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Magnetic core–shell nanoparticles coated with a molecularly imprinted organogel for organophosphate hydrolysis

  • Original Paper: Sol-gel and hybrid materials for catalytic, photoelectrochemical and sensor applications
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Abstract

Catalytic core–shell nanoparticles were obtained by coating an iron oxide core with a hybrid organic–inorganic silica shell using vinyl-triethoxy-silane and amino-propyl-triethoxy-silane. The amino group was further functionalised with arginine, used as catalytic moiety for the inactivation of organophosphate pesticides through hydrolysis. By exploiting the vinyl groups of the organosilica as anchorage, an additional outer layer made by molecularly imprinted organogel was built up through high-dilution radical polymerisation. The resulting organogel contains the imprinting complex, which derives from the guanidinium groups of the arginine and the organophosphate used as molecular template. The removal of the organophosphate from the imprinted cavities allowed obtaining core–shell magnetic nanoparticles with a molecularly imprinted acrylamide-based outer layer. These nanoparticles are capable of hydrolysing the commercial pesticide Paraoxon with a reaction rate 50 % faster than the corresponding background hydrolysis.

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Acknowledgments

The Sardinian Regional Government (R.A.S.) is kindly acknowledged for funding D.C. through P.O.R. SARDEGNA F.S.E. 2007–2013—Obiettivo competitività regionale e occupazione, Asse IV Capitale umano, Linea di Attività 3.1.

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Authors and Affiliations

  1. Laboratorio di Scienza dei Materiali e Nanotecnologie, LMNT - D.A.D.U., CR-INSTM, Università di Sassari, Palazzo Pou Salit, Piazza Duomo 6, 07041, Alghero, Sassari, Italy

    Davide Carboni, Barbara Lasio, Luca Malfatti & Plinio Innocenzi

Authors
  1. Davide Carboni
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  2. Barbara Lasio
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  3. Luca Malfatti
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  4. Plinio Innocenzi
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Correspondence to Davide Carboni.

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Carboni, D., Lasio, B., Malfatti, L. et al. Magnetic core–shell nanoparticles coated with a molecularly imprinted organogel for organophosphate hydrolysis. J Sol-Gel Sci Technol 79, 395–404 (2016). https://doi.org/10.1007/s10971-016-4105-1

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  • DOI: https://doi.org/10.1007/s10971-016-4105-1

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