title: Luminescent and magnetic Fe3O4/Py/PAM nanocomposites for the chromium(VI) determination.
abstract: A novel luminescent and magnetic Fe(3)O(4)/pyrene/polyacrylamide (Fe(3)O(4)/Py/PAM) nanocomposite has been prepared under ultrasonic radiation. This magnetic nanocomposite combined with pyrene would lead to a special functional magnetic luminescent composite that enjoys both the advantages of magnetic nanoparticles of Fe(3)O(4) and fluorescence nanoparticles of pyrene. Taking advantage of the magnetic property of Fe(3)O(4) nanocomposites, we can separate Fe(3)O(4)/Py/PAM nanocomposites from solution easily just by using a permanent magnet. Based on the fluorescence quenching of Fe(3)O(4)/Py/PAM nanocomposites by Cr(VI), a method for the selective determination of Cr(VI), without separation of Cr(III) in water, was developed. Under optimal experimental conditions, a limit of detection of 0.01 microg mL(-1) was achieved. The calibration curve was linear over the concentration range of 0.1-14.0 microg mL(-1) with a correlation coefficient of 0.9975. The proposed method has been applied to the selective quantification of Cr(VI) in synthetic samples and wastewater samples with the satisfactory results.
authors.affiliation: College of Chemistry and Materials Science, Anhui Key Laboratory of Functional Molecular Solids, Anhui Normal University, Wuhu 241000, PR China.
authors.forename: Shi
authors.initials: S
authors.lastname: Hong
authors.forename: Hongqi
authors.initials: H
authors.lastname: Chen
authors.forename: Leyu
authors.initials: L
authors.lastname: Wang
authors.forename: Lun
authors.initials: L
authors.lastname: Wang
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry*; D002138:Calibration; D002857:Chromium / Q000032:analysis*; D003102:Colloids; D005290:Ferric Compounds / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D049449:Luminescence; D008280:Magnetics; D046529:Microscopy, Electron, Transmission; D053761:Nanocomposites / Q000737:chemistry* / Q000648:ultrastructure; D011721:Pyrenes / Q000737:chemistry*; D013050:Spectrometry, Fluorescence; D013464:Sulfuric Acids / Q000737:chemistry; D014865:Waste Disposal, Fluid; D014867:Water / Q000737:chemistry; D000099166:Polyacrylamides
chemical_list: D000180:Acrylic Resins; D002857:Chromium; D003102:Colloids; D005290:Ferric Compounds; D011721:Pyrenes; D013464:Sulfuric Acids; D014867:Water; D000099166:Polyacrylamides; C000499:ferric oxide; C030984:pyrene; C033158:sulfuric acid