title: A novel voltammetric sensor for sensitive detection of mercury(II) ions using glassy carbon electrode modified with graphene-based ion imprinted polymer.
abstract: In this paper, a novel strategy was proposed to prepare ion-imprinted polymer (IIP) on the surface of reduced graphene oxide (RGO). Polymerization was performed using methacrylic acid (MAA) as the functional monomer, ethylene glycol dimethacrylate (EGDMA) as the cross-linker, 2,2'-((9E,10E)-1,4-dihydroxyanthracene-9,10-diylidene) bis(hydrazine-1-carbothioamide) (DDBHCT) as the chelating agent and ammonium persulfate (APS) as initiator, via surface imprinted technique. The RGO-IIP was characterized by means of Fourier transform infrared spectroscopy (FT-IR), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM) and thermogravimetric analysis (TGA). The electrochemical procedure was based on the accumulation of Hg(II) ions at the surface of a modified glassy carbon electrode (GCE) with RGO-IIP. The prepared RGO-IIP sensor has higher voltammetric response compared to the non-imprinted polymer (NIP), traditional IIP and RGO. The RGO-IIP modified electrode exhibited a linear relationship toward Hg(II) concentrations ranging from 0.07 to 80 μg L(-1). The limit of detection (LOD) was found to be 0.02 μg L(-1) (S/N=3), below the guideline value from the World Health Organization (WHO). The applicability of the proposed electrochemical sensor to determination of mercury(II) ions in different water samples was reported.
authors.affiliation: Young Researchers and Elite Club, Kerman Branch, Islamic Azad University, Kerman, Iran. Electronic address: m.ghaneimotlagh@yahoo.com.
authors.forename: Masoud
authors.initials: M
authors.lastname: Ghanei-Motlagh
authors.affiliation: Department of Chemistry, Faculty of Sciences, Shahid Bahonar University of Kerman, Kerman, Iran.
authors.forename: Mohammad Ali
authors.initials: MA
authors.lastname: Taher
authors.affiliation: Department of Chemistry, Faculty of Sciences, Shahid Bahonar University of Kerman, Kerman, Iran.
authors.forename: Abolfazl
authors.initials: A
authors.lastname: Heydari
authors.affiliation: Department of Pathobiology, Faculty of Veterinary Medicine, Ferdowsi University of Mashhad, Mashhad, Iran.
authors.forename: Reza
authors.initials: R
authors.lastname: Ghanei-Motlagh
authors.affiliation: Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee 247667, India; Department of Applied Chemistry, University of Johannesburg, Johannesburg, South Africa.
authors.forename: Vinod K
authors.initials: VK
authors.lastname: Gupta
mesh_terms: D002244:Carbon / Q000737:chemistry; D055664:Electrochemical Techniques; D004566:Electrodes; D005618:Fresh Water / Q000032:analysis; D006108:Graphite / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007477:Ions / Q000737:chemistry; D057230:Limit of Detection; D008628:Mercury / Q000032:analysis*; D008855:Microscopy, Electron, Scanning; D046529:Microscopy, Electron, Transmission; D054802:Molecular Imprinting; D011108:Polymers / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D013818:Thermogravimetry; D014874:Water Pollutants, Chemical / Q000032:analysis
chemical_list: D007477:Ions; D011108:Polymers; D014874:Water Pollutants, Chemical; D002244:Carbon; D006108:Graphite; D008628:Mercury
keywords: Electrochemical sensor; Graphene oxide; Ion imprinted polymer; Mercury(II); Voltammetry