Authors: Mahrouz Alvand Farzaneh Shemirani
Publish Date: 2016/03/17
Volume: 183, Issue: 5, Pages: 1749-1757
Abstract
The authors describe the synthesis of coreshell structured Fe3O4graphene oxide nanospheres denoted as Fe3O4GO NSs via a chemical covalent bonding method A chemical method was applied to cutting graphene oxide flakes into GO nanosheets These were then covalently immobilized onto the surface of magnetite Fe3O4 nanoparticles The material was characterized by TEM SEM EDX FTIR vibrating sample magnetometry and Raman spectroscopy The data confirmed the coexistence of Fe3O4 and GO nanosheets with a coreshell structure The Fe3O4GO NSs were applied to ferrofluidbased dispersive solid phase extraction of cadmiumII as a model analyte using an ionic liquid carrier This sorbent possesses as large contact surface area and a high density of polar groups on its surface The nanoparticles when finely dispersed in the sample solution result in almost complete extraction of CdII within a few seconds CdII was then quantified by FAAS Under optimized conditions the assay has the following features a A detection limit of 012 ng mL−1 b a preconcentration factor of 250 c a relative standard deviation of 14 at a level of 50 ng mL−1 for n = 10 d a linear analytical range extending from 04 to 150 ng mL−1 e a maximal adsorption capacity of 337 mg g−1 and e a well expressed Langmuir adsorption isotherm
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