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The roles of elevated temperature and carriers in the dyeing of polyester fibres using disperse dyes : Part 1 fundamental aspects / Stephen M. Burkinshaw in COLORATION TECHNOLOGY, Vol. 140, N° 2 (04/2024)  

[article]  inCOLORATION TECHNOLOGY > Vol. 140, N° 2 (04/2024) . - p. 149-207 Titre : The roles of elevated temperature and carriers in the dyeing of polyester fibres using disperse dyes : Part 1 fundamental aspects Type de document : texte imprimé Auteurs : Stephen M. Burkinshaw, Auteur Année de publication : 2024 Article en page(s) : p. 149-207 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorants -- Adsorption Colorants dispersés Catégorie de colorants très peu solubles dans l'eau, utilisés à l'origine comme colorants pour l'acétate, et qui généralement sont appliqués sous forme de suspensions aqueuses de faible concentration.Les colorants dispersés sont largement utilisés dans la teinture de la plupart des fibres manufacturées, surtout le polyester. Fibres polyesters Formulation (Génie chimique) Polyéthylène téréphtalate Solutions aqueuses (chimie) Teinture -- Fibres textiles synthétiques Index. décimale : 667.3 Teinture et impression des tissus Résumé : This review concerns the application of disperse dyes to poly(ethylene terephthalate) (PET) fibres using aqueous immersion dyeing processes and the roles of both elevated dyeing temperatures and carriers in such dyeing systems. This part of the paper presents a review of the fundamental properties and characteristics of PET fibres, disperse dyes and dyeing accelerants. In the next part of the paper, the various theories and concepts that have been proposed to explain the promotional effects imparted by elevated dyeing temperatures and carriers to disperse dye uptake on PET and other types of fibre, are reviewed and analysed, from the viewpoints of the essential physico-chemical aspects of both the aqueous disperse dye/PET and disperse dye/carrier/PET systems. Later parts of the paper will present a mechanistic model of the disperse dye adsorption process based on dye solubility as well as a novel plasticisation model of dye diffusion. Note de contenu : - INTRODUCTION : Background - Conventional models of the mechanism of disperse dye adsorption - Purpose of the review - Structure of the paper - THE AQUEOUS DISPERSE DYE/PET FIBRE AND DISPERSE DYE/CARRIER/PET FIBRE DYEING SYSTEMS - WATER - PET FIBRES : Classification - Usage - Manufacture - Structure - Properties of relevance to exhaust dyeing - Thermal properties - Water sorption properties - DISPERSE DYES : Classification - Usage - Aqueous solubility - Dispersing agents - Dye self-association - Dye formulation - Levelling agents - DYEING ACCELERANTS OR CARRIERS : IMMERSION DYEING OF PET FIBRES : HT dyeing - Carrier dyeing - Reduction clearing - Dyeability of PET fibres DOI : https://doi.org/10.1111/cote.12715 En ligne : https://drive.google.com/file/d/1GF6S7eF_QvXlTljNP_sv_GpHwtVI5vO0/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40937 [article]

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Electrochromic materials : Scope for the cyclic decay mechanisms and performance stability optimisation strategies / Yue Wu in COLORATION TECHNOLOGY, Vol. 140, N° 2 (04/2024)  

[article]  inCOLORATION TECHNOLOGY > Vol. 140, N° 2 (04/2024) . - p. 208-229 Titre : Electrochromic materials : Scope for the cyclic decay mechanisms and performance stability optimisation strategies Type de document : texte imprimé Auteurs : Yue Wu, Auteur ; Yogendra Kumar Mishra, Auteur ; Jian Xiong, Auteur Année de publication : 2024 Article en page(s) : p. 208-229 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Dispositifs électrochromiques Matériaux -- Détérioration Stabilité cyclique Index. décimale : 621.36 Optique appliquée Résumé : Electrochromic materials (ECMs) have important potential applications in the field of intelligent optoelectronic displays. However, ECMs and its devices cannot be truly applied on a large scale until the problem of their long-period performance degradation is really solved. This article focuses on summarising the attenuation mechanism of common ECMs, which is mainly divided into three types : structural damage, irreversible reaction and ion capture, and summarises four optimisation strategies for the cyclic stability of ECMs at the present stage: doping is used to change the internal structure of the material in order to achieve the purpose of improving the cyclic stability; composite means to allow a variety of materials to interact with each other in order that the original material has no excellent performance; improve the cyclic stability of ECMs by the special characteristics of nanostructures; and enhance the performance by optimising the preparation process and regulating the parameters in the preparation process. Finally, the article discusses the potential for optimising the long-term stability of ECMs in the future, based on the earlier-mentioned research. Note de contenu : - CLASSIFICATION AND MECHANISM OF ECMS DECAY MECHANISMS OF ECMS : Structure damaged - Non-reversible reaction in the reaction process - Ion trapping occurs during the cycling process - OPTIMISATION STRATEGIES FOR STABILITY OF ELECTROCHROMIC PERFORMANCE : Elemental doping - Material composite approach - Nanostructure-fabrication - Optimised preparation process DOI : https://doi.org/10.1111/cote.12729 En ligne : https://drive.google.com/file/d/1Sbpqv6Ax2U4iA0USUcSKAwF0fSEwOCXb/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40938 [article]

