Green synthesis of gold nanoparticles for trace level detection of a hazardous pollutant (nitrobenzene) causing Methemoglobinaemia

R. Emmanuel, Chelladurai Karuppiah, Shen Ming Chen, Selvakumar Palanisamy, S. Padmavathy, P. Prakash

    Research output: Contribution to journalArticlepeer-review

    137 Scopus citations

    Abstract

    The present study involves a green synthesis of gold nanoparticles (Au-NPs) using Acacia nilotica twig bark extract at room temperature and trace level detection of one of the hazardous materials, viz. nitrobenzene (NB) that causes Methemoglobinaemia. The synthesis protocol demonstrates that the bioreduction of chloroauric acid leads to the formation of Au-NPs within 10min, suggesting a higher reaction rate than any other chemical methods involved. The obtained Au-NPs have been characterized by UV-vis spectroscopy, X-ray diffraction, transmission electron microscopy, Energy-Dispersive X-ray Spectroscopy and Fourier Transform Infrared Spectroscopy. The electrochemical detection of NB has been investigated at the green synthesized Au-NPs modified glassy carbon electrode by using differential pulse voltammetry (DPV). The Au-NPs modified electrode exhibits excellent reduction ability toward NB compared to unmodified electrode. The developed NB sensor at Au-NPs modified electrode displays a wide linear response from 0.1 to 600μM with high sensitivity of 1.01μAμM-1cm-2 and low limit of detection of 0.016μM. The modified electrode shows exceptional selectivity in the presence of ions, phenolic and biologically coactive compounds. In addition, the Au-NPs modified electrode exhibits an outstanding recovery results toward NB in various real water samples.

    Original languageBritish English
    Pages (from-to)117-124
    Number of pages8
    JournalJournal of Hazardous Materials
    Volume279
    DOIs
    StatePublished - 30 Aug 2014

    Keywords

    • Differential pulse voltammetry
    • Electrocatalysis
    • Gold nanoparticles
    • Green synthesis
    • Nitrobenzene

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