Wyniki wyszukiwania - BazTech

1

Effects of a Multi Scouring Agent on the Pretreatment and Dyeing of different Cellulosic Knitted Fabrics

Khan Olin, Wasima Antara, Jahan Nusrat, Sarkar Md. Imrul, Das Shohag Chandra

Fibres & Textiles in Eastern Europe

|

2023

|

Vol. 31, no. 3

56--63

EN

The study tested the use of Viscobleach as a multi-scouring agent for pretreating cellulosic fabrics (cotton, viscose, and linen) instead of using traditional agents (caustic soda, soda ash, and hydrogen peroxide). The results showed an increase in whiteness and absorbency for viscose and linen fabrics pretreated with Viscobleach. The color strength (K/S) increased for all shades of cotton and for medium and dark shades of viscose and linen. The study also showed that the dye pick-up was higher and dye wastage lower with the Viscobleach pretreatment. The color fastness to wash and rubbing was rated 4-5 for all samples.

2

The Effect of Mineral Salt on Reactive Dye Removal from Aqueous Solutions by Ultrafiltration

Ahmed Arif Eftekhar, Majewska-Nowak Katarzyna, Grzegorzek Martyna, Szymanek Igor

Journal of Ecological Engineering

|

2022

|

Vol. 23, nr 10

239--247

EN

The effect of mineral salt on the reactive dye removal was evaluated by using flat ultrafiltration (UF) membranes made of polyethersulfone (PES) and regenerated cellulose (C). Five reactive dyes varied in molecular weight (Reactive Orange 16, Remazol Brilliant Blue R, Reactive Orange 20, Reactive Black 5, Reactive Read 120) were used in the UF experiments. The applied membranes were characterized by the cut-off value equal to 10 kDa. The ultrafiltration process was performed in a dead-end mode under the transmembrane pressure of 0.2 MPa. Dye concentration in model solutions was equal to 100 mg/dm3. Two various mineral salts (NaCl and Na2SO4) were chosen to simulate the composition of dye-house baths. The concentration of monovalent and divalent salt in model dye solutions amounted to 1–2 g/dm3. Transport and separation properties of the UF membranes towards reactive dyes and mineral salts were evaluated. It was found that the separation efficiency of all tested dyes was dependent on the mineral salt presence. The effect of mineral salt on dye retention was more pronounced for membrane made of regenerated cellulose (C) than for polyethersulfone membrane (PES). In the case of the C membrane the dye retention coefficients varied in the wide range – from 55 to 83%, whereas for PES membrane the degree of dye separation was less diverse and amounted to 81–96%. The presence of mineral salt in water and dye solutions generally worsen the membrane permeability due to osmotic pressure increase as well as enhancing adsorptive fouling of dye particles in membrane matrix.

3

Adsorption Kinetic and Isotherm Studies of Reactive Red B Textile Dye Removal Using Activated Coconut Leaf Stalk

Sudiana I. Ketut, Sastrawidana I. Dewa Ketut, Sukarta I. Nyoman

Ecological Engineering & Environmental Technology

|

2022

|

Vol. 23, iss. 5

61--71

EN

Textile wastewater has become one of the serious environmental problems due to containing a high concentration of chemicals with extreme color intensity. Reactive red RB is among the synthetic azo dyes commonly used as a textile colorant with their property are very difficult to degrade naturally. This research was focused on studying the kinetic behavior, and adsorption isotherm of reactive red RB textile dye on coconut leaf stalk activated carbon (CLSC). Coconut leaf stalk carbon was activated using sulphuric acid and sodium hydroxide. It was investigated in terms of chemical functional groups, surface morphology, carbon content, ash content, and adsorption efficiency of reactive red RB textile dye under various conditions of initial pH, incubation time, and dye concentration. The results showed the maximum adsorption efficiency of reactive red RB dye with a concentration dye of 60 mg/l onto CLSC surface activated by sulfuric acid and sodium hydroxide in an experiment carried out at pH 5 for 120 min were 88.73% and 64.27%, respectively. The adsorption isotherm of reactive red RB on the CLSC surface follows the Langmuir isotherm model, which shows that the adsorption process occurs monolayer. In contrast, the adsorption kinetics correspond to pseudo-second-order.

