A robust nitrobenzene electrochemical sensor based on chitin hydrogel entrapped graphite composite

Rajalakshmi Sakthivel, Selvakumar Palanisamy, Shen Ming Chen, Sukanya Ramaraj, Vijayalakshmi Velusamy, Pan Yi-Fan, James M. Hall, Sayee Kannan Ramaraj

    Research output: Contribution to journalArticlepeer-review

    17 Scopus citations


    An amperometric nitrobenzene (NB) sensor has been developed based on a glassy carbon electrode (GCE) modified with the composite of chitin hydrogel stabilized graphite (GR-CHI) composite. The physicochemical characterization confirmed the formation of GR-CHI composite and was formed by the strong interaction between GR and CHI. Furthermore, GR-CHI composite modified GCE was used to study the electrochemical reduction behavior of NB by cyclic voltammetry (CV) and compared with GR and CHI modified GCEs. The CV results confirmed that GR-CHI composite modified electrode has high catalytic ability and lower reduction potential toward NB than other modified electrodes due to the combined unique properties of exfoliated GR and CHI. The GR-CHI composite modified electrode can be able to detect the NB in the linear response range from 0.1 to 594.6 µM with the lower detection limit of 37 nM by amperometric i–t method. The selectivity of the sensor is evaluated in the presence of nitroaromatic, biologically active and dihydroxybenzene compounds. The sensor shows appropriate practicality and good repeatability toward detection of NB in lab water samples.

    Original languageBritish English
    Pages (from-to)663-668
    Number of pages6
    JournalJournal of the Taiwan Institute of Chemical Engineers
    StatePublished - Nov 2017


    • Amperometry
    • Chitin hydrogel
    • Electro-reduction
    • Exfoliated graphite
    • Nitrobenzene


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