One pot reduction and functionalization of graphene oxide (GO) with L-cysteine (L-cys-rGO) at the edges and basal planes of the carbon layers are presented. The L-cys-rGO was characterized by X-ray diffraction studies (XRD), X-ray photoelectron spectroscopy (XPS), attenuated infrared spectroscopy (ATIR), and Raman spectroscopy. The surface morphology was studied by scanning electron microscopy (SEM) and transmittance electron microscopy (TEM). The L-cys-rGO was further utilized for the simultaneous electrochemical quantification of environmentally harmful metal ions such as, Cd 2+ , Pb 2+ , Cu 2+ and Hg 2+ . Detection limits obtained for these metal ions were 0.366, 0.416, 0.261 and 1.113 mg L À1 respectively. The linear range obtained for Cd 2+ , Cu 2+ and Hg 2+ was 0.4 to 2.0 mM and for Pb 2+ was 0.4 to 1.2 mM. The detection limits were found to be less than the World Health Organization (WHO) limits.The developed protocol was applied for the determination of the above metal ions in various environmental samples and the results obtained were validated by atomic absorption spectroscopy (AAS).

Herein, we have designed and synthesized highly electocatalytically active 2D MoS2 nanosheets (NS), by a facile hydrothermal method, for hydrogen evolution reaction (HER).

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