Abstract
The present paper constructed an organic–inorganic hybrid composite with core–shell structure for Hg(II) sensing, where superparamagnetic ferroferric oxide and silica molecular sieve MCM-41 were used as the inner core and the outer shell, respectively. A rhodamine derivative was firstly modified by sulfur substitution and then covalently connected to MCM-41 tunnels. This composite was supposed to recognize and extract Hg(II) ions. Electron microscopy images, X-ray diffraction analysis, IR spectra, thermogravimetry and N2 adsorption/desorption analysis were performed on this composite, which confirmed its structure. It was found that emission of this composite increased with increasing Hg(II) concentrations, showing emission “off–on” effect. High selectivity, linear working curve and good recycling performance were obtained from this composite.
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