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Title:Ecological alternatives to the reduction and oxidation processes in dyeing with vat and sulphur dyes
Authors:ID Božič, Mojca (Author)
ID Kokol, Vanja (Author)
Files:URL http://dx.doi.org/10.1016/j.dyepig.2006.05.041
 
Language:English
Work type:Unknown
Typology:1.02 - Review Article
Organization:FS - Faculty of Mechanical Engineering
Abstract:This article gives a summary of the most commonly used ecologically unfriendly processes for the reduction and oxidation of vat and sulphur dyes. It also describes the new alternatives that are in the development stage and could be important in the near future. Sodium dithionite as the dominant reducing agent produces large amounts of sodium sulphate, and also toxic sulphite and thiosulphate as by-products. Consequently, high amounts of hydrogen peroxide and alkali are required for the treatment of effluents, which add to the cost of the process. Attempts have been made to use organic biodegradable reducing agents, enzymes, catalytic hydrogenation, and also indirect or direct, electrochemical reductive methods that employ a redox mediator (electron-carrier). The reduction has also been carried out via the dye radical molecule or, in the case of indigo, by direct electrochemical reduction using graphite as the electrode material. Physical techniques, for example using ultrasound, magnetic fields or UV have been shown to be effective only when used to accelerate methods using classical reduction and oxidation processes. However, although these methods offer some environmental benefits, there is still no satisfactory alternative reducing and/or oxidising agent available today.
Keywords:textile dyeing, vat dyes, sulphur dyes, reduction, oxidation, catalysis, ecology, organic agents, electrochemistry, ultrasound, magnetic field, UV application, biotechnology
Year of publishing:2008
PID:20.500.12556/DKUM-27379 New window
UDC:677.027.4:628.3
ISSN on article:0143-7208
COBISS.SI-ID:11060246 New window
NUK URN:URN:SI:UM:DK:8MA4BYRJ
Publication date in DKUM:01.06.2012
Views:3143
Downloads:122
Metadata:XML DC-XML DC-RDF
Categories:Misc.
:
BOŽIČ, Mojca and KOKOL, Vanja, 2008, Ecological alternatives to the reduction and oxidation processes in dyeing with vat and sulphur dyes. Dyes and pigments [online]. 2008. [Accessed 25 April 2025]. Retrieved from: http://dx.doi.org/10.1016/j.dyepig.2006.05.041
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Record is a part of a journal

Title:Dyes and pigments
Shortened title:Dyes pigm.
Publisher:Elsevier
ISSN:0143-7208
COBISS.SI-ID:25357056 New window

Secondary language

Language:English
Keywords:barvanje tekstilij, redukcijska barvila, žveplova barvila, redukcija, oksidacija, kataliza, ekologija, organski dodatki, elektrokemija, ultrazvok, magnetno polje, uporaba UV, biotehnologija


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