Greater importance should be attributed to finding environmentally friendly processes that are particularly suitable for the textile industry. In this work, we exploit the plant (
Reseda luteola
L.) ...for the extract of a natural yellow dye, using the tannic bark of
Acacia mearnsii
as a bio-mordant to ensure sustainable dyeing of wool fabrics. Four important extract parameters were optimized: hydroethanolic extract, pH = 7, 80 °C temperature, and a short duration of nearly 30 min as time of extraction. The pigment’s chromatographic profile shows that
7-O-glucoside luteolin
is the most dominant flavonoid in the extract. The extract shows good thermal stability up to 90 °C and pH stability under acid and neutral conditions. Then, the dyeing conditions were optimized in terms of color strength (
K/S
) values to produce textile shades with acceptable colorimetric characteristics of (
K/S
= 23.2). Pre-mordanting with alternative bio-mordant (alum stone and
Acacia mearnsii
tannin) improved the overall absorption of dyes into the fabric, producing a range of colors from pale yellow to dark brown, and showing strong resistance to washing and wet and dry rubbing. In addition to its good dyeing property, the fiber dyed with 100% of the extract shows antibacterial effect against Gram-positive
Staphylococcus aureus
bacteria, so it can be used in future applications to produce antimicrobial textiles.
The pomegranate-peel dye was extracted by boiling in this paper. Through orthogonal experiments, using dye fixation rate as an indicator, it has studied the best dyeing process of pomegranate-peel ...dye for dyeing bamboo pulp fibers with direct dyeing and same-bath mordant dyeing methods. The dyeing process parameter are optimized through orthogonal experiments as follows: (1)with direct dyeing method, when dyeing 30minutes or 50minutes, the optimal process parameters are dyeing concentration X, dyeing temperature 80°C, and dyeing PH value 8; when dyeing 70minutes, the optimal process parameters are dyeing concentration 2/3X, dyeing temperature 80°C, and dyeing PH value 9.(2) with same-bath mordant dyeing method, when dyeing 30minutes, the optimal process parameters are dyeing concentration X, dyeing temperature 80°C, and dyeing PH value8; when dyeing 50minutes, the optimal process parameters are dyeing concentration 2/3X, dyeing temperature 60°C, and dyeing PH value7; when dyeing 70minutes, the optimal process parameters are dyeing concentration X, dyeing temperature 60°C, and dyeing PH value9. It is concluded that the bamboo pulp fiber dyed with pomegranate-peel dye has good dyeing performance, which meets the color fastness requirements of fabrics.
The study explores the application of tea leaf-extracted tannin as a bio-mordant and thyme extract as a natural dye on cationized silk-cotton blend fabric to enhance colour fastness and absorption. ...The colour strength and depth (shown as DL, Da, and Db values) on silk-cotton blend fabric were investigated in the CIE lab test. The results showed that temperature, shade percentage, and mordanting had a substantial impact on the dyeing process efficacy at DL = 30.61, Da = 11.49 and Db = 12.77. When the temperature was raised to 90 °C and the dye content was increased to 120%, the dyed sample's colour fastness (as measured by wash, rubbing, and perspiration) significantly improved, acquiring a grade of 4 to 5, which indicates good to excellent. There was a slight change in wet rubbing fastness from grade 3 to grade 4, indicating good to fair. The K/S values of the silk and cotton fibres, which ranged from 8.89 to 7.94 on average, respectively, demonstrated that the processes of bio-mordanting and cationization enhanced the absorption of dye. Tensile strength and extension increased in the weft direction to 22.19 N force and 5.21% extension at break, while the warp direction showed a fall to 6.63 N force and a rise in extension of 0.72%. FTIR spectroscopy confirmed the presence of Amino (N-H) bonds, Carbohydrate bonds (CH), Tannins, and Terpenoid phytochemicals of thyme in the dyed sample. The study highlights the potential of thyme extract as a natural dye and its benefits in improving the dyeing properties of silk-cotton blend fabric.
