Facile synthesis of magnetic fluorescent nanoparticles: Adsorption and selective detection of Hg(II) in water

Lei Li, Chao Jia, Feijun Wang, Honglei Fan, Weizhou Jiao, Ziqiang Shao*

*Corresponding author for this work

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Abstract

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

Original languageEnglish
Pages (from-to)2360-2369
Number of pages10
JournalJournal of Materials Chemistry C
Volume6
Issue number9
DOIs
Publication statusPublished - 2018

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Li, L., Jia, C., Wang, F., Fan, H., Jiao, W., & Shao, Z. (2018). Facile synthesis of magnetic fluorescent nanoparticles: Adsorption and selective detection of Hg(II) in water. Journal of Materials Chemistry C, 6(9), 2360-2369. https://doi.org/10.1039/c7tc05564a