LAUSR

Abstract The hexavalent Chromium (Chromium (VI) (or) Cr6+) is considered as the most toxic element that directly affects the environment and the human cycle adversely. Therefore, in the present study we proposed a sensitive and selective electrochemical sensor for the detection of Cr6+ in various water samples using graphene carbon nitride decorated with silver molybdate immobilized with nafion (g-C3N4/AgM/Nf) modified glassy carbon electrode (GCE). The nanocomposite was synthesized by sonochemical method and characterized by various analytical and spectroscopic techniques. The g-C3N4/AgM/Nf/GCE was exceptional and showed massive electrocatalytic change via the appearance of peaks in amperometric i-t technique. Cr6+ has a reduction peak appearing at 0.1–0.7 μM, with a low limit of detection of 0.0016 μM, and sensitivity of 65.8 µAµM−1cm−2. The g-C3N4/AgM/Nf/GCE sensor for Cr6+ exhibited a good selectivity, stability, sensitivity, and reproducibility, which certified that the g-C3N4/AgM/Nf/GCE is a promising electrode. The electrochemical sensing method also accessed for the recognition of Cr6+ in different water samples and showed good feasibility with superior recovery.