title: Rhodamine functionalized magnetic core-shell nanocomposite: an emission "Off-On" sensing system for mercury ion detection and extraction.
abstract: This paper reported a core-shell structured composite with superparamagnetic ferroferric oxide as the inner core and silica molecular sieve as the outer shell. A rhodamine based sensing dye was covalently grafted into the highly ordered tunnels of silica molecular sieve, so that mercury ion sensing and extraction could be achieved from this composite. This probe loaded core-shell structure was characterized by electron microscopy images, X-ray diffraction patterns, infrared spectra, thermogravimetry and N2 adsorption/desorption measurement. This composite showed increased emission with increasing mercury ion concentration, along with high sensitivity and good selectivity. Linear response and good regenerating performance were also observed from this composite.
authors.affiliation: Jiangnan University, Wuxi 214122, PR China. Electronic address: yijunh891@163.com.
authors.forename: Lei
authors.initials: L
authors.lastname: Shen
authors.affiliation: Jiangnan University, Wuxi 214122, PR China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Wu
authors.affiliation: Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, PR China.
authors.forename: Wuze
authors.initials: W
authors.lastname: Ma
mesh_terms: D000327:Adsorption; D004492:Edetic Acid / Q000737:chemistry; D005290:Ferric Compounds / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007477:Ions; D009682:Magnetic Resonance Spectroscopy; D008280:Magnetics; D008628:Mercury / Q000032:analysis; D053761:Nanocomposites / Q000737:chemistry*; D036103:Nanotechnology; D009584:Nitrogen / Q000737:chemistry; D055095:Optics and Photonics; D011312:Pressure; D012235:Rhodamines / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry; D013055:Spectrophotometry, Infrared; D013696:Temperature; D013818:Thermogravimetry; D014961:X-Ray Diffraction
chemical_list: D005290:Ferric Compounds; D007477:Ions; D012235:Rhodamines; C000499:ferric oxide; D012822:Silicon Dioxide; D004492:Edetic Acid; D008628:Mercury; D009584:Nitrogen
keywords: Fe(3)O(4) nanoparticles; Hg(II); Linear response; Rhodamine derivative; Sensor; Stern–Volmer plot