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Synthesis and characterization of gold nanoparticles incorporated bentonite clay for electrocatalytic sensing of arsenic(III)

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Abstract

In the present manuscript, a simple and easy route to synthesize bentonite (bt) clay-supported gold nanoparticles (Au NPs) is reported (represented as Au-bt). Application of this new environmentally benign material in electrocatalytic determination of arsenite (As(III)) was studied. The successful synthesis and incorporation of Au NPs into the bt clay is supported by spectroscopic, microscopic and electrochemical methods. The synthesized Au-bt material was used to modify glassy carbon electrode (GC) by the evaporation of Au-bt aqueous suspension dropped on the surface of the GC (GC/Au-bt). Cyclic voltammetry and chronoamperometry studies of As(III) solutions were performed with this GC/Au-bt electrode which act as efficient platform for the electro-oxidation of As(III) to As(V) at a very low overpotential. Kinetic parameters were evaluated for the oxidation of As(III) at the GC/Au-bt platforms. A wide linear calibration range for the determination of As(III) from 1 to 1700 μM was obtained with high reproducibility and stability. A limit of detection, 0.1 μM was achieved with high sensitivity. Additionally, it showed a good selectivity for the determination of As(III) in the presence of copper(II) and other interfering ions suggesting a promising new route for trace level determination of As(III) in neutral conditions.

Bentonite clay supported, gold nanoparticle-based, biocompatible material was synthesized (represented as Au-bt) and it shows remarkable elecrocatalytic activity for As(III) oxidation. Based on the electrocatalytic activity of synthesized Au-bt material, As(III) determination is demonstrated in neutral electrolyte solution.

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Acknowledgements

UGC (42-271/2013 (SR)) and CSIR (01(2708)/13/ EMR-II), New Delhi, India are gratefully acknowledged for the financial support. PKR acknowledges CSIR for the senior research fellowship. We are thankful to Prof. C. Retna Raj for useful suggestions, Prof. O. N. Srivastava for TEM and SEM facilities and Prof. S. A. John for EDAX and useful suggestions.

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Authors and Affiliations

  1. Department of Chemistry, Center of Advanced Study, Faculty of Science, Banaras Hindu University, Varanasi, 221 005, UP, India

    PANKAJ KUMAR RASTOGI, DHARMENDRA KUMAR YADAV, SHRUTI PANDEY, VELLAICHAMY GANESAN, PIYUSH KUMAR SONKAR & RUPALI GUPTA

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  1. PANKAJ KUMAR RASTOGI
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  2. DHARMENDRA KUMAR YADAV
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  3. SHRUTI PANDEY
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  4. VELLAICHAMY GANESAN
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  5. PIYUSH KUMAR SONKAR
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Corresponding author

Correspondence to VELLAICHAMY GANESAN.

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Supplementary Information

Additional information such as EDAX of Au-bt (figure S1), CV responses of GC/Au-bt ESP at different scan rates (figure S2), Nyquist plots for GC/Au-bt ESP in the absence and presence of As(III) (figure S3), CV responses obtained for As(III) in presence of Cu(II) at GC/Au-bt ESP (figure S4) and comparison of analytical characteristics (table S1) are given in the supplementary information. The electronic supplementary information is available at www.ias.ac.in/chemsci.

Dedicated to Prof. R. Ramaraj on the occasion of his 60th birth anniversary.

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RASTOGI, P.K., YADAV, D.K., PANDEY, S. et al. Synthesis and characterization of gold nanoparticles incorporated bentonite clay for electrocatalytic sensing of arsenic(III). J Chem Sci 128, 349–356 (2016). https://doi.org/10.1007/s12039-016-1039-7

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  • DOI: https://doi.org/10.1007/s12039-016-1039-7

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