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Electrochemically active mercury nanodroplets trapped in a carbon nanoparticle - chitosan matrix

Rassaei, Liza ; Sillanpää, Mika ; Edler, Karen J. LU orcid and Marken, Frank (2009) In Electroanalysis 21(3-5). p.261-266
Abstract

A thin composite film of carbon nanoparticles (ca. 8 nm diameter) and chitosan biopolymer (poly-D-glucosamine, from chitin, 75-85% deacetylated) was prepared by evaporation from aqueous dispersion onto glassy carbon electrode surfaces. The amine groups in the chitosan biopolymer were used to effectively bind Hg(II) ions from an aqueous pH 5 KCl solution. During redox cycling voltammetric responses for bound mercury are readily observed and mercury nanodroplets (ca. 5.4 (± 1.0) nm diameter based on SAXS measurements) are formed in the film by applying a negative potential. The binding of Hg(II) ions to the chitosan-carbon nanoparticle film occurs with an approximate Langmuirian constant of 2.7 × 104... (More)

A thin composite film of carbon nanoparticles (ca. 8 nm diameter) and chitosan biopolymer (poly-D-glucosamine, from chitin, 75-85% deacetylated) was prepared by evaporation from aqueous dispersion onto glassy carbon electrode surfaces. The amine groups in the chitosan biopolymer were used to effectively bind Hg(II) ions from an aqueous pH 5 KCl solution. During redox cycling voltammetric responses for bound mercury are readily observed and mercury nanodroplets (ca. 5.4 (± 1.0) nm diameter based on SAXS measurements) are formed in the film by applying a negative potential. The binding of Hg(II) ions to the chitosan-carbon nanoparticle film occurs with an approximate Langmuirian constant of 2.7 × 104 mol-1dm3 and the process is dependent on (i) the chitosan content in the film, (ii) the Hg 2+ concentration, and (iii) the immobilization time. The immobilized mercury nanodroplets within the carbon nanoparticle - chitosan film are electrochemically active and allow the co-deposition of other metals in the form of amalgams. Preliminary experiments for the anodic stripping voltammetry for Pb2+ and for Cu2+ are demonstrated. Mercury nanodroplet modified chitosan - carbon nanoparticle film electrodes represent a novel electroanalytical tool.

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author
; ; and
publishing date
type
Contribution to journal
publication status
published
keywords
Carbon nanoparticles, Chitosan, Mercury, Nanodroplet, Sensor, Voltammetry
in
Electroanalysis
volume
21
issue
3-5
pages
6 pages
publisher
John Wiley & Sons Inc.
external identifiers
  • scopus:60549105733
ISSN
1040-0397
DOI
10.1002/elan.200804301
language
English
LU publication?
no
id
32a52df8-fbf1-408c-8080-b23b79d9e76d
date added to LUP
2023-05-04 18:45:16
date last changed
2023-06-09 16:02:18
@article{32a52df8-fbf1-408c-8080-b23b79d9e76d,
  abstract     = {{<p>A thin composite film of carbon nanoparticles (ca. 8 nm diameter) and chitosan biopolymer (poly-D-glucosamine, from chitin, 75-85% deacetylated) was prepared by evaporation from aqueous dispersion onto glassy carbon electrode surfaces. The amine groups in the chitosan biopolymer were used to effectively bind Hg(II) ions from an aqueous pH 5 KCl solution. During redox cycling voltammetric responses for bound mercury are readily observed and mercury nanodroplets (ca. 5.4 (± 1.0) nm diameter based on SAXS measurements) are formed in the film by applying a negative potential. The binding of Hg(II) ions to the chitosan-carbon nanoparticle film occurs with an approximate Langmuirian constant of 2.7 × 10<sup>4</sup> mol<sup>-1</sup>dm<sup>3</sup> and the process is dependent on (i) the chitosan content in the film, (ii) the Hg <sup>2+</sup> concentration, and (iii) the immobilization time. The immobilized mercury nanodroplets within the carbon nanoparticle - chitosan film are electrochemically active and allow the co-deposition of other metals in the form of amalgams. Preliminary experiments for the anodic stripping voltammetry for Pb<sup>2+</sup> and for Cu<sup>2+</sup> are demonstrated. Mercury nanodroplet modified chitosan - carbon nanoparticle film electrodes represent a novel electroanalytical tool.</p>}},
  author       = {{Rassaei, Liza and Sillanpää, Mika and Edler, Karen J. and Marken, Frank}},
  issn         = {{1040-0397}},
  keywords     = {{Carbon nanoparticles; Chitosan; Mercury; Nanodroplet; Sensor; Voltammetry}},
  language     = {{eng}},
  number       = {{3-5}},
  pages        = {{261--266}},
  publisher    = {{John Wiley & Sons Inc.}},
  series       = {{Electroanalysis}},
  title        = {{Electrochemically active mercury nanodroplets trapped in a carbon nanoparticle - chitosan matrix}},
  url          = {{http://dx.doi.org/10.1002/elan.200804301}},
  doi          = {{10.1002/elan.200804301}},
  volume       = {{21}},
  year         = {{2009}},
}