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Gewählte Publikation:

Rehorek, A; Hoffmann, P; Kandelbauer, A; Gübitz, GM.
(2007): Sonochemical substrate selectivity and reaction pathway of systematically substituted azo compounds.
Chemosphere. 2007; 67(8):1526-1532 FullText FullText_BOKU

Abstract:
The sonochemical degradation of the systematically substituted azo compound 2,7-dihydroxy-1-phenylazonaphthaline-3,6-disulfonic acid was investigated using a frequency of 850 kHz and an acoustic input power of 61 W. All derivatives were degraded completely within 6 h by the ultrasonic treatment. Trifluoromethyl substituted azo compounds exhibited 2-3-fold higher degradation rates in comparison to the reference hydrogen substituted azo compound (k = 0.54 h(-1)). In contrast to enzymatic processes (azoreductase or laccase), the ultrasonic treatment for these ortho-, meta-, and para-substituted azo compound showed 1.5-50-fold higher degradation rates. Additionally the ultrasound treatment was characterized by shorter reaction times. As a result of the detection and identification of specific intermediates using LGMS a reaction pathway of the sonochemical degradation of the analysed azo compound is proposed indicating the formation of cyclohexadienone and naphthalene quinone derivatives. (c) 2006 Elsevier Ltd. All rights reserved.
Autor*innen der BOKU Wien:
Gübitz Georg
BOKU Gendermonitor:

Find related publications in this database (using NML MeSH Indexing)
Azo Compounds - chemistry
Industrial Waste - analysis
Naphthalenesulfonates - chemistry
Sonication -
Ultrasonics -

Find related publications in this database (Keywords)
ultrasound
azo compound
substrate selectivity
reaction pathway


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