Electrochemically active mercury nanodroplets trapped in a carbon nanoparticle - chitosan matrix
(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
- Rassaei, Liza ; Sillanpää, Mika ; Edler, Karen J. LU and Marken, Frank
- publishing date
- 2009-02
- 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}}, }