title: Green synthesis of gold nanoparticles for trace level detection of a hazardous pollutant (nitrobenzene) causing Methemoglobinaemia.
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(-1)cm(-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.
authors.affiliation: Post Graduate and Research Department of Chemistry, Thiagarajar College, Madurai 625009, Tamil Nadu, India.
authors.forename: R
authors.initials: R
authors.lastname: Emmanuel
authors.affiliation: Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, Taipei 106, Taiwan, ROC.
authors.forename: Chelladurai
authors.initials: C
authors.lastname: Karuppiah
authors.affiliation: Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, Taipei 106, Taiwan, ROC. Electronic address: smchen78@ms15.hinet.net.
authors.forename: Shen-Ming
authors.initials: SM
authors.lastname: Chen
authors.affiliation: Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, Taipei 106, Taiwan, ROC.
authors.forename: Selvakumar
authors.initials: S
authors.lastname: Palanisamy
authors.affiliation: Department of Zoology and Microbiology, Thiagarajar College, Madurai 625009, Tamil Nadu, India.
authors.forename: S
authors.initials: S
authors.lastname: Padmavathy
authors.affiliation: Post Graduate and Research Department of Chemistry, Thiagarajar College, Madurai 625009, Tamil Nadu, India. Electronic address: kmpprakash@gmail.com.
authors.forename: P
authors.initials: P
authors.lastname: Prakash
mesh_terms: D000045:Acacia / Q000737:chemistry; D004566:Electrodes; D006046:Gold / Q000737:chemistry*; D015386:Hazardous Substances / Q000032:analysis* / Q000633:toxicity*; D053768:Metal Nanoparticles / Q000737:chemistry*; D008708:Methemoglobinemia / Q000139:chemically induced*; D009578:Nitrobenzenes / Q000032:analysis* / Q000633:toxicity*; D024301:Plant Bark / Q000737:chemistry; D015203:Reproducibility of Results
chemical_list: D015386:Hazardous Substances; D009578:Nitrobenzenes; D006046:Gold; C036077:nitrobenzene
keywords: Differential pulse voltammetry; Electrocatalysis; Gold nanoparticles; Green synthesis; Nitrobenzene