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Solubility prediction of CI Disperse Red 4 and CI Disperse Red 15 in supercritical carbon dioxide based on the back propagation neural network / Jun Yan in COLORATION TECHNOLOGY, Vol. 140, N° 2 (04/2024)  

[article]  inCOLORATION TECHNOLOGY > Vol. 140, N° 2 (04/2024) . - p. 230-238 Titre : Solubility prediction of CI Disperse Red 4 and CI Disperse Red 15 in supercritical carbon dioxide based on the back propagation neural network Type de document : texte imprimé Auteurs : Jun Yan, Auteur ; Shuang Du, Auteur ; Jinhua Hu, Auteur ; Kazuhiro Tamura, Auteur ; Hong Li, Auteur Année de publication : 2024 Article en page(s) : p. 230-238 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorants -- Solubilité Colorants dispersés Catégorie de colorants très peu solubles dans l'eau, utilisés à l'origine comme colorants pour l'acétate, et qui généralement sont appliqués sous forme de suspensions aqueuses de faible concentration.Les colorants dispersés sont largement utilisés dans la teinture de la plupart des fibres manufacturées, surtout le polyester. Dioxyde de carbone Fluides supercritiques Réseaux neuronaux (informatique) Index. décimale : 667.2 Colorants et pigments Résumé : The solubility of 1-amino-2-hydroxy-4-methoxy-anthraquinone (CI Disperse Red 4) and 1-amino-2-hydroxy-anthraquinone (CI Disperse Red 15) in supercritical carbon dioxide was measured using a dynamic method over a temperature range from 343.15 to 373.15 K and a pressure range from 14 to 22 MPa. The experimental data are analysed by using the back propagation neural network constructed by MATLAB. In the back propagation neural network, the input layer consisted of two inputs, which are temperature and pressure, the output layer consisted of the solubility of dyes, and the hidden layer function was composed of a non-linear function. The results of the analysis showed that a good fitting level of 0.99 was obtained, which means that the back propagation neural network can accurately estimate the solubility data in supercritical carbon dioxide. Note de contenu : - EXPERIMENTS : Experimental materials - Apparatus and procedures - Experimental results - BP NEURAL NETWORK MODEL : BP neural network - Derivation of the BP neural network - Training process of the BP neural network - Training results analysis DOI : https://doi.org/10.1111/cote.12706 En ligne : https://drive.google.com/file/d/1-BZUja24GWvPtUQBYlRDIeLSXxxDmMpf/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40939 [article]

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Comparative study of different methods for the assessment of print nonuniformity and their correlation with the human visual system / Ivana Juric in COLORATION TECHNOLOGY, Vol. 140, N° 2 (04/2024)  

