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    The mechanism of sonochemical degradation of a cationic surfactant in aqueous solution

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    18
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    Author
    Singla, R; Grieser, F; Ashokkumar, M
    Date
    2011-03-01
    Source Title
    ULTRASONICS SONOCHEMISTRY
    Publisher
    ELSEVIER
    University of Melbourne Author/s
    Grieser, Franz; Ashokkumar, Muthupandian; SINGLA, RITU
    Affiliation
    Chemistry
    Metadata
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    Document Type
    Journal Article
    Citations
    Singla, R., Grieser, F. & Ashokkumar, M. (2011). The mechanism of sonochemical degradation of a cationic surfactant in aqueous solution. ULTRASONICS SONOCHEMISTRY, 18 (2), pp.484-488. https://doi.org/10.1016/j.ultsonch.2010.09.013.
    Access Status
    This item is currently not available from this repository
    URI
    http://hdl.handle.net/11343/29082
    DOI
    10.1016/j.ultsonch.2010.09.013
    Description

    C1 - Journal Articles Refereed

    Abstract
    The sonochemical degradation of the cationic surfactant, laurylpyridinium chloride (LPC), in water was studied at concentrations of 0.1-0.6 mM, all below its critical micelle concentration (15 mM). It has been found that the initial step in the degradation of LPC occurs primarily by a pyrolysis pathway. Chemical analysis of sonicated solutions by gas chromatography, electrospray mass spectrometry, and high performance liquid chromatography reveals that a broad range of decomposition products, hydrocarbon gases and water-soluble species, are produced. Propionamide and acetamide were identified as two of the degradation intermediates and probably formed as the result of the opening of the pyridinium ring following OH radical addition. Most of the LPC is eventually converted into carboxylic acids. The complete mineralization of these carboxylic acids by sonolysis is however a comparatively slow process due to the hydrophilic nature of these low molecular weight products.
    Keywords
    Physical Chemistry of Materials; Expanding Knowledge in the Chemical Sciences

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