4

Removal of reactive dyes from aqueous solutions using ultrafiltration membranes

Ahmed Arif Eftekhar, Majewska-Nowak Katarzyna, Grzegorzek Martyna

Environment Protection Engineering

|

2021

|

Vol. 47, nr 3

109--120

EN

The removal of five reactive dyes varying in molecular weight (Reactive Orange 16, Remazol Brilliant Blue R, Reactive Orange 20, Reactive Black 5, Reactive Red 120) was evaluated by using flat ultrafiltration membranes made of polyethersulfone (PES) and regenerated cellulose (C) characterized by various cut-off values (5, 10, and 30 kDa). The ultrafiltration process was performed in a dead-end mode under the transmembrane pressure range of 0.05–0.2 MPa. Dye concentration in model solutions was equal to 100 mg/dm3. The separation efficiency of all tested dyes was strongly dependent on the membrane type and the membrane cut-off, as well as on the applied pressure. Unexpectedly, the molecular weight of the tested reactive dyes had a minor impact on the dye removal effectiveness. The ultrafiltration membranes made of polyethersulfone and regenerated cellulose can be used in reactive dye removal on the condition that the membrane cut-off is not higher than 10 kDa. The PES and C membranes enable the separation of reactive dyes by 80–97%, and 45–89%, respectively.

5

The Removal of Reactive Red 141 From Wastewater: A Study of Dye Adsorption Capability of Water-Stable Electrospun Polyvinyl Alcohol Nanofibers

Akduman Çigdem, Morsümbül Seniha, Akçakoca Kumbasar Emriye Perrin

Autex Research Journal

|

2021

|

Vol. 21, no. 1

20--31

EN

The dye production and its use in textile and related industries resulted in discharge of dye to wastewater. Adsorption for color removal is known as equilibrium separation process, and the resultant decolorization is influenced by physicochemical factors such as adsorbent surface area. The nanofiber membranes prepared by the electrospinning method have controllable nanofiber diameter and pore size distribution (PSD) with a high surface area to volume or mass ratio. In this study, polyvinyl alcohol (PVA) nanofibrous membranes were prepared by the electrospinning method at different collection times such as 3, 5 and 10 h and heat fixated at 130, 150 and 170°C for 10 min, and then, the adsorption capability of PVA nanofiber membranes for Reactive Red 141 from aqueous solution was investigated. In order to make PVA nanofibers stable to water, the nanofibrous membranes were chemically cross-linked by a polycarboxylic acid (1,2,3,4 butanetetracarboxylic acid (BTCA)). PVA nanofibrous membranes were characterized by scanning electron microscopy, thermogravimetric analysis, swelling tests and pore size analysis. The results indicated that BTCA crosslinking improved the thermal and water stability of the nanofibrous structure but has no significant effect on the pore sizes of the membranes. Adsorption of Reactive Red 141 was studied by the batch technique, and it was observed that PVA nanofibers removed approximately >80% of the dye.

6

Removal of reactive dye from aqueous solutions using banana peel and sugarcane bagasse as biosorbents

Ahmed Arif Eftekhar, Majewska-Nowak Katarzyna

Environment Protection Engineering

|

2020

|

Vol. 46, nr 3

121--135

EN

The adsorption of Eurozol Navy Blue (ENB) reactive dye was examined using banana peel and sugarcane bagasse powders. Several parameters such as pH, contact time, agitation speed, temperature, initial dye concentration, and adsorbent dosage were considered and their impact on dye adsorption efficiency was evaluated. The removal percentages of ENB dye due to adsorption on banana peel and sugarcane bagasse were 72% and 70%, respectively. Simultaneous dosing of both biosorbents resulted in 68% dye removal. The Langmuir isotherm model was found to fit the adsorption of ENB dye on banana peel and sugarcane bagasse powders. The corresponding maximum adsorption capacities were equal to 24.09, 32.46, and 27.54 mg/g for banana peel powder, sugarcane bagasse powder, and the mixture of adsorbents, respectively.

