title: The construction, characterization, Hg(II)-sensing and removal behavior of magnetic core-shell nanospheres loaded with fluorescence "Off-On" probe.
abstract: The present paper constructed and discussed core-shell structured nanospheres grafted with rhodamine based probe for Hg(II) sensing and removal. Electron microscopy images, XRD curves, thermogravimetric analysis and N2 adsorption/desorption isotherms were used to identify the core-shell structure. The inner core consisted of superparamagnetic Fe3O4 nanoparticles, which made the nanocomposite magnetically removable. The outer shell was constructed with silica molecular sieve which provided large surface area and ordered tunnels for the sensing probe, accelerating analyte adsorption and transportation. The rhodamine based sensing probe emission increased with the increasing Hg(II) concentration, showing emission "Off-On" effect, which could be explained by the structural transformation from a non-emissive one to a highly emissive one. The influence from various metal ions and pH values was also investigated, which suggested this structural transformation could only be triggered by Hg(II), showing high selectivity and linear response. The Hg(II) sensing nanocomposite could be regenerated after usage. The response time was slightly compromised and could be further improved.
authors: College of Biological and Chemical Engineering, Jiaxing University, Jiaxing 314001, PR China. Electronic address: tanjun_zjxu@163.com.
authors: Jun
authors: J
authors: Tan
authors: Department of Chemical and Textile Engineering, Nanhu College, Jiaxing University, Jiaxing 314001, PR China.
authors: Xiaoyan
authors: X
authors: Wei
authors: College of Biological and Chemical Engineering, Jiaxing University, Jiaxing 314001, PR China.
authors: Jie
authors: J
authors: Chen
authors: College of Biological and Chemical Engineering, Jiaxing University, Jiaxing 314001, PR China.
authors: Ping
authors: P
authors: Sun
authors: Department of Chemical and Textile Engineering, Nanhu College, Jiaxing University, Jiaxing 314001, PR China.
authors: Yuxia
authors: Y
authors: Ouyang
authors: Zhejiang Provincial Key Laboratory of Water Science and Technology, Department of Environment in Yangtze Delta Region Institute of Zhejiang, Jiaxing 314006, PR China.
authors: Juhong
authors: J
authors: Fan
authors: Zhejiang Provincial Key Laboratory of Water Science and Technology, Department of Environment in Yangtze Delta Region Institute of Zhejiang, Jiaxing 314006, PR China.
authors: Rui
authors: R
authors: Liu
mesh_terms: D000327:Adsorption; D005453:Fluorescence; D005456:Fluorescent Dyes / Q000737:chemistry*; D008280:Magnetics; D058185:Magnetite Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D008628:Mercury / Q000032:analysis* / Q000302:isolation & purification; D054118:Nanospheres / Q000737:chemistry / Q000648:ultrastructure; D012235:Rhodamines / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000302:isolation & purification; D018508:Water Purification
chemical_list: D005456:Fluorescent Dyes; D058185:Magnetite Nanoparticles; D012235:Rhodamines; D014874:Water Pollutants, Chemical; D008628:Mercury
keywords: Fe(3)O(4) nanoparticles; Hg(II); Rhodamine derivative; Sensor