科研之友
微信
新浪微博
Facebook
分享链接
摘要
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 N-2 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.