[article]  inCOLORATION TECHNOLOGY > Vol. 140, N° 2 (04/2024) . - p. 239-251 Titre : Comparative study of different methods for the assessment of print nonuniformity and their correlation with the human visual system Type de document : texte imprimé Auteurs : Ivana Juric, Auteur ; Suncica Zdravkovic, Auteur ; Nemanja Kasikovic, Auteur ; Sandra Dedijer, Auteur ; Magdolna Pal, Auteur ; Zivko Pavlovic, Auteur ; Igor Karlovits, Auteur Année de publication : 2024 Article en page(s) : p. 239-251 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Détection de défauts (Ingénierie) Etudes comparatives Evaluation Evaluation visuelle Impression numérique Marbrures (défauts) Taches (défauts) Index. décimale : 667.3 Teinture et impression des tissus Résumé : Print non-uniformity is the variation of optical density (reflection) on the print and can occur in several different types that can be classified into two basic groups: random and systematic variations. This article examines two types from each group of variations that are most commonly found in digital printing systems: blotches and streaks, where amplitude and size were varied. Three most commonly used methods for measuring the print nonuniformity were used: Grey Level Co-occurrence Matrix (GLCM), ISO 13660 and Integration (also Improved Integration) method. The results obtained by measuring were compared with a visual assessment to find the link between objective and subjective analysis and to define and determine which method/parameter is the best for the measurement of which type of print (non)uniformity. The obtained results indicate the possibility of selecting the measurement parameter, but that the choice of the parameter depends on the type of nonuniformity. It is concluded that in the case of the GLCM method, the entropy and energy parameters are strongly related to the visual assessment for all three sets of samples. These parameters can be used regardless of the type of nonuniformity. The ISO G parameter can be used to measure both graininess and mottling, while the ISO M parameter is only suitable for measuring mottling. Integration method could be used to measure systematic error. On the basis of conclusions of the research, it is possible to propose the development of an industrially applicable solution for measuring print nonuniformity of digitally printed samples. Note de contenu : - INTRODUCTION : Methods for quantification and analysis of print nonuniformity - Field size for the analysis of print nonuniformity - MATERIALS AND METHODS : Sample creation - Image acquisition - Objective methods - Visual assessment - RESULTS AND DISCUSSION : Correlation between objective methods and visual assessment DOI : https://doi.org/10.1111/cote.12708 En ligne : https://drive.google.com/file/d/1u6Yhltf8474GtNOGVhD_aJL_WHtIhLry/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40940 [article]

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Low-water-soluble reactive dyes for application in ultrafine polyamide/polyurethane synthetic leather / Dexiang Li in COLORATION TECHNOLOGY, Vol. 140, N° 2 (04/2024)  

[article]  inCOLORATION TECHNOLOGY > Vol. 140, N° 2 (04/2024) . - p. 252-261 Titre : Low-water-soluble reactive dyes for application in ultrafine polyamide/polyurethane synthetic leather Type de document : texte imprimé Auteurs : Dexiang Li, Auteur ; Wei Ma, Auteur ; Bingtao Tang, Auteur ; Shufen Zhang, Auteur Année de publication : 2024 Article en page(s) : p. 252-261 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorants réactifs Cuir synthétique Cuirs et peaux -- Teinture Polyamides Un polyamide est un polymère contenant des fonctions amides -C(=O)-NH- résultant d'une réaction de polycondensation entre les fonctions acide carboxylique et amine. Selon la composition de leur chaîne squelettique, les polyamides sont classés en aliphatiques, semi-aromatiques et aromatiques. Selon le type d'unités répétitives, les polyamides peuvent être des homopolymères ou des copolymères. Polyuréthanes Solidité de la couleur Index. décimale : 667.2 Colorants et pigments Résumé : Ultrafine polyamide/polyurethane synthetic leather (UP/PSL), with a highly natural leather-like appearance and touch, is widely used in many leather commodities. Generally, acid dyes, which are mostly used for dyeing UP/PSL, exhibit poor colour fastness. While, reactive dyes are well-known for their good colour fastness. However, reactive dyes are not used to dye UP/PSL because they are water-soluble and cannot stain the polyurethane (PU) in UP/PSL. In this study, five low water-soluble reactive dyes with good affinity for both polyamide (PA) and PU were synthesised and characterised using ultraviolet-visible and infrared spectroscopy, and mass spectrometry. All low-water-soluble reactive dyes were monoazo dyes with only one sulfonic group and two different functional groups. The reactive dyes were used to dye UP/PSL at 98°C and fixed at 90°C with 7-azatridecane-1,13-diamine as a crosslinking agent. For comparison, Eriofast Red-2B (ER-2B) was used to dye UP/PSL using a special dyeing procedure. ER-2B showed severe issues related to low utilisation and uneven dyeing, whereas the five low water-soluble reactive dyes exhibited better performance than ER-2B. Both the exhaustion and fixation of dyes 1 and 4 exceeded 90.0% when the dosage was less than 3.0% owf (on weight of fabric). In addition, they exhibited good levelling. The washing fastness of the five reactive dyes was excellent and higher than grade 4. The dry rubbing fastness was higher than grade 3-4. Therefore, UP/PSL can be satisfactorily dyed using the reactive dyes with a solubility of less than 1.0 g/L and meet the requirements of daily life applications. Note de contenu : - MATERIALS AND METHODS : Chemicals and instruments - Preparation of reactive dyes with low solubilities - Dyeing process - Measurements of colour strength and fastness - Dyeing results of PU in UP/PSL with low water-soluble reactive dyes and ER-2B - RESULTS AND DISCUSSION : Structures and UV-vis absorption spectra of the low water-soluble reactive dyes - Results of dyeing UP/PSL with low water-soluble reactive dyes - Colour fastness of UP/PSL dyed with five low water-soluble reactive dyes DOI : https://doi.org/10.1111/cote.12692 En ligne : https://drive.google.com/file/d/10-sAJ3RcR8wrRTGti-sf8xWLZ9y5Ww0i/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40941 [article]

