AUTHOR=Mahadik Manasi , Patil Harshada , Bodkhe Gajanan , Ingle Nikesh , Sayyad Pasha , Al-Gahaouri Theeazen , Shirsat Sumedh M. , Shirsat Mahendra 

TITLE=EDTA Modified PANI/GO Composite Based Detection of Hg (II) Ions

JOURNAL=Frontiers in Materials

VOLUME=Volume 7 - 2020

YEAR=2020

URL=https://www.frontiersin.org/journals/materials/articles/10.3389/fmats.2020.00081

DOI=10.3389/fmats.2020.00081

ISSN=2296-8016

ABSTRACT=Electrochemical recognition of Hg (II) ions utilizing EDTA modified polyaniline (PANI)/Graphene Oxide (GO) composite is reported in the present communication. Graphene Oxide (GO) synthesis was carried out by modified Hummer’s method. Electrochemical characterizations viz. cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) were  done  before  and  after  modification of composite. Topography of PANI/GO composite and EDTA_PANI/GO electrodes was studied using AFM.  Roughness parameter were compared for confirmation of surface modification.  Fourier transform infrared spectroscopy (FTIR) was utilized for the compositional analysis of PANI/GO and EDTA_PANI/GO electrodes. The EDTA_PANI/GO composite shows sensitivity towards Hg (II) ions. It was identified using differential pulse stripping voltammetry (DPSV) technique with lower detection limit of 2 ppb. EDTA modified SS_PANI/GO composite (PANI/GO composite deposited on stainless steel substrate) have shown superior sensitivity in detection of Hg (II) ions. The sensitivity was observed upto 1 ppb which is smaller than maximum contaminant level (MCL) endorsed by Environment Protection Agency (EPA, USA).