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Influence of enzymatic pretreatment on colour of bleached and dyed flax fibres
Darinka Fakin, Vera Golob, Karin Stana-Kleinschek, 2006, izvirni znanstveni članek

Opis: In this paper the effect of enzymatic bioscouring on the bleaching and dyeing of flax fibres was studied in comparison with conventional alkaline scouring. Enzymatic bioscouring was performed with a commercial multi-enzyme system consisting of pectinases, hemicellulases and cellulases. The enzyme and alkaline scoured flax fibres were subsequently oxidatively bleached with hydrogen peroxide and dyed with direct dye C.I. Direct Red 80 under the same conditions. The efficiency of both the scouring and bleaching processes was evaluated by weight loss and the whiteness of the bleached samples was determined according to CIE formula. The exhaustion profile of the used dye was followed on-line during the dyeing process using absorbance measurement. The colours of bleached and dyed samples were evaluated using CIELAB colour values. The residual pretreatment and dyeing baths were ecologically analysed with COD, TOC and BOD5. The obtained results indicate that enzymatic scouring provides a lower weight loss, a higher degree of whiteness, comparable dyeing properties and is more environmentally friendly.
Ključne besede: textile fibres, flax, linen fibres, enzymatic pretreatment, dyeing, bleaching
Objavljeno: 31.05.2012; Ogledov: 845; Prenosov: 11
URL Povezava na celotno besedilo

Application of cyclodextrins in textile dyeing
Bojana Vončina, 2011, samostojni znanstveni sestavek ali poglavje v monografski publikaciji

Ključne besede: textile dyeing, cyclodextrins, dyeing auxiliaries, polyfunctionalization, textile waste water
Objavljeno: 01.06.2012; Ogledov: 856; Prenosov: 48
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Different measures of sensitivity of recipe colour to random and proportional dye concentration error
Boris Sluban, Olivera Šauperl, 2005, izvirni znanstveni članek

Opis: A regularity of the predicted sensitivities to random and proportional dye concentration errors in regard to the position of target colour has been observed for the case of dyeing acrylic with basic dyes. The sensitivity of the recipe colour to random dye concentration errors is highest for light neutral target colours and is almost negligible for dark-shade recipes. Recipes for less saturated targets are slightly more sensitive than recipes for more saturated targets of equal lightness. The span of the sensitivities to weighing error of the recipes matching a given target varies with the position of the target in colour space. By contrast, the sensitivity of recipes to dye strength error is the highest at medium to low lightness for neutral and near neutral target shades. The span of sensitivities of the recipes for any such particular target is broad, with some having low sensitivity to strength errors. Recipes for the target colours at the "lighter" part of the gamut border were the least sensitive to strength errors.
Ključne besede: colour, textile dyeing, computer aided reciping, recipe's colour sensitivity
Objavljeno: 01.06.2012; Ogledov: 862; Prenosov: 18
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Removal of vat and disperse dyes from residual pad liquors
Vera Golob, Alenka Ojstršek, 2005, izvirni znanstveni članek

Opis: The efficiency of three wastewater treatment techniques, coagulation/flocculation, adsorption and ultrafiltration, has been studied for the removal of vat and disperse dyes from residual pad liquors. Three inorganic coagulants Al2(SO4)3 18H2O, FeSO4 7H2O, FeCl3 6H2O and commercial cationic flocculant, as individuals and in combination, were tested for the coagulation/flocculation methods. Granular activated carbon was used as an adsorbent in the adsorption technique. Ultrafiltration was performed using a polyethersulfone membrane with a molecular weight cut-off of 10 kDa. Dye removal was evaluated as the difference between concentrations of dyes in pad liquors before and after a particular treatment using absorbance measurements.The obtained results indicated over 90% of dye removal using appropriate coagulants and only 40% using activated carbon. The best results, dye removal over 98%, were achieved using the ultrafiltration technique.
Ključne besede: textile dyeing, disperse dyes, wastewater, decoloration, wastewater treatment, coagulation, flocculation, adsorption, ultrafiltration, vat dyes
Objavljeno: 01.06.2012; Ogledov: 1293; Prenosov: 61
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Ecological alternatives to the reduction and oxidation processes in dyeing with vat and sulphur dyes
Mojca Božič, Vanja Kokol, 2008, pregledni znanstveni članek

