Abstract
This work was focused on two emissive-magnetic composite samples based on a core-shell structure so that nitrite sensing and recyclability could be both achieved. Fe3O4 particles were used as core, MCM-41 was designed as supporting matrix, two rhodamine derivatives were synthesized as chemosensors, respectively. These two composite samples were analyzed and confirmed by their electron microscopy images, mesoporous isotherms, magnetic response, IR spectra and thermal stability. It was found that the presence of nitrite obviously quenched sample emission, showing LOD of 1.2μM. A static sensing mechanism based on an additive reaction was confirmed by emission decay lifetime analysis. This additive reaction could be reversed by sulphamic acid so that these composite samples could be recovered after nitrite sensing.
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