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Title:Case study of the sonochemical decolouration of textile azo dye Reactive Black 5
Authors:Vajnhandl, Simona (Author)
Majcen Le Marechal, Alenka (Author)
Files:URL http://dx.doi.org/10.1016/j.jhazmat.2006.07.005
 
Language:English
Work type:Unknown ()
Typology:1.01 - Original Scientific Article
Organization:FS - Faculty of Mechanical Engineering
Abstract:The decolouration and mineralization of reactive dye C.I. Reactive Black 5, a well-known representative of non-biodegradable azo dyes, by means of ultrasonic irradiation at 20, 279 and 817 kHz has been investigated with emphasis on the effect of various parameters on decolouration and degradation efficiency. Characterization of the used ultrasound systems was performed using calorimetric measurements and oxidative species monitoring using Fricke and iodine dosimeter. Experiments were carried out with low frequency probe type, and a high-frequency plate type transducer at 50, 100 and 150 W of acoustic power and within the 5-300 mgžL initial dye concentration range. Decolouration, as well as radical production, increased with increasing frequency, acoustic power, and irradiation time. Any increase in initial dye concentration results in decreased decolouration rates. Sonochemical decolouration was substantially depressed by the addition of 2-methyl-2-propanol as a radical scavenger, which suggests radical-induced reactions in the solution. Acute toxicity to marine bacteria Vibrio fischeri was tested before and after ultrasound irradiation. Under the conditions employed in this study, no toxic compounds were detected after 6 h of irradiation. Mineralization of the dye was followed by TOC measurements. Relatively low degradation efficiency (50% after 6 h of treatment) indicates that ultrasound is rather inefficient in overall degradation, when used alone.
Keywords:textile industry, wastewater treatment, textile dyeing, reactive dyes, azo dyes, decoloration, ultrasound, degradation, decoloration kinetics, oxidizing species
Year of publishing:2007
UDC:677.027.4:628.3:534-8
ISSN on article:0304-3894
COBISS_ID:10568214 Link is opened in a new window
NUK URN:URN:SI:UM:DK:RBMNUNSD
Views:1295
Downloads:59
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Record is a part of a journal

Title:Journal of hazardous materials
Shortened title:J. hazard. mater.
Publisher:Elsevier Scientific Publ. Co.
ISSN:0304-3894
COBISS.SI-ID:25748224 New window

Secondary language

Language:English
Keywords:tekstilna industrija, odpadne vode, barvanje tekstilij, reaktivna barvila, azo barvila, razbarvanje odpadnih vod, ultrazvok, degradacija, kinetika razbarvanja


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