Journal
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
Volume 18, Issue 6, Pages 1763-1771Publisher
SPRINGER
DOI: 10.1007/s10008-014-2414-2
Keywords
Electrochemical; Conductive polymers; Multiwalled carbon nanotubes; Benzaldehyde; Solid-phase microextraction; Gas chromatography
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Funding
- Tehran University of Medical Sciences, Tehran, Iran
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In this work, polyaniline, polypyrrole, and polyaniline/polypyrrole composite fibers were synthesized in the absence and presence of oxidized multiwalled carbon nanotubes using electrochemical cyclic voltammetry with CF3COOH as dopant. Thermal stability of these fibers was studied by differential scanning calorimetry. Then, headspace solid-phase microextraction process coupled with gas chromatography and flame ionization detector was used for comparing extraction capability of benzaldehyde from aqueous solution. Since polyaniline fiber showed better extraction efficiency than the other fibers, its preparation conditions including acid concentration, aniline concentration, scan rate, and amount of multiwalled carbon nanotubes were studied by means of the one-factor-at-a-time method. The analytical performance of polyaniline fibers were investigated to determine benzaldehyde from the aqueous solution. The morphology and texture of polyaniline fibers were examined by field emission scanning electron microscopy and Fourier transform infrared spectroscopy analyses. The attained results revealed that the perfect conditions for acid concentration, aniline concentration, scan rate, and multiwalled carbon nanotubes content were 0.5 M, 0.2 M, 25 mV s(-1), and 0.02 wt%, respectively. The limit of detection for the proposed polyaniline fiber was 15 ng ml(-1).
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