7

Adsorption of reactive dyes and their mixtures on activated carbon. Kinetics, equilibrium and thermodynamic evaluation

Kouhail Meriem, Elahmadi Zakia, Benayada Abbes, Dewil Raf

Environment Protection Engineering

|

2020

|

Vol. 46, nr 2

5--24

EN

The adsorption of three reactive dyes (Reactive Bezactiv Yellow (RBY), Reactive Bezactiv Blue (RBB) and Reactive Bezactiv (RBR)) on a commercially available activated carbon (CAC) has been evaluated. It was shown that CAC is capable to effectively remove these dyes from a solution. The adsorption increased with higher contact time, adsorbent dose, and initial dye concentration. The data indicated that the adsorption kinetics of dyes on CAC followed a pseudo-second order model. The adsorption isotherms followed the Langmuir isotherm model. Evaluation of thermodynamic parameters revealed that the adsorption process is endothermic for all dyes and spontaneous in a single system and became spontaneous in mixture systems at high temperature, expect RBY and RBB in the ternary mixture. Adsorption was higher for RBY, followed by RBB, and was lowest for RBR. The total adsorption efficiency was confirmed by chemical oxygen demand (COD) measurements.

8

Removal of acid, direct and reactive dyes on thepolyacrylic anion exchanger

Polska-Adach Ewelina, Wawrzkiewicz Monika, Hubicki Zbigniew

Physicochemical Problems of Mineral Processing

|

2019

|

Vol. 55, iss. 6

1496--1508

EN

In the present studythe polyacrylic anion exchanger Amberlite IRA 478 (IRA 478) was used forremoval of textile dyes such as C.I. Acid Red 18 (AR18), C.I. Reactive Blue 21 (RB21) and C.I. Direct Yellow 142 (DY142) from aqueous solutions. Sorption of the above-mentioned dyes was carried out by the static and dynamic methods. The obtained results were analyzed by determining the adsorption isothermparameters using the Langmuir and Freundlichmodels. Kinetic parameters of dyessorption were calculated from the pseudo-first order, pseudo-second order and intraparticle diffusion models. The monolayer sorption capacities of IRA 478 determined from the Langmuir isotherm were found to be 1098.5 mg/g for AR18 (R2=0.994), 46.8 mg/g for DY142 (R2=0.820) and 23.5 mg/g for RB21 (R2=0.987).Kinetic studies revealed that effectiveness of AR18, DY142 and RB21 uptakeincreases with increasing phase contact time and initial dyesconcentration.The kinetics of the dyessorption process on the anion exchanger is best described by the pseudo-second order model (PSO) due to the high values of the determination coefficients R2 (linearity condition of the plot t/qt vs.t). The rate constantsof the pseudo-second order kinetics k2are reduced from 0.1001 to 0.0008 g/mg·min for AR18, from 0.0147 to 0.0112 g/mg·min for DY142 and 0.0489 to 0.0072 g/mg·min for RB21 with an increase of initial concentration of dyes.The presence of salts and surfactants had an impact on the retention of direct and reactive dyes.

9

One-Bath One-Step Dyeing of a Polyester/ Cotton Blend using the Pad-Dry-Fixation Process

Elsherbiny A. S., Kaukab M.

Fibres & Textiles in Eastern Europe

|

2016

|

Vol. 24, no. 2 (116)

113--119

EN

The aim of this research work was to evaluate the one bath dyeing of polyester/cotton blend and to compare the results with those of two bath dyeing. Polyester/cotton (50:50) blend fabrics were studied using dichlorotriazine based reactive dye and compatible disperse dye. The one bath one step method was used to shorten the dyeing process, increase yield and reduce the utility and chemical cost. Trichloroacetic acid (TCAA) was used to provide an acidic and basic medium with a change in temperature. A TCAA/sodium carbonate buffer was also used to obtain the best colour yield. In two bath dyeing disperse dye was fixed on polyester fibre in an acidic medium, whereas reactive dye was fixed on cellulosic fibre in an alkaline medium. In the final stage, the dyed fabric was evaluated by testing the light, washing and rubbing fastness and colour yield strength properties of the dye. The results clearly show that polyester/cotton fabric presents good fastness and colour strength values when the one bath one step dyeing method is used.

