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Issue 67, 2017, Issue in Progress
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Nickel tungstate–graphene nanocomposite for simultaneous electrochemical detection of heavy metal ions with application to complex aqueous media

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Abstract

We show for the first time that a composite of carbon and binary transition metal oxide, in the form of a reduced graphene oxide and nickel tungstate (RGO/NiWO4) nanocomposite, is an effective material for electrochemical heavy metal ions detection. The multivalent electronic states of this composite show well-defined peaks of Cd(II), Pb(II), Cu(II) and Hg(II) during simultaneous detection, which is otherwise not observed for NiWO4 NPs and RGO sheets. Simultaneous and selective detection of heavy metal ions in drinking water as well as in complex aqueous media such as carbonated drinks, milk and fruit juices has been successfully demonstrated. Differential pulse anodic stripping voltammetric (DPASV) method was adopted for detection because it partially suppresses the background current and improves signal which leads to a low limit of detection (LOD) when compared to linear sweep voltammetry (LSV). LOD for Cd(II), Pb(II), Cu(II) and Hg(II) ions were found to be 4.7 × 10−10 M, 3.8 × 10−10 M, 4.4 × 10−10 M and 2.8 × 10−10 M for individual detection and 1.0 × 10−10, 1.8 × 10−10, 2.3 × 10−10 and 2.8 × 10−10 M, for simultaneous detection, respectively. The effect of deposition time and deposition potential on the sensing parameter was studied in acetate buffer (pH = 5.0). The better sensitivity with the high capacitive current along with individual and simultaneous electrochemical detection of RGO/NiWO4 nanocomposite is mainly attributed to its large surface area, good electronic conductivity, and better electron transport properties which lead to better catalytic response towards the heavy metal ions detection.

Graphical abstract: Nickel tungstate–graphene nanocomposite for simultaneous electrochemical detection of heavy metal ions with application to complex aqueous media

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Publication details

The article was received on 21 Jul 2017, accepted on 25 Aug 2017 and first published on 29 Aug 2017


Article type: Paper
DOI: 10.1039/C7RA08047F
RSC Adv., 2017,7, 42146-42158
  • Open access: Creative Commons BY license
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    Nickel tungstate–graphene nanocomposite for simultaneous electrochemical detection of heavy metal ions with application to complex aqueous media

    R. Kumar, T. Bhuvana and A. Sharma, RSC Adv., 2017, 7, 42146
    DOI: 10.1039/C7RA08047F

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