Reuse of spent dyebath following decolorisation with ozone

Hassan, Mohammad Mahbubul; Hawkyard, Christopher J.

doi:10.1111/j.1478-4408.2002.tb00365.x

Cited by 15 publications

(11 citation statements)

References 6 publications

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“…Colour in the effluent is a pressing problem and needs to be addressed in a variety of ways; possible solutions to the problem include the development of new reactive dyes, with fixation efficiencies >95% at 6% depth, or the chemical modification of the substrate. A significant number of publications dealing with methods to clean up reactive dyes from effluent have appeared in the period pertinent to this review . Colour uniformity of reactive dyeings on Tencel was studied by Syed and Wardman using physical measurement from microscope analysis of fibre cross‐sections.…”

Section: The Application Of Reactive Dyes To Cellulosic Fibresmentioning

confidence: 99%

Developments in the chemistry of reactive dyes and their application processes

Lewis

2014

Coloration Technology

111

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This review describes the immense impact of reactive dyes on the textile industry. Their use on cellulosic fibres is especially important, but their growing popularity on polyamide substrates is notable. Detailed information is given about developments both in the chemistry of reactive systems and in the chemical technology involved in their application to a variety of fibre types. It is also pointed out that further research is necessary to improve dye–fibre fixation efficiency, especially when dyeing full shades on cellulosic fibres. This work is necessary to address the current environmental problem of colour in dyehouse effluent. The potential solutions reviewed include multifunctional reactive dyes, cationic reactive dyes, and cellulose fibre modification.

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Section: The Application Of Reactive Dyes To Cellulosic Fibresmentioning

confidence: 99%

Developments in the chemistry of reactive dyes and their application processes

Lewis

2014

Coloration Technology

111

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“…However, in this work, we investigated a simple optical microscopic method to evaluate dye agglomeration. 23 ■ EXPERIMENTAL SECTION Materials. The substrate used was a 210 g/m 2 2/2 twill woven fabric having 34 ends/cm and 24 picks/cm.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Several methods including electrochemical, calorimetric, polarographic, light scattering, 19F-NMR, and UV–vis techniques have been investigated to evaluate the degree of agglomeration. However, in this work, we investigated a simple optical microscopic method to evaluate dye agglomeration …”

Section: Introductionmentioning

confidence: 99%

Sustainable Ultrasound-Assisted Ultralow Liquor Ratio Dyeing of Wool Textiles with an Acid Dye

Hassan

Bhagvandas

2016

ACS Sustainable Chem. Eng.

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Conventional wool dyeing is an energy-hungry process as the dyeing is carried out at boil using a high liquor ratio. It can be energy efficient if dyeing can be carried out at low temperatures or if the liquor ratio can be reduced. Ultralow liquor ratio dyeing (materials to liquor ratio of 1:5) is advantageous as it considerably reduces consumption of auxiliary chemicals and energy in dyeing. However, at that low liquor ratio dye molecules form agglomerates causing low dye-uptake and uneven dying. In this work, the feasibility of using ultrasound in conjunction with a range of textile auxiliaries for the prevention from dye agglomeration has been investigated for the dyeing of wool with an acid dye. Three ultrasonic baths with different ultrasonic power were used to investigate the effect of ultrasonic power on dyeing performance. It was found that citric acid in conjunction with ultrasound prevented the formation of dye agglomeration in a dyebath and also produced deeper shades and uniform dyeings compared to the dyeing without ultrasound. The depth of shade increased with an increase in ultrasound power. The application of ultrasound did not cause any loss in tensile strength of the fabric, suggesting there was no fiber damage. The developed technique could be used in the textile industry to make wool dyeing even more sustainable than it is at present.

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“…Reactive dyes are the most used in dyeing activities , mainly owing to their capacity to bind on textile fibres by covalent bonds , which is the reason for their good light and washing fastness. Problems caused by colour in textile effluent increased when reactive dyes began to be used because these have a relatively low fixation level in the fibres . Moreover, they present low removal in conventional wastewater treatment plants, both in primary treatment when inorganic coagulants are used (e.g.…”

Section: Introductionmentioning

confidence: 99%

Adsorption equilibrium studies of a simulated textile effluent containing a wool reactive dye on gallinaceous feathers

Freitas

Moura

Figueiredo

et al. 2016

Coloration Technology

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Gallinaceous feathers (from Gallus gallus domesticus, strains Cobb 500 and Label) were used as adsorbent for colour removal from a simulated textile effluent containing a wool reactive dye, the Yellow Lanasol 4G (CI Reactive Yellow 39). A brief chemical and physical characterisation of feathers was performed. Equilibrium studies at different selected temperatures, in the range 10–60 °C, were carried out. The equilibrium data were analysed using the Freundlich and Langmuir isotherm models. Adsorption capacity strongly increases with temperature. A maximum adsorption capacity of around 300 mg g−1 was obtained for Gallus gallus feathers, strain Cobb 500, at 60 °C, while for strain Label, 200 mg g−1 was obtained at 50 °C. For each type of feather a generalised model, valid for a given temperature range, was obtained. The isosteric heat of adsorption calculated was positive, so the mechanism involved in the adsorption process should correspond to endothermic chemisorption. This study provides important information concerning the use of gallinaceous feathers without any chemical treatment for colour removal from real textile wastewaters. The results in this study indicated that gallinaceous feathers, when compared with activated carbon, open promising perspectives concerning their utilisation for colour removal from textile effluent discharged at high temperatures; moreover, it would be an alternative for the valorisation of this waste.

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Reuse of spent dyebath following decolorisation with ozone

Cited by 15 publications

References 6 publications

Developments in the chemistry of reactive dyes and their application processes

Developments in the chemistry of reactive dyes and their application processes

Sustainable Ultrasound-Assisted Ultralow Liquor Ratio Dyeing of Wool Textiles with an Acid Dye

Adsorption equilibrium studies of a simulated textile effluent containing a wool reactive dye on gallinaceous feathers

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