textile industries use different chemicals in indigo dyeing processes. interest in eco-friendlyprocessing in the textile industry has recently increased because of a larger awareness of environmental issues. for the case of indigo dyeing process, the reducing agent conventionally used is the - environmentally unfavourable – sodium dithionite, which will be replaced in this study with an ecologi...

textile industries use different chemicals in indigo dyeing processes. interest in eco-friendlyprocessing in the textile industry has recently increased because of a larger awareness of environmental issues. for the case of indigo dyeing process, the reducing agent conventionally used is the - environmentally unfavourable – sodium dithionite, which will be replaced in this study with an ecologi...

Indigo is one of the most consumed dyes in the textile sector, as it is widely used for the dyeing of denim clothes. About 15% of indigo used in the dyeing process is discharged to the wastewater treatment plants or sometimes into rivers, in countries where regulations are not strictly applied. In this work, real effluents that contained indigo dye were treated by means of 4 different ultrafilt...

Indigo is the world's most produced synthetic dye because of its use in the denim industry. The wastewaters from the dyeing industry are loaded with pollutant which is the reason there has been an interest in the revival of the indigenous system of dyeing through plant derived indigo. India was the major producer of Indigo in the middle ages with producing 80% of the world's indigo. It is cruci...

Denim jeans, dyed with natural or synthetic indigo, are the most popular garments worn by individuals of all ages and approximately one billion pairs of jeans are produced per annum. Traditionally, denim has been woven with cotton in a warp face twill weave, in which the warp is blue whereas the weft is white. Dyeing is usually performed with pure indigo, or indigo combined with a sulfur dye to...

Indigo carmine is a typical recalcitrant dye which is widely used in textile dyeing processes. Laccases are versatile oxidases showing strong ability to eliminate hazardous dyes from wastewater. However, most laccases require the participation of mediators for efficient decolorization of indigo carmine. Here we describe the improvement of the decolorization ability of a bacterial laccase throug...

It is widely accepted that indigo dyes derived from Murex trunculus were used to produce the biblical dyes tekhelet and argaman. We describe a method of following the debromination of natural leucoindigos and their binding to wool using NMR spectroscopy. Debromination is observed prior to reaction with the wool and prior to oxidation. Binding to the wool is shown to occur prior to oxidation. NM...

Assembled structures of dyes have great influence on their coloring function. For example, metal ions added in the dyeing process are known to prevent fading of color. Thus, we have investigated the influence of an addition of copper(II) ion on the surface structure of alkyl-derivatized indigo. Scanning tunneling microscope (STM) analysis revealed that the copper(II) complexes of indigo formed ...

Work summarized in this final report covering three years of research includes: 1) A method for real-time monitoring of disperse dye exhaustion on polyester and acetate; 2) A method for realtime monitoring of both reactive dye exhaustion and hydrolysis; 3) A comparison of a newly developed method for real-time monitoring of indigo with the conventional titrametric method; 4) Models of direct dy...