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

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 Fe 3 O 4 @SiO 2 nanoparticles were characterized by TEM, XRD, VSM, FT-IR, and TGA techniques. The fluorescence photograph showed that di(2-picolyl)amine functionalized Fe 3 O 4 @SiO 2 nanoparticles were sensitive and selective to Zn 2+ in acetonitrile solution. The di(2-picolyl)amine functionalized Fe 3 O 4 @SiO 2 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 Zn 2+ . The removal efficiency of Zn 2+ can reach as high as 97.1% and the saturated adsorption amount of Zn 2+ is 161.6   mg/g. Langmuir linear fitting can illustrate the well consistent with the adsorption results.