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Synthesis of β-cyclodextrin functionalized gold nanoparticles for the selective detection of Pb2+ ions from aqueous solution

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Abstract

In the present study we carried out the synthesis of β-cyclodextrin (β-CD) functionalized gold nanoparticles (AuNPs) using a microwave assisted heating method in alkaline media. Stable dispersion of β-CD stabilized AuNPs was obtained at an optimized pH of 10.5. At this pH value the deprotonated secondary hydroxyl group of β-CD shows the highest chelating affinity toward Pb2+ ions thereby inducing AuNP aggregation. The Pb2+ induced aggregation in β-CD-AuNP solution is monitored by both colorimetric response and UV-Vis spectroscopy. TEM, DLS and FTIR analyses were carried out to confirm the Pb2+ ion induced aggregation behaviour of β-CD-AuNPs under alkaline conditions. Furthermore at the experimental pH the response of the β-CD-AuNP system towards Pb2+ ions is selective when compared with other interfering metal cations.

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Authors and Affiliations

  1. Department of Chemistry, University of Kerala, Kariavattom Campus, Thiruvananthapuram, Kerala, 691021, India

    B. Aswathy, S. Suji & G. Sony

  2. Department of Materials Engineering, Indian Institute of Science, Bangalore, India

    G. S. Avadhani

Authors
  1. B. Aswathy
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  2. G. S. Avadhani
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  3. S. Suji
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  4. G. Sony
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Correspondence to G. Sony.

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Aswathy, B., Avadhani, G.S., Suji, S. et al. Synthesis of β-cyclodextrin functionalized gold nanoparticles for the selective detection of Pb2+ ions from aqueous solution. Front. Mater. Sci. 6, 168–175 (2012). https://doi.org/10.1007/s11706-012-0165-5

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  • DOI: https://doi.org/10.1007/s11706-012-0165-5

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