Synthesis, characterization and performance of an emissive-magnetic composite structure for metal ion recognition and removal

Abstract This work was devoted to the synthesis and performance characterization of a composite platform for Hg(II) optical sensing and magnetic removal. There was a core-shell structure in this composite platform, using superamagnetic Fe3O4 as core, silica molecular sieve MCM-41 as shell, respectively. Two rhodamine derivatives were synthesized and covalently grafted into MCM-41 layer, serving as chemosensors. These composite samples were characterized with electron microscopy images, XRD analysis, IR comparison, thermogravimetry and N2 adsorption/desorption analysis, which finally confirmed their core-shell structure. These composite samples showed emission turn on effect towards Hg(II) with good selectivity. Linear sensing curves were obtained. Hg(II) removal and recyclability were realized.