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Indigo reduction by using microorganism: Comparison of reducing power between Dietzia sp. KDB1 and yeast (Saccharomyces cerevisiae) / Chanhee Jung in COLORATION TECHNOLOGY, Vol. 140, N° 2 (04/2024)  

[article]  inCOLORATION TECHNOLOGY > Vol. 140, N° 2 (04/2024) . - p. 262-269 Titre : Indigo reduction by using microorganism: Comparison of reducing power between Dietzia sp. KDB1 and yeast (Saccharomyces cerevisiae) Type de document : texte imprimé Auteurs : Chanhee Jung, Auteur ; Jong Il Rhee, Auteur ; Dong Il Yoo, Auteur Année de publication : 2024 Article en page(s) : p. 262-269 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Fibres de ramie Fibres végétales Glucose Indigo Microorganismes pH Réduction (chimie) Teinture Teinture -- Fibres textiles Index. décimale : 667.2 Colorants et pigments Résumé : This study aims to develop microbial indigo reduction by comparing the reducing power between Dietzia sp. KDB1 and yeast (Saccharomyces cerevisiae) at some reduction conditions. Oxidation–reduction potential (ORP), colour strength (K/S), and fluorescence intensity (FI) were applied to evaluate the reduction level as a function of microorganism concentration, pH, and glucose addition at 30°C. For both of the microbial systems, ORP decreased further −20 mV and K/S increased more than two by adding glucose. The reduction level became higher slightly by adding glucose, which played a role of metabolite in both of the reduction systems. Overall, reduction level of the yeast system was about a half of KDB1 system at the same reduction condition of 45 mL volume, 15 g/L natural indigo, 6 g/L reducing agents, pH 10.0, 30°C and glucose added. Note de contenu : - EXPERIMENTAL : Materials - Cultivation and quantification of strain - Indigo reduction and dyeing - Evaluation of reducing power - RESULTS AND DISCUSSION : Reducing power according to concentration and volume - Reducing power according to pH - Reducing power according to glucose addition DOI : https://doi.org/10.1111/cote.12712 En ligne : https://drive.google.com/file/d/1CJaeSpHiUQVRXu7moFZiMG81KM7vz8KY/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40942 [article]

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Enhancing the outline sharpness of crosslinked printed cotton fabrics using ethylene glycol diglycidyl ether / Liting Liang in COLORATION TECHNOLOGY, Vol. 140, N° 2 (04/2024)  

