Gewählte Publikation:

Rehorek, A; Tauber, M; Gübitz, G.
(2004): Application of power ultrasound for azo dye degradation.
Ultrason Sonochem. 2004; 11(3-4):177-182 FullText FullText_BOKU

Abstract:

Power ultrasound of 850 kHz at 60, 90 and 120 W was used for the degradation of industrial azo dyes Acid Orange 5 and 52, Direct Blue 71, Reactive Black 5 and Reactive Orange 16 and 107. The results show that power ultrasound is able to mineralize azo dyes to non-toxic end products, which was confirmed by respiratory inhibition test of Pseudomonas putida. All investigated dyes have been decolorized and degraded within 3-15 h at 90 W and within 1-4 h at 120 W, respectively. Mass spectrometric investigations show, that hydroxyl radicals attack azo dyes by simultaneous azo bond scission, oxidation of nitrogen atoms and hydroxylation of aromatic ring structures. A volumetric scale-up showed a correlation between the energy input and the absolute amount of degraded dye. Up to an energy input of about 90 W no enzymatic deactivation of laccase was observed which might be helpful for a simultaneous action of sonochemical and enzymatic treatments. (C) 2004 Elsevier B.V. All rights reserved.

Autor*innen der BOKU Wien:

Gübitz Georg

Find related publications in this database (using NML MeSH Indexing)

Azo Compounds - chemistry

Biodegradation, Environmental -

Coloring Agents - chemistry

Ions - chemistry

Kinetics -

Laccase - metabolism

Luminescent Measurements -

Molecular Structure -

Pseudomonas putida - drug effects

Ultrasonics -

Vibrio - drug effects

Waste Disposal, Fluid - methods

Find related publications in this database (Keywords)

ultrasound

azo dyes

mineralization

toxicity

degradation mechanisms

enzymatic deactivation

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