Nanocomposite Ag
0
(NPs)/TiO
2
is synthesised in a facile template method enabling nanoparticles of reduced Ag evenly distributed within the titania network. The morphological studies of ...nanocomposites were extensively performed employing SEM/EDX (scanning electron microscopy/energy dispersive X-ray), TEM (transmission electron microscopy) and AFM (atomic force microscopy). Moreover, the bandgap energies of materials were obtained using the diffuse reflectance spectrometer (DRS). The newer insights in the photocatalytic elimination of Mordant Orange-1 (MO1) was obtained using the nanocomposite thin film for various parametric studies utilising the UV-A and LED illuminations. The kinetics of degradation of MO1 was performed, and the rate constant was favoured at lower concentrations of MO1. Moreover, the elimination efficiency of MO1 was favoured with a decrease in solution pH. The NPOC results inferred that a fairly good extent of MO1 was mineralised using a thin-film catalyst for both the UV-A and LED illuminations. The minimal effect of several co-ions demonstrated the applicability of thin films in the elimination of MO1, and the stability of the thin film has shown the potential applicability of thin-film catalysts. Further, the mechanism of photocatalytic degradation was demonstrated with the radical scavenger studies and ascertained the reaction pathways.
Zinc sulfate and magnesium sulfate were used as additives to provide an effective simultaneous mordanting and dyeing process (meta mordant) for wool yarns with madder dyes extracted by ultrasound. In ...the dyeing procedure, aluminum sulfate and ferrous sulfate were used as mordants. A response surface methodology (RSM) experimental design was used to optimize the dyeing technique. Results showed that the highest color strength of dyed samples was achieved at 105–110 min at 1:30 ratio of aluminum sulfate to zinc sulfate, 1:10 ratio of aluminum sulfate to magnesium sulfate, and pH of 2.5–3. It was observed that the dyeing of yarns with extracted dye and ferrous sulfate could be carried out without using additives. The color properties of dyed yarns using the novel approach were compared to samples dyed using the conventional method (pre-mordant). The findings revealed that dyed samples using the novel approach had the same or greater color strength as dyed samples using the pre-mordant procedure. L* , a* , and b* of the dyed yarns by extracted dyes and aluminum sulfate in the presence of magnesium sulfate were approximately the same with yarns dyed by the pre-mordant method. Also, the color fastness properties of dyed samples by meta mordant method were acceptable in terms of wash, light, and rub fastnesses. Nearly similar or better color stability was achieved compared to the common method. In this respect, a novel efficient one bath method was introduced for deep dyeing of wool yarns with extracted madder dyes which can decrease the negative environmental impacts such as pollutants, water consumption, and energy in comparison to other conventional methods.
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•A new strategy and efficient for dyeing of wool fibers with Rubia tinctorum dyes.•Eco-friendly dyeing of wool fibers with extracted madder dyes and safe mordants.•Performance of additives in simultaneous dyeing of wool fibers with madder dyes.•Reduction of effluents and saving energy and water in dyeing of wool with madder.
Although natural fibers used to be colored with natural dyes, today they have been replaced by chemical dyes and our cultural values have been abandoned. Metal salts harm both the nature and the ...human beings more than synthetic dyes do. This study examines the effects of both natural and chemical mordants on dyeing as well as the use of natural dye obtained from Sambucus Ebulus L. plant for dyeing Hemp fabric. In this study 100% hemp fabric was dyed with 15 different concentrations of 3 different mordant substances one of which was natural. Lightfastness and washing features of dyed hemp samples were done then color differences and color efficiency calculated by CIE L*a*b color space system were compared. For the optimization of dyeing parameters Grey Relational Analysis (GRA) method was used. Being one of the multi-criteria decision-making methods, GRA is the alternative and the most effective approach that can be employed in case of insufficient or discrete information, too much data, and vagueness. Experimental results show that the use of the natural mordant in dyeing the hemp fabric with Sambucus Ebulus L. plant gives better results in terms of color difference and color efficiency.
The extraction of natural dye using an aqueous method is a concept of green chemistry to avoid environmental pollution and toxicity. The present study was performed to improve the color strength and ...fastness properties of the fabrics by using natural dye and banana pseudo stem sap as a natural mordant. The natural dye was extracted from marigold flowers (Tagetes erecta) and optimized for dyeing of cotton and silk fabrics. The extraction of the dye was done in an aqueous solution without using any solvents. The optimum results were obtained when the fabric was dyed at 80°C for 60 min by keeping the mass to liquid ratio 1:40 at pH-7 (1.19). The color strength and CIELab (L*, a*, and b*) color parameters were also investigated. The effect of banana pseudo stem saps as a natural mordant on the color strength and fastness properties of the cotton and silk fabrics were evaluated and compared. The cotton fabrics were further characterized by FTIR spectroscopy and Scanning electron microscopy (SEM) to assess the physical and chemical changes after dyeing and mordanting.
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•Dyeing hemp with a natural yellow colorant from Buddleja officinalis.•Comparative research between natural mordants and metallic ones under different mordanting methods.•Expanded ...environmental-friendly dyeing based on ethnobotanical application.•Provided a case study is to explore new natural dyes for textile industry through ethnobotanical insight.
