Green Synthesis and Spectroscopic Studies of Ag-rGO Nanocomposites for Highly Selective Mercury (II) Sensing

Author(s): Shubhangi J. Mane-Gavade, Sandip R. Sabale*, Xiao-Ying Yu, Gurunath H. Nikam, Bhaskar V. Tamhankar*.

Journal Name: Nanoscience & Nanotechnology-Asia

Volume 9 , Issue 1 , 2019

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Abstract:

Introduction: Herein we report the green synthesis and characterization of silverreduced graphene oxide nanocomposites (Ag-rGO) using Acacia nilotica gum for the first time.

Experimental: We demonstrate the Hg2+ ions sensing ability of the Ag-rGO nanocomposites form aqueous medium. The developed colorimetric sensor method is simple, fast and selective for the detection of Hg2+ ions in aqueous media in presence of other associated ions. A significant color change was noticed with naked eye upon Hg2+ addition. The color change was not observed for cations including Sr2+, Ni2+, Cd2+, Pb2+, Mg2+, Ca2+, Fe2+, Ba2+ and Mn2+indicating that only Hg2+ shows a strong interaction with Ag-rGO nanocomposites. Under the most suitable condition, the calibration plot (A0-A) against concentration of Hg2+ was linear in the range of 0.1-1.0 ppm with a correlation coefficient (R2) value 0.9998.

Results & Conclusion: The concentration of Hg2+ was quantitatively determined with the Limit of Detection (LOD) of 0.85 ppm. Also, this method shows excellent selectivity towards Hg2+ over nine other cations tested. Moreover, the method offers a new cost effective, rapid and simple approach for the detection of Hg2+ in water samples.

Keywords: Green synthesis, Ag-rGO Nanocomposites, Acacia nilotica gum, Hg2+ sensing, Limit of Detection (LOD).

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Article Details

VOLUME: 9
ISSUE: 1
Year: 2019
Page: [101 - 108]
Pages: 8
DOI: 10.2174/2210681207666170705143629
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