 2019,43, 3400-3408

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    A versatile strategy to fabricate magnetic dummy molecularly imprinted mesoporous silica particles for specific magnetic separation of bisphenol A

    Y. Wang, M. Tian, K. Yu, L. Li, Z. Zhang and L. Li, New J. Chem., 2019, 43, 3400
    DOI: 10.1039/C8NJ06027D

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