Electrochemically Active Mercury Nanodroplets Trapped in a Carbon Nanoparticle - Chitosan Matrix
Rassaei, L., Sillanpaa, M., Edler, K. J. and Marken, F., 2009. Electrochemically Active Mercury Nanodroplets Trapped in a Carbon Nanoparticle - Chitosan Matrix. Electroanalysis, 21 (3-5), pp. 261-266.
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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.
|Creators||Rassaei, L., Sillanpaa, M., Edler, K. J. and Marken, F.|
|Uncontrolled Keywords||sensor, chitosan, mercury, nanodroplet, voltammetry, carbon nanoparticles|
|Departments||Faculty of Science > Chemistry|
|Additional Information||Proceedings paper from the 12th International Conference on Electroanalysis. Prague, Czech Republic, 16-19 June 2008|
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