[article]  inCOLORATION TECHNOLOGY > Vol. 140, N° 2 (04/2024) . - p. 270-278 Titre : Enhancing the outline sharpness of crosslinked printed cotton fabrics using ethylene glycol diglycidyl ether Type de document : texte imprimé Auteurs : Liting Liang, Auteur ; Hong Li, Auteur ; Xiaoyu Cai, Auteur ; Yue Dai, Auteur ; Jun Yan, Auteur Année de publication : 2024 Article en page(s) : p. 270-278 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Coton Le coton est une fibre végétale qui entoure les graines des cotonniers "véritables"(Gossypium sp.), un arbuste de la famille des Malvacées. Cette fibre est généralement transformée en fil qui est tissé pour fabriquer des tissus. Le coton est la plus importante des fibres naturelles produites dans le monde. Depuis le XIXe siècle, il constitue, grâce aux progrès de l'industrialisation et de l'agronomie, la première fibre textile du monde (près de la moitié de la consommation mondiale de fibres textiles). Epaississants Ether diglycidylique d'éthylène glycol Gomme de guar La gomme de guar est extraite de la graine de la légumineuse Cyamopsis tetragonoloba, où elle sert de réserve d'aliments et d'eau. La gomme de guar est composée principalement de galactomannane, une fibre végétale soluble et acalorique. Le galactomannane est un polymère linéaire composé d'une chaine de monomères de mannose ((1,4)-beta-D-mannopyranose) auxquelles sont ramifiés par un pont 1-6 une unité de galactose. Le ratio entre le mannose et le galactose est de 2 pour 1, ainsi en moyenne une unité de galactose est ramifié tous les deux mannose sur la chaine. Par comparaison, il est de 4 pour 1 pour la gomme de caroube et 3 pour 1 pour la gomme tara. La gomme de guar est un additif alimentaire (E4124) largement utilisé dans l'industrie agro-alimentaire. Elle permet notamment d'alléger certaines préparations en remplaçant le rôle de l'amidon, de sucres ou de matières grasses. La gomme de guar est utilisée comme épaississant, stabilisant et émulsifiant dans les aliments grâce à sa texture uniforme et ses propriétés pour former des gels. Elle peut être utilisée dans les sauces, soupes, crèmes glacées et sorbets, produits de boulangerie et de pâtisserie, poudres, etc. Impression sur étoffes Pâtes d'impression Réticulants Sérigraphie Solidité de la couleur Index. décimale : 667.3 Teinture et impression des tissus Résumé : In the current study, to obtain environmentally friendly printed cotton fabrics with a clear contour edge, ethylene glycol diglycidyl ether (EGDE) as a crosslinking agent and guar gum as a thickener were used with natural madder dye. The solid content of the thickener was assessed to determine the optimal viscosity of the printing paste. Scanning electron microscopy images and colour depth (K/S) values were used to analyse the surface morphology and printing properties. The pattern outline of the printed cotton fabric was assessed with an optical microscope. Also, the overall fastness properties of the printed fabrics were evaluated. The results showed that when the solid content of guar gum was 2.5%, the viscosity of the printing paste was close to 10 000 mPa.s, which was suitable for printing cotton fabrics. Scanning electron microscopy analysis showed that most of the printing paste was removed during the washing process, and did not affect the microstructure of the cotton fabric. Compared with direct printed cotton fabrics, the K/S values of mordant and crosslinked printed cotton fabrics increased by 3.12 and 4.01, respectively. In the optical microscopy photographs, the mordant and crosslinked printed cotton fabrics displayed a clear outline sharpness of the printed pattern, and excellent printed products were obtained. The colour fastness to washing, rubbing and light of the crosslinked printed cotton fabric were significantly improved, reaching levels of 4-5. Note de contenu : - EXPERIMENTAL : Preparation of the printing paste and the screen-printing process - Analysis of printed fabrics - Chemical and colour characteristics - RESULTS AND DISCUSSION : Optimisation of the solid content of guar gum - Scanning electron microscopy - Colour appearance and outline sharpness analysis - Colour fastness DOI : https://doi.org/10.1111/cote.12709 En ligne : https://drive.google.com/file/d/1RZ45cemPjXr3H2cXkoG8J8IUZjjPSq16/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40943 [article]

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Digital ink-jet printing of regenerated cellulose nanofibrous mats with reactive inks / Asifa Sattar in COLORATION TECHNOLOGY, Vol. 140, N° 2 (04/2024)  

