Abstract
A colorimetric and ‘‘turn-on” fluorescent chemosensor Rho-Fe 3O 4@SiO 2 for Hg 2+ in which N-(rhodamine-6G)lactam-ethylenediamine (Rho-en) is conjugated with the magnetic core–shell Fe 3O 4@SiO 2 NPs has been strategically designed and synthesized. The final product was characterized by X-ray power diffraction (XRD), transmission electron microscopy (TEM), Fourier transform infrared spectra (FTIR) and UV–visible absorption and fluorescence emission. Fluorescence and UV–visible spectra results showed that the resultant multifunctional nanoparticles Rho-Fe 3O 4@SiO 2 exhibited selective ‘turn-on’ type fluorescent enhancements and distinct color changes with Hg 2+. The selectivity of the Rho-Fe 3O 4@SiO 2 for Hg(II) ion is better than that of the Rho-en in the same conditions. In addition, the presence of magnetic Fe 3O 4 nanoparticles in the sensor Rho-Fe 3O 4@SiO 2 NPs would also facilitate the magnetic separation of the Hg(II)–Rho-Fe 3O 4@SiO 2 from the solution.
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