title: A reusable naphthalimide-functionalized magnetic fluorescent nanosensor for the simultaneous determination and removal of trace Hg2+ in aqueous solution.
abstract: On the basis of high selective and sensitive interaction of 1,8-naphthalimide with Hg(2+) and the formation of stable neutral imide-Hg-imide complexes, we designed and synthesized a novel magnetic fluorescent sensor (S1) employed Fe(3)O(4) magnetic nanoparticles and 1,8-naphthalimide fluorescent sensor. Under optimum conditions, S1 exhibits the high selectivity toward Hg(2+) over other metal ions, with the detection limit of 1.03×10(-8)M. We demonstrated that a reliable fluorescence response of S1 toward Hg(2+) over a broad pH range (pH=5.0-9.0) could be reused at least four cycles. The maximum sorption capacity of S1 was about 5.6 mg g(-1). In addition, the removal of Hg(2+) in water was achieved by the aggregation-induced sedimentation (AIS) strategy. Moreover, the suspended magnetic nanoparticles could be removed by external magnetic field, and the secondary pollution was avoided. The above-mentioned results indicate that this approach may serve as a foundation of the preparation of the multifunctional magnetic fluorescent sensor for simple, rapid, and simultaneous determination and removal of trace Hg(2+) and other pollutants in environmental samples.
authors.affiliation: School of Resources and Environment, University of Jinan, Jinan 250022, China.
authors.forename: Jie
authors.initials: J
authors.lastname: Zhao
authors.forename: Baocun
authors.initials: B
authors.lastname: Zhu
authors.forename: Haiqin
authors.initials: H
authors.lastname: Yu
authors.forename: Liangguo
authors.initials: L
authors.lastname: Yan
authors.forename: Qin
authors.initials: Q
authors.lastname: Wei
authors.forename: Bin
authors.initials: B
authors.lastname: Du
mesh_terms: D002413:Cations, Divalent / Q000032:analysis / Q000302:isolation & purification; D005456:Fluorescent Dyes / Q000737:chemistry*; D057230:Limit of Detection; D058185:Magnetite Nanoparticles / Q000737:chemistry*; D008628:Mercury / Q000032:analysis / Q000302:isolation & purification*; D053644:Naphthalimides / Q000737:chemistry*; D013050:Spectrometry, Fluorescence / Q000379:methods*; D014867:Water / Q000032:analysis; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods*
chemical_list: D002413:Cations, Divalent; D005456:Fluorescent Dyes; D058185:Magnetite Nanoparticles; D053644:Naphthalimides; D014874:Water Pollutants, Chemical; D014867:Water; D008628:Mercury