Electrochemical study of chemically modified and screen-printed graphite electrodes with [(SbO)-O-V(CHL)(2)]Hex. Application for the selective determination of sulfide (Journal article)

Prodromidis, M. I./ Veltsistas, P. G./ Karayannis, M. I.

The preparation and electrochemical characterization of graphite electrodes modified with hexadecylpyridinium-bis(chloranilato)-antimonyl(V), [(SbO)-O-V(CHL)(2)]Hex, (CMEs) as well as their behavior as electrocatalysts toward the oxidation of sulfide are described. The self-exchange rate constant k(0) of immobilized [(SbO)-O-V(CHL)(2)]Hex and the effect of the surface coverage were evaluated. [SbVO(CHL)(2)]Hex is a new compound. Synthesis protocol and some identification studies are given. The fabrication of screen-printed electrodes (SPEs) with a mixture of 5% (w/w) [(SbO)-O-V(CHL)(2)]Hex/graphite powder in 1.5% (w/v) ethyl cellulose in 2-butoxyethyl acetate is also described. SPEs, poised at +0.08 mV versus Ag/AgCl, at pH 6.5 were utilized for the determination of sulfide in simulated wastewater samples. Interference of various compounds was also tested. The proposed method correlates well with a colorimetric method. Calibration graphs were linear over the range 0.01-0.7 mM sodium sulfide and the CV was 2.8% (n = 8) for 0.1 mM sodium sulfide. Recovery ranged from 94 to 102%. Both [(SbO)-O-V(CHL)(2)]Hex CMEs and SPE showed very good storage stability. [SbVO(CHL)(2)]Hex CMEs showed poor working stability in contrast to printed electrodes, which operated with no remarkable loss of their initial activity for more than 100 runs.
Institution and School/Department of submitter: Πανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Χημείας
Keywords: potential sweep voltammogram,hydrogen-sulfide,general expression,sensor
URI: http://olympias.lib.uoi.gr/jspui/handle/123456789/10596
ISSN: 0003-2700
Link: <Go to ISI>://000089178600013
Publisher: American Chemical Society
Appears in Collections:Άρθρα σε επιστημονικά περιοδικά ( Ανοικτά)

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