PL

Celem badania było opracowanie barwienia jednostopniowego w jednej kąpieli materiałów z mieszanek poliestrów i bawełny, oraz porównanie wyników z wynikami z procesu barwienia w dwóch kąpielach. Badano materiały z mieszanki 50:50 poliester/bawełna. Stosowano barwniki reaktywne oparte na dichlorotriazine i odpowiednie barwniki dyspersyjne. Metoda barwienia jednostopniowego w jednej kąpieli była używana dla skrócenia procesu barwienia, wzrostu wybarwialności i zmniejszenia kosztów. Kwas trójchlorooctowy (TCAA) stosowano dla uzyskania kwaśnego i zasadowego medium zmieniającego swoją kwasowość ze zmianą temperatury. Bufor TCAA/węglan sodu był również stosowany dla uzyskania najlepszego wybarwienia. W barwieniu dwu-kąpielowym barwnik dyspersyjny był utrwalany na włóknach poliestrowych w kwaśnym medium podczas gdy reaktywny barwnik był utrwalany na włóknach celulozowych w medium alkalicznym. W końcowym stadium barwiony materiał był poddany badaniom na odporność na światło, pranie i tarcie. Badano również wybarwienie. Wyniki jasno wskazują, że materiały poliestrowo-bawełniane mają dobrą odporność oraz jakość koloru przy barwieniu metodą jednostopniową w jednej kąpieli.

10

Enzymatic Polishing and Reactive Dyeing of Cotton Fabric in One Bath

Wang P., Hong Y., Ding Y., Cui L., Yuan J., Wang Q., Fan X.

Fibres & Textiles in Eastern Europe

|

2015

|

Vol. 23, no. 1 (109)

109--113

EN

Cellulase has the ability to remove fuzz-fibres from cellulosic textiles, which endows fabric with a glabrous appearance and soft handle. In this paper, the combined uses of bio-polishing and reactive dyeing in one bath were carried out, aiming at shortening the treatment time and reducing the overall consumption of water and energy as well. The properties of cotton fabrics before and after the combined treatments were investigated, including the colour strength, colour fastnesses and tearing strength. The results indicated that the colour fixing agent of soda had noticeable inhibiting effects on cellulase activity. Meanwhile reactive dyes might react with cellulase proteins under alkaline conditions, resulting in decelerating influences on the dye-fibre covalent reactions. The acceptable one-bath process consisted of bio-polishing and dyeing of cotton in neutral solution, followed by dye fixation under alkaline conditions. Compared to polishing and dyeing in two baths, the one-bath method endowed fabric with a bit lower colour strength.

PL

Celulaza ma zdolność do usuwania włosków zmechacenia z tekstyliów celulozowych, co pozwala na osiągnięcie gładkiej powierzchni o delikatnym chwycie. W pracy badano sumaryczny efekt biopolerowania i reaktywnego barwienia przeprowadzanych w jednej kąpieli. Metoda ta ma na celu skrócenie czasu obróbki i zredukowanie ogólnego zapotrzebowania na wodę i energię. Badano właściwości tkanin bawełnianych przed i po obróbce. Między innymi badano nasycenie kolorem, trwałość koloru i wytrzymałość na rozrywanie. Wyniki wskazują, że soda jako środek utrwalający kolor ma zauważalny wpływ na hamowanie działania celulazy. Porównując metodę równoczesnego polerowania i barwienia z metodą, gdzie obydwie obróbki stosowane są indywidualnie stwierdzono, że w metodzie równoczesnej obróbki uzyskuje się nieco niższe nasycenie koloru.

11

Adsorption Kinetics of Reactive Dyes on Ash from Town Heating Plant

Djordjevic D., Stojiljkovic D., Smelcerovic M.

Archives of Environmental Protection

|

2014

|

Vol. 40, no. 3

123--135

EN

In order to investigate the mechanism of adsorption of reactive dyes from the textile industry on ash from heating plant produced by brown coal combustion, some characteristic sorption constants are determined using Langergren adsorption equations for pseudo-ﬁrst and pseudo-second order. Combined kinetic models of pseudo-ﬁrst order and pseudo-second order can provide a simple but satisfactory explanation of the adsorption process for a reactive dye. According to the characteristic diagrams and results of adsorption kinetic parameters of reactive dyes on ashes, for the applied amounts of the adsorbents and different initial dye concentrations, it can be concluded that the rate of sorption is fully functionally described by second order adsorption model. According to the results, the rate constant of pseudo-second order decreases with increasing initial dye concentration and increases with increasing amount of adsorbent – ash.