Natural dyes are more eco-friendly alternatives to synthetic dyes. This research focuses on natural dyes and improved dye craft using plants employed by various ethnic groups in Southwestern China. In this study, we assessed the suitability of dried extracts from Buddleja officinalis flowers for dyeing hemp fabric. and valuated indicators including color strength (K/S), color characteristics, and fastness properties in response to washing, rubbing, and perspiration using metallic and natural mordants under pre-, post-, and simultaneous mordanting conditions. Specifically, we investigated the pigment compound crocin by ultraviolet-visible spectroscopy and Fourier transform–infrared spectroscopy analysis before using it to dye hemp fabric. Optimum dyeing conditions including staining temperature, staining duration, and pH have been identified using an orthogonal array experimental design. Optimum results were achieved when dyeing at pH 5, and at 60 °C for 90 min. Hemp fabric dyed without mordant had a shade of yellowness, while fabric mordanted with gum rosin, plant ash, KAl(SO4)2, and Chaenomeles speciosa had a variety of pale to dark yellowness color shades. A darker yellow–green color shade was obtained with FeSO4 mordant. The color change of washing fastness was mostly very poor, while the color stain of washing and perspiration fastness were good to excellent, and rubbing fastness was also good to excellent. The color fastness was kept and improved by the three natural mordants, especially gum rosin and plant ash, but reduced by FeSO4. Those results show that the use of aqueous extract from B. officinalis flowers combined with natural mordants represents a promising approach for textile dyeing, revealing an alternative method that could improve and extend the dyeing properties of this indigenous dye plant. In addition, our findings lay the foundation for further basic studies and demonstrate the utility of preserving natural dye plants, along with the related traditional knowledge of indigenous groups in Yunnan, China.
The utilization of natural colorants in textile dyeing and printing has come to the forefront of production of textile goods. Extractions of natural dyes from waste materials and their utilization in ...coloration of textiles have positive impact economically and ecologically. In this study, red apple (Malus domestica) peel extract was used in dyeing of wool fabric in presence of mordant. Adopting pre-, meta-, and post-mordanting methods; four mordants were used; namely, Fe
+2
, Cu
+2
, Al
+3
, and Sn
+2
, were used in dyeing of wool with red apple peel (RAP) extract. The effects of various dyeing conditions; namely, dye concentration, pH, time, and temperature of dyeing on the dyeability of wool with RAP extract were studied. The dyeing characteristics of the dyed wool fabrics were assessed by determination of their color strength and the CIELAB color system. The kinetics of dye adsorption were investigated at the assigned optimum dyeing condition. Results of this study proved that the dyeing operation of wool fabric with RAP extract fits well with a second-order reaction. Wool fabrics dyed using meta-mordanting method exhibited adequate to very good fastness properties against washing, rubbing, perspiration, and light.
•Preparation of pure ZnO and new Li-doped ZnO, Ag-doped-ZnO and Ag-Li doped ZnO nanocomposites materials by sol-gel method and thoroughly characterized.•Photodegradation of organic dye pollutants ...such as acid red-1 and mordant orange-1dyes and textile wastewater under visible light irradiation.•Mechanistic studies established that the active species are hydroxy radials via several scavengers’ studies.
The study describes the preparation and characterization of pure ZnO, Li-ZnO (LZO), Ag-ZnO (AZO) and Ag-Li-ZnO (ALZO) nanostructures by sol-gel method, followed by their application as photocatalysts for the degradation of dyes acid red (AR1), mordant orange (MO1) and textile wastewater (TWW) under irradiation of visible light. The ALZO composite showed the highest photocatalytic efficiency among the tested samples with 95% degradation of dyes, which was three times higher than that of pure ZnO. The degradation reaction followed pseudo-first-order kinetics and the control trapping experiments corroborated the reactive species are hydroxyl radicals. The study also investigated the influence of various operational parameters on the photodegradation of dyes. The high photocatalytic efficiency of the ALZO material is mainly due to its highly porous structure with greater surface area, enhanced absorption of visible light, and a decreased recombination rate of electron-hole pairs. The ALZO catalyst had a band gap energy of 2.82 eV and exhibited the wurtzite ZnO hexagonal phase. The study highlights the effectiveness of doping metal oxides into semiconductor oxides to enhance photocatalytic activity and suggests the potential of the ALZO composite as a promising photocatalyst for dye degradation.
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