Ternary nanocomposite-based smart sensor: Reduced graphene oxide/polydopamine/alanine nanocomposite for simultaneous electrochemical detection of Cd 2+ , Pb 2+ , Fe 2+ , and Cu 2+ ions

Heavy metal ion (HMI) sensors are the most sought commercial devices for environmental monitoring and food analysis research due to serious health concerns associated with HMI overdosage. Herein, we developed an effective electrochemical sensor for simultaneous detection of four HMI (Cd , Pb , Fe ,...

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Bibliographic Details
Published in:Environmental research 2023-03, Vol.221, p.115317
Main Authors: Patel, Monika, Bisht, Neha, Prabhakar, Priyanka, Sen, Raj Kumar, Kumar, Pradip, Dwivedi, Neeraj, Ashiq, Mohammad, Mondal, D P, Srivastava, Avanish Kumar, Dhand, Chetna
Format: Article
Language:English
Subjects:
Cadmium - analysis
Carbon - chemistry
Electrochemical Techniques - methods
Lead
Nanocomposites - chemistry
Oxides - chemistry
Water
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Summary:Heavy metal ion (HMI) sensors are the most sought commercial devices for environmental monitoring and food analysis research due to serious health concerns associated with HMI overdosage. Herein, we developed an effective electrochemical sensor for simultaneous detection of four HMI (Cd , Pb , Fe , and Cu ) using a ternary nanocomposite of reduced graphene oxide functionalized with polydopamine and alanine (ALA/pDA/rGO). Comprehensive spectroscopic and microscopic characterizations were performed to ensure the formation of the ternary nanocomposite. The developed nanocomposite on glassy carbon electrode (GCE) yields >2-fold higher current than GO/GCE electrode with excellent electrochemical stability and charge transfer rate. Using DPV, various chemical and electrochemical parameters, such as supporting electrolyte, buffer pH, metal deposition time, and potential, were optimized to achieve highly sensitive detection of targeted HMI. For Cd , Pb , Fe , and Cu sensing devised sensor exhibited detection limits of 1.46, 2.86, 50.23, and 17.95 ppb and sensitivity of 0.0929, 0.0744, 0.0051, and 0.0394 μA/ppb, respectively, with
ISSN:1096-0953