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

[ Vol. 9 , Issue. 1 ]

Author(s):

Shubhangi J. Mane-Gavade, Sandip R. Sabale*, Xiao-Ying Yu, Gurunath H. Nikam and Bhaskar V. Tamhankar*   Pages 101 - 108 ( 8 )

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).

Affiliation:

P.G. Department of Chemistry, Jaysingpur College, Jaysingpur-416101 (M.S.), P.G. Department of Chemistry, Jaysingpur College, Jaysingpur-416101 (M.S.), Earth and Biological Sciences Directorate, Pacific Northwest National Laboratory (PNNL), Richland, WA 99352, P.G. Department of Chemistry, Jaysingpur College, Jaysingpur-416101 (M.S.), P.G. Department of Chemistry, Jaysingpur College, Jaysingpur-416101 (M.S.)

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