کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1265606 972232 2011 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
The mechanism of sonochemical degradation of a cationic surfactant in aqueous solution
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
The mechanism of sonochemical degradation of a cationic surfactant in aqueous solution
چکیده انگلیسی

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.

Research highlights
► Cationic surfactants pollute aqueous environments due to their domestic and industrial use.
► The degradation of a cationic surfactant by means of an effective AOP, sonolysis, has been studied.
► The decomposition of the cationic surfactant occurs primarily by pyrolytic decomposition.
► The mineralization is a slow process due to the hydrophilic nature of the intermediates.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ultrasonics Sonochemistry - Volume 18, Issue 2, March 2011, Pages 484–488
نویسندگان
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