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Abstract
A thin composite film of carbon nanoparticles (ca. 8 run 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 all approximate Langmuirian constant of 2.7 x 10(4) mol(-1) dm(3) and the process is dependent on (i) the chitosan content in the film, (ii) the Hg2+ 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.
Original language | English |
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Pages (from-to) | 261-266 |
Number of pages | 6 |
Journal | Electroanalysis |
Volume | 21 |
Issue number | 3-5 |
DOIs | |
Publication status | Published - Feb 2009 |
Event | 12th International Conference on Electroanalysis - Prague, Czech Republic Duration: 16 Jun 2008 → 19 Jun 2008 |
Bibliographical note
Proceedings paper from the 12th International Conference on Electroanalysis. Prague, Czech Republic, 16-19 June 2008Keywords
- Sensor
- Chitosan
- Mercury
- Nanodroplet
- Voltammetry
- Carbon nanoparticles
Fingerprint
Dive into the research topics of 'Electrochemically Active Mercury Nanodroplets Trapped in a Carbon Nanoparticle - Chitosan Matrix'. Together they form a unique fingerprint.Projects
- 2 Finished
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MICROWAVE-INDUCED NANOSCALE CONVECTION, POLARISATION, AND THERMAL EFFECTS LEADING TO INNOVATIVE ANALYTICAL TECHNOLOGY
Marken, F. (PI)
Engineering and Physical Sciences Research Council
1/09/08 → 29/02/12
Project: Research council
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SAXSESS - SMALL ANGLE X-RAY SCATTERING SYSTEM FOR MATERIALS CHEMISTRY
Edler, K. (PI), Jones, '. (CoI), Marken, F. (CoI), Price, G. (CoI), Roser, S. (CoI) & Weller, A. (CoI)
Engineering and Physical Sciences Research Council
31/01/07 → 30/01/09
Project: Research council