Porphyrin-functionalized Fe3O4@SiO2 core/shell magnetic colorimetric material for detection, adsorption and removal of Hg2+ in aqueous solution

Calcein-functionalized Fe3O4@SiO2 nanoparticles as a reusable fluorescent nanoprobe for copper(II) ion

“…Compared with the spectra of Fig. 2a (a) and a (b), the observed bands appearing at 1,390 and 2,840-2,950 cm −1 correspond to the stretching vibration of the -C-O-C-and C-H groups [17]. The presence of these peaks confirms that the GPTMS was successfully inserted into the silica-coated magnetic nanoparticles.…”

“…The wideangle XRD patterns exhibited multiple peaks corresponding to the signature of Fe 3 O 4 , which is in good agreement with the data for pure cubic Fe 3 O 4 , as reported in the JCPDS card (no. 88-315, a=8.375) [17]. After coating with silica, the XRD pattern ( Fig.…”

“…Among these solid-state probes, magnetic Electronic supplementary material The online version of this article (doi:10.1007/s00604-014-1358-7) contains supplementary material, which is available to authorized users. silica microspheres have attracted much more interest because they can be removed from aqueous solutions by an external magnetic field [17,18,23,24]. Silica is used as a shell because of its relatively easy processing, possibility for functionalization, excellent environmental stability, good compatibility, low cytotoxicity, etc.…”

“…Compared with the methods listed above, the fluorescence method is a more powerful technique for ion detection because of distinct advantages such as facile operation, low cost, high sensitivity and selectivity, and real time and online detection [14][15][16]. However, the most commonly used fluorescence probes have been focused on homogeneous systems in the solution state, which are not recyclable and separable [17,18]. Several previous studies have been devoted to the preparation of solid-state probes formed by grafting small molecules onto nanomaterials, which are promising due to advantages such as reusability, separability, operational simplicity, and portability, which make rapid online detection possible at low cost [19][20][21][22].…”

Design of Multifunctional Fluorescent Hybrid Materials Based on SiO2 Materials and Core–Shell Fe3O4@SiO2 Nanoparticles for Metal Ion Sensing

“…C) A schematic illustration of the preparation of a PPY‐functionalized Fe 3 O 4 @SiO 2 ‐PPY magnetic colorimetric material for the detection, adsorption, and removal of Hg 2+ in aqueous solutions. Reproduced with permission . Copyright 2011, Royal Society of Chemistry.…”