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Selected Publication:

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.
Authors 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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