21 research outputs found
Ecological contribution of Fenton process for generation of a ready-to-reuse dyeing and finishing effluent
No full textIn this study, real wastewater from a dyeing factory and previously treated by biological processes was decolorized by Fenton oxidation. Direct and reactive dyebaths and the related auxiliaries constituted the polluted effluents. A synthetic wastewater was also prepared in the same way in order to compare degradation performance. The study was performed with a systematic approach, searching optimum values of H2O2 and FeSO4 concentrations, pH, temperature and the chemical structure of each tested dye. Depollution results showed that the oxidation behaviour of synthetic and real wastewaters was very similar, especially during the first stage where the breaking of chromophore groups allowed fast colour removal. However, it was found that higher ratios of [H2O2]/[FeSO4] must be engaged in the case of real wastewaters. Results also showed that the catalytic oxidation yielded a fast and complete depollution at [H2O2]/[FeSO4] = 70, pH 3 and temperature 40°C. For experiments with direct dye, colour and COD removals were, respectively, 90% and 87% in the case of real wastewater. Reactive real wastewater showed non-stable oxidation evolution due to the hydrolysed dyestuff and this led to 83% and 45% decolourization and COD removal, respectively. Better depollution results were noted for the synthetic wastewater experiments. This finding was related to the non-stable composition of the real wastewater and the unknown chemical and physical interferences between its compounds. After sedimentation, reuse of the treated wastewater for new dyeing experiments was also investigated. For this purpose, the whole process was run under complete recycling mode and the previously treated effluent was re-used as fresh dyebath. Results in terms of colour depth and fastness showed that dyeing performances were very similar, and an important opportunity is offered by reusing wastewater treated by Fenton oxidation process
Color Formulation of Cotton Fabrics Using Multi-Objective Ant Colony Optimization
No full textThe formulation of colors is one of the most important aspects of colorimetry. For dyeing and finishing industries, mastering this step is a major problem to be solved. In this paper, a multi-objective ant colony optimization algorithm is developed to optimize the reproduction of the desired shades. The multi-objective function of the proposed algorithm minimizes simultaneously the CMC color differences and the metamerism index between the standard and the reproduced colors. Two ranges of dyes were used to dye cotton fabrics. The elaborated multi-objective algorithm showed good results with small values of color differences and metamerism index. All CMC color differences values were less or at the limit of the acceptability threshold of 1, and about 75% of samples exhibited minimum metamerism and are considered as a good match
Elaboration and Characterization of Polyurethane-based Microcapsules: Application in Textile
No full textUse of citric acid-plasticized polyvinyl alcohol for cotton warp yarns cold sizing
No full text241-250The properties of pure and citric acid-plasticized polyvinyl alcohol sizes in terms of viscosity, cohesive power, adhesive capacity, mechanical properties, and hairiness of sized yarns have been studied. Furthermore, pure and plasticized polyvinyl alcohol films are characterized by FTIR spectroscopy to describe intermolecular interactions. The morphology of sized yarns is studied by SEM images. It is confirmed that citric acid could enhance film properties, adhesion ability of polyvinyl alcohol to cotton fibres, hairiness, and mechanical properties of sized yarns. The desizeability of the prepared sizes is also checked and found high and efficient, which indicates that the citric acid-plasticized polyvinyl alcohol possess the application potential to cotton warp cold sizing
Antifouling processes and toxicity effects of antifouling paints on marine environment. A review
No full textApplication of ant colony optimization to color matching of dyed cotton fabrics with direct dyestuffs mixtures
No full textConcentrated natural dye extracted from turmeric spice and its use for textile dyeing
No full textOn a textile market where the rules move to the restriction of some synthetic dyes, the industrialists become interested by natural ones which are considered to be harmless. In addition, they constitute a new source of income since they allow the creation of a new market and they aim a specific group of consumers. During last few decades, increasing attention has been paid to natural dye application as food colourant, in cosmetics and in textile coloration. This work aims the extraction of a concentrated dye from turmeric spice and its application for textile dyeing. The extraction method using Soxhlet extractor yields a highly concentrated dye. The various parameters that may affect the dyeing process were investigated. It was found that pH and temperature of dyeing influence considerably the results. Quality control of all dyeing was performed using standard fastness tests and colour measurements. The results were promising for turmeric concentrated extract as a natural dye. Thermodynamics of dyeing process were investigated
Application of genetic algorithm to color recipe formulation using reactive and direct dyestuffs mixtures
No full textColour recipe prediction using ant colony algorithm: principle of resolution and analysis of performances
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