[article]  inCOLORATION TECHNOLOGY > Vol. 140, N° 2 (04/2024) . - p. 279-286 Titre : Digital ink-jet printing of regenerated cellulose nanofibrous mats with reactive inks Type de document : texte imprimé Auteurs : Asifa Sattar, Auteur ; Awais Khatri, Auteur ; Shamshad Ali, Auteur ; Farooq Ahmed, Auteur Année de publication : 2024 Article en page(s) : p. 279-286 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Acétate de cellulose L'acétate de cellulose est une matière plastique inventée en 1865. C'est l'ester acétate de la cellulose. Colorimétrie Encres réactives Evaluation Fibres cellulosiques Impression jet d'encre Impression numérique Impression sur étoffes Nanofibres Solidité de la couleur Index. décimale : 667.3 Teinture et impression des tissus Résumé : The versatility of nanofibres enables them to be used for various technological applications such as filtration, biomedicine and healthcare, composites, protective and functional textiles. Recently, in addition to the functional properties of electrospun nanofibrous mats, their aesthetic properties have been explored. Herein, attempts have been made to develop digital ink-jet printing of regenerated cellulose nanofibrous mats with reactive inks. First, a cellulose acetate polymer was created to fabricate electrospun cellulose acetate nanofibrous mats, which were then converted into regenerated cellulose nanofibrous mats through deacetylation. Next, the cellulose nanofibrous mats were treated with an alkaline solution then coloured with four (cyan, magenta, yellow and black) commercially available reactive inks by a digital ink-jet printing method using a piezoelectric digital ink-jet printer. Various parameters were investigated, including the optimal concentration of the pretreatment agents, fixation temperature and time, colour yield and the absorbency of the electrospun nanofibrous mats. The digital ink-jet printed cellulose nanofibrous mats exhibited excellent colour yield and colour fastness properties. Morphological analysis through scanning electron microscopy and chemical analysis through Fourier Transform–infrared were also carried out. Note de contenu : - EXPERIMENTAL : Materials - Fabrication of regenerated CNMs - Pretreatment of regenerated CNM - Digital ink-jet printing of regenerated CNMs - Colour assessment - RESULTS AND DISCUSSION : Effect of sodium bicarbonate concentration - Effect of sodium carbonate concentration - Effect of urea concentration - Effect of curing temperature - Effect of curing time - Colour fastness properties - Colour yield and colorimetric values of digital ink-jet printed CNMs - SEM morphological analysis - FTIR spectroscopic analysis DOI : https://doi.org/10.1111/cote.12713 En ligne : https://drive.google.com/file/d/1jlBxoJjMYw573eUGuX0ImXFsq2rMfnPP/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40944 [article]

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Segmented modelling and analysis of disperse dye concentration based on multidimensional spectrum / Jianxin Zhang in COLORATION TECHNOLOGY, Vol. 140, N° 2 (04/2024)  

[article]  inCOLORATION TECHNOLOGY > Vol. 140, N° 2 (04/2024) . - p. 287-299 Titre : Segmented modelling and analysis of disperse dye concentration based on multidimensional spectrum Type de document : texte imprimé Auteurs : Jianxin Zhang, Auteur ; Xuejiao Huang, Auteur ; Huayan Zheng, Auteur ; Miao Qian, Auteur Année de publication : 2024 Article en page(s) : p. 287-299 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse quantitative (chimie) Analyse spectrale Colorants -- Analyse Colorants -- Concentration Colorants dispersés Catégorie de colorants très peu solubles dans l'eau, utilisés à l'origine comme colorants pour l'acétate, et qui généralement sont appliqués sous forme de suspensions aqueuses de faible concentration.Les colorants dispersés sont largement utilisés dans la teinture de la plupart des fibres manufacturées, surtout le polyester. Index. décimale : 667.2 Colorants et pigments Résumé : Since the water-insoluble dispersing dye has both absorption and scattering characteristics, a spatial resolution hyperspectral measurement approach and experimental testing was proposed in this article, which can collect spectral and spatial data from samples simultaneously. The concentration of 81 groups of three-component disperse dye samples were measured. However, the hyperspectral data of dye solutions in the 420–800 nm band is saturated, resulting in the inability for multispectral data processing. A segmented concentration quantitative analysis model was developed. For the unsaturated band (420–510 nm), the partial least squares (PLS), the N-way partial least squares (NPLS), and support vector machine (SVM) models using the data points on the X-axis of a two-dimensional light intensity distribution map were established. The predicted performance of PLS model was worse slightly than that of the other two models, The coefficient of determination (R2) values of concentrations for red, orange and blue disperse dye were 0.888, 0.796 and 0.959, respectively. For saturated band (520–670 nm), the NPLS and SVM models using the data points on the X- and Y-axis were established. Results shows that the prediction accuracy of concentrations of the three-component disperse dye was increased by adding additional data points on the Y-axis, with R2 values of 0.944, 0.807, and 0.912, respectively. For the strong scattering band (680–800 nm), a SVM model was established, and R2 of concentration of the three dyes reached 0.974, 0.933 and 0.995, respectively. The results showed that multidimensional spectroscopy method can improve the prediction accuracy of component concentration of disperse dye solution, by using more spectral information from X and Y directions. Note de contenu : - PRINCIPLE AND METHOD : Spatial resolution spectroscopy - Hyperspectral imaging-based spatially resolved spectroscopy acquisition system - Diffusion inversion principle - Least square support vector machine - N-way partial least squares - Quantitative model performance evaluation index - EXPERIMENT : Experimental