Opis: 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.
Ključne besede: textile dyeing, vat dyes, sulphur dyes, reduction, oxidation, catalysis, ecology, organic agents, electrochemistry, ultrasound, magnetic field, UV application, biotechnology
Objavljeno: 01.06.2012; Ogledov: 1267; Prenosov: 62
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[Beta]-cyclodextrin as a retarding reagent in polyacrylonitrile dyeing
Bojana Vončina, Vera Vivod, Darja Jaušovec, 2007, izvirni znanstveni članek

Opis: ß-Cyclodextrin was tested as a dye complexing agent - as a dye retardant in the dyeing of PAN fibres with cationic dyes. Significant improvement of colouruniformity and some improvements in colour depth were observed when PAN fibres were dyed in the presence of ß-cyclodextrin as compared to dyeing in the presence of a commercial retardant.
Ključne besede: textile dyeing, cationic dyes, cyclodextrin, polyacrylonitrile fibres, complexation
Objavljeno: 01.06.2012; Ogledov: 1005; Prenosov: 9
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Case study of the sonochemical decolouration of textile azo dye Reactive Black 5
Simona Vajnhandl, Alenka Majcen Le Marechal, 2007, izvirni znanstveni članek

Opis: 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.
Ključne besede: textile industry, wastewater treatment, textile dyeing, reactive dyes, azo dyes, decoloration, ultrasound, degradation, decoloration kinetics, oxidizing species
Objavljeno: 01.06.2012; Ogledov: 1215; Prenosov: 52
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Residual dyebath purification using a system of constructed wetland
Alenka Ojstršek, Darinka Fakin, Danijel Vrhovšek, 2007, izvirni znanstveni članek

Opis: A constructed wetland model, comprising two different substrate mixtures, was used to purify textile dyebath wastewater. Three laboratory prepared wastewaters containing three commercial dyes of different classes and chemicalconstitution (one vat and two reactive dyes), different chemicals (NaOH, NaCl) and auxiliaries (migration inhibitor, sequestering, defoaming andwetting agents) were employed. Purifying efficiency was verified by measuring pollution parameters, such as absorbance, pH, total organic carbon (TOC), chemical oxygen demand (COD) and electrical conductivity (EC). It was found that the constructed wetland model reduced dye concentration by up to 70%, lowered the TOC and COD values up to 88%, electrical conductivity up to 60% and pH from 12 to 7.6.
Ključne besede: textile dyeing, reactive dyes, vat dyes, wastewater treatment, constructed wetland model, biological treatment, purification
Objavljeno: 01.06.2012; Ogledov: 1143; Prenosov: 50
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Different measures of sensitivity of recipe colour to random and proportional dye concentration error
Boris Sluban, Olivera Šauperl, Mihaela Pozderec, 2007, izvirni znanstveni članek

Opis: The essential question of the paper "Can the predicted sensitivity to random and/or proportional dye concentration errors assist in selecting the most repeatable recipes?" was investigated using the laboratory dyeing of acrylic fabric with basic dyes. When the dye strength errors were not involved, the biggest scattering of the recipe colour in repeated dyeings was observed in the cases of light neutral target colours, where the predicted sensitivity to random concentration errors was the highest. For a few low-saturated targets, eight recipes with different predicted sensitivities to random errors were treated. In six cases out of the seven treated, those recipes less sensitive to random concentration errors generally performed better than the more sensitive ones, but the correlation was rather weak. For those cases whenthe dye strength errors were included, experiments were also carried out with several different recipes for a neutral medium-lightness target colour.
Ključne besede: colour, textile dyeing, computer aided reciping, recipe colour sensitivity
Objavljeno: 01.06.2012; Ogledov: 1050; Prenosov: 16
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