12

Thermodynamics of reactive dye adsorption from aqueous solution on the ashes from city heating station

Djordjevic D., Stojkovic D., Djordjevic N., Smelcerovic M.

Ecological Chemistry and Engineering. S

|

2011

|

Vol. 18, nr 4

527-536

EN

This paper describes the adsorption thermodynamics of textile reactive dyes from aqueous solution on the waste ashes formed by burning brown coal at a city heating station. The values of thermodynamic parameters are the actual indicators for practical application in the adsorption process. Based on characteristic diagrams the thermodynamic parameters, enthalpy and entropy of adsorption are determined, and based on those data the Gibbs's free energy changes were determined. In all cases, there is a negative sign of the thermodynamic parameters. Entropy change (–2 to –3 J/K×mol) increases with increasing initial concentration of the adsorbate and decreases with increasing amount of adsorbent, suggesting a decrease in disordered system at the interface of solid - solution during the adsorption of dye on the ashes. Free energy (–1.7 to 5 kJ/mol) decreases with the concentration of adsorbate discontinuously but continuously with increasing temperature, which is associated with spontaneous nature of the process. Small negative values of enthalpy change (–2 to –6 kJ/mol), point to the physical nature and the energy stability of the reactive dyes adsorption by ashes.

PL

W pracy opisano termodynamikę adsorpcji reaktywnych barwników tkanin z roztworu wodnego na popiołach powstających jako odpad w wyniku spalania węgla brunatnego w miejskich ciepłowniach. Wartości parametrów termodynamicznych są właściwymi wskaźnikami służącymi praktycznemu opisowi procesu adsorpcji. Na podstawie odpowiednich diagramów zostały określone następujące parametry termodynamiczne: entalpia i entropia adsorpcji, a na podstawie tych danych określono zmiany energii Gibbsa. We wszystkich przypadkach wartości parametrów termodynamicznych były ujemne. Różnica entropii (–2 do –3 J/Kźmol) rośnie wraz ze wzrostem początkowego stężenia adsorbatu i zmniejsza się wraz ze zwiększającą się ilością adsorbentu, co sugeruje zmniejszenie nieuporządkowania układu na granicy fazy stałej i roztworu w trakcie adsorpcji barwnika na popiołach. Energia swobodna (–1,7 do 5 kJ/mol) zmniejsza się w sposób nieciągły wraz ze stężeniem adsorbatu, ale w sposób ciągły wraz ze wzrostem temperatury, co jest związane ze spontanicznym charakterem procesu. Małe, ujemne wartości zmiany entalpii (–2 do –6 kJ /mol) wskazują na fizyczny charakter i stabilność energii adsorpcji barwników reaktywnych na popiołach.

13

Adsorption Behavior of Reactive Dye from Aqueous Phase on Activated Carbon

Khan M. R., Rahman M. M., Mozumder M. S. I., Uddin M. J., Islam M. A.

Polish Journal of Chemistry

|

2009

|

Vol. 83, nr 7

1365-1378

EN

The adsorption of a reactive dye (Procion Red) from aqueous solution onto activated carbon was investigated. The effect of contact time, pH, adsorbent dosage and temperature were studied. The equilibrium data were described well by both Langmuir and Freundlich isotherm model. The adsorption kinetics was tested for pseudo-first-order, pseudo-sec - ond order, intraparticle diffusion and unified approach kinetic models. The unified approach model de scribed the kinetic data in accor dance with the experimental data and the forward and backward rate constants were evaluated from the model fittings. The adsorption is highly pH dependent and adsorption efficiency in creases with the decrease in pH. Thermodynamic parameters of the adsorption process suggested that the process was endothermic. The adsorption capacity of regenerated activated carbon showed more than 70 percent recovery of the adsorption efficiency of the initial virgin adsorbent.

14

Evaluating the toxicity of reactive dyes and dyed fabrics with the Hepa-1 cytotoxicity test

Klemola K., Pearson J., Von Wright A., Liesivuori J., Lindström-Seppä P.

Autex Research Journal

|

2007

|

Vol. 7, no. 3

224--230

EN

We investigated the cytotoxicity of reactive dyes and dyed fabrics using an in vitro hepa-1 cytotoxicity test. Hepa-1-mouse cells were exposed to three monochlortriazinyl dyes: yellow, red and blue with different concentrations. The hepa-1-mouse cells were also exposed to water extracts of dyed fabrics. After 72 hours exposure, the viability of the cells was detected by measuring the protein content of the cells. The mean inhibitory concentration IC50, which shows the sample concentration when the protein content is 50%, was compared to the total protein content of the non-exposed cells. The inhibitory concentration IC20 value, which shows the sample concentration when the protein content is 80%, was also measured. The IC20 value shows the limiting value of low toxicity. The values measured showed high toxic effects of the dyes. The blue dye was shown to be the most toxic, although the red dye showed toxicity at the lowest concentrations. Wheras the pure dyes showed toxicity under low concentrations, the dyed fabrics showed no toxicity. The hepa-1 cytotoxicity test and the spermatozoa motility inhibition test supported each other, giving similar results. Both tests can be used when studying the toxicity of textile substances.

15

Evaluating the toxicity of reactive dyes and dyed fabrics with the HaCaT cytotoxicity test

Klemola K., Pearson J., Lindström-Seppä P.

Autex Research Journal

|

2007

|

Vol. 7, no. 3

217--223

EN

We investigated the cytotoxicity of reactive dyes and dyed fabrics using human keratinocyte HaCaT cells in vitro. The HaCaT cells were exposed to three monochlortriazinyl dyes: yellow, red and blue with different concentrations. The HaCaT cells were also exposed to water extracts of dyed fabrics. After 72 hours exposure, the protein contents of the samples compared to the protein contents of non-exposed cells were measured. The level of protein content indicates the viability of the cells. The mean inhibitory concentration values (IC50) showed the dye concentration when the protein content of the sample was 50% of the protein content of the non-exposed cells. The mean inhibitory concentration values (IC20) when the protein content of the samples was 80% were also measured. The IC20 values show the limiting value of toxicity. The IC50 values show whether samples are clearly toxic. The IC50 value for the yellow dye was 237µg/ml and the IC20 value was 78µg/ml. The IC50 for the red dye was 155µg/ml: the red dye caused adverse effects under the lowest dye concentration (28µg/ml). The IC50 value for the blue dye was 278µg/ml and the IC20 value was 112µg/ml. Cotton fabrics dyed using these same three reactive dyes were extracted with water and the extracts were analysed using the HaCaT cell line. The viability of the cells was good, the protein content of the samples being over 80% compared to the non-exposed cells. The HaCaT cell test indicated the toxicity of pure dyes; the dyed fabrics had no adverse effect. The human keratinocyte HaCaT cells seem to be a useful tool for the study of the purity/toxicity of dyes and other substances applied to textiles.

16

Evaluating the toxicity of reactive dyes and fabrics with the spermatozoa motility inhibition test

Klemola K., Honkalampi-Hämäläinen U., Liesivuori J., Pearson J., Lindström-Seppä P.

Autex Research Journal

|

2006

|

Vol. 6, no. 3

182--190

EN

In this study, the toxicity of reactive dyes and dyed fabrics was investigated using spermatozoa cells in vitro. Boar semen was exposed to different concentrations of monochlorotriazinyl dyes: yellow, red and blue. The spermatozoa cells were also exposed to extracts of dyed fabrics. After 24 and 72 hours respectively, the viability of the cells was evaluated by microscopy. The mean inhibitor concentrations IC50, showing the concentration of the dye when half of the cells are dead compared to the control sample, were calculated from the viability values. After 24 hours' exposure, the IC50 value calculated for the yellow dye was 135µg/ml, and after 72 hours 60µg/ml. The IC50 value for the red dye was 124µg/ml after 24 hours, and 46µg/ml after 72 hours. The IC50 value for the blue dye after 24 hours was 127µg/ml. After 72 hours, the blue dye caused high toxicity: more than half the cells were dead. Cotton fabrics dyed using these three reactive dyestuffs were extracted by water and analysed by the spermatozoa motility inhibition test. The viability of the cells when exposed to fabric extracts was good. However, after 72 hours' exposure, the standard deviation and coefficient of variation values for cell viability of fabric extracts were large. The spermatozoa inhibition test indicated the toxicity of pure dyes, the dyed fabrics having no adverse effects. The spermatozoa test seems to be useful when screening different substances and when used in addition to other tests. The spermatozoa motility inhibition test can be used for textile material studies.