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Facile Synthesis of Magnetic Fluorescent Nanoparticles: Adsorption and Selective Detection of Hg(II) in Water

Abstract

An adsorbent-chemosensor system based on magnetic fluorescent nanoparticles (MFNPs) is successfully constructed via high-gravity technology and self-assembly approach, which adopts magnetic Fe3O4 nanoparticles as core, chitosan (CS) as shell, and carbon quantum dots (CQDs) as the fluorescent probe. The adsorbent-chemosensor possesses a 10 nm average diameter and narrow size distribution, as well as superparamagnetic properties, well-defined pore structure, and superior fluorescent emission intensity. As an adsorbent, the core-shell nanocomposites provide relatively high adsorption capacity to heavy metal ions, and show a maximum monolayer adsorption capacity of 110.62 mg Hg(II) per gram of adsorbent due to the synergistic interaction from the high porosity of the core-shell structure, and the high affinity of Hg(II)-Fe3O4 or Hg(II)-CS interactions. As the fluorescent probe, the as-prepared hybrid nanospheres exhibit favorable sensitivity and detection limit (12.43 nM) toward Hg(II). The nanocomposites also demonstrate excellent reusability with less than 13% loss of adsorption amount and 5% loss of fluorescence intensity after five regeneration test cycles. This present work provides a potential approach for the design of novel and cheap adsorbent-chemosensor for application in Hg(II) recognition and elimination from water.

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Publication details

The article was received on 04 Dec 2017, accepted on 12 Jan 2018 and first published on 12 Jan 2018


Article type: Paper
DOI: 10.1039/C7TC05564A
Citation: J. Mater. Chem. C, 2018, Accepted Manuscript
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    Facile Synthesis of Magnetic Fluorescent Nanoparticles: Adsorption and Selective Detection of Hg(II) in Water

    L. Li, C. jia, F. Wang, H. Fan, W. jiao and Z. Shao, J. Mater. Chem. C, 2018, Accepted Manuscript , DOI: 10.1039/C7TC05564A

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