Abstract
AbstractIn this work, employing the Hibiscus rosa sinensis (HRS) flower extract as a green reducer for graphene oxide (GO) reduction and functionalization of rGO using piperazine is proposed. A chemically modified screen‐printed carbon electrode (SPCE) was prepared using piperazine functionalized reduced graphene oxide (P‐rGO). Electroanalytical techniques such as amperometry and differential pulse voltammetry (DPV) were used to investigate the sensing capability of P‐rGO modified SPCE towards the detection of Hg2+ ions. The oxidation peak observed in the cyclic voltammetry was due to the interaction between piperazine (amine) and mercury ions. Piperazine plays a major role in improving the sensitivity of the developed sensor towards mercury cation detection, while the P‐rGO is used as a platform for the incorporation of Hg2+.The developed sensor exhibits a high sensitivity of 0.00327 μA/pM over a wide linear range of 0.2 pM to 2 pM, with a detection limit of 0.0557 pM.
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