Selective Zn (II) chemosensor based on di(2-picolyl)amine functionalized inorganic/organic hybrid magnetic network

• Fe3O4@SiO2–DPA inorganic/organic network has selectivity and sensitivity to Zn (II).
• Fluorescence of hybrid network to Zn (II) can change from colorless to pink-red.
• The network exhibited Zn (II) removal efficiency as high as 97.1%.
• Langmuir linear fitting can illustrate well consistent with the adsorption results.

Di(2-picolyl)amine derivates functionalized inorganic/organic hybrid magnetic network was prepared for selective detection and removal of Zn (II). A significant visual color change from colorless to pink-red was observed under the irradiation of 365 nm UV lamp. The inorganic/organic hybrid Fe3O4@SiO2 nanoparticles were characterized by TEM, XRD, VSM, FT-IR, and TGA techniques. The fluorescence photograph showed that di(2-picolyl)amine functionalized Fe3O4@SiO2 nanoparticles were sensitive and selective to Zn2+ in acetonitrile solution. The di(2-picolyl)amine functionalized Fe3O4@SiO2 nanoparticles with high saturation magnetization can conveniently separate metal ions from aqueous solution. Fluorescence spectra showed that the intensity varied obviously with the concentration of Zn2+. The removal efficiency of Zn2+ can reach as high as 97.1% and the saturated adsorption amount of Zn2+ is 161.6 mg/g. Langmuir linear fitting can illustrate the well consistent with the adsorption results.

The di(2-picolyl)amine functionalized Fe3O4@SiO2 NPs exhibited significant fluorescent change from colorless to pink-red and good adsorption with Zn2+.Figure optionsDownload as PowerPoint slide