Abstract
In this paper, two recyclable nitrite sensing platforms were constructed through a core-shell structure, using Fe3O4 nanoparticles as core, a silica molecular sieve MCM-41 as shell and rhodamine molecules as chemosensor, respectively. This hybrid structure was analyzed using electron microscopy images, porous measurement, magnetic analysis, IR spectra and thermal stability. It was found that emission of these two composite samples was quenchable by nitrite through a static sensing mechanism. Low LOD values were obtained for these two composite samples (1.4 µM). In addition, this static sensing reaction could be reversed by sulphamic acid. These two composite samples could be recycled, showing their recyclability.
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