期刊
ELECTROANALYSIS
卷 21, 期 3-5, 页码 261-266出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/elan.200804301
关键词
Carbon nanoparticles; Chitosan; Mercury; Nanodroplet; Voltammetry; Sensor
资金
- EPSRC [EP/E024904/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/E024904/1] Funding Source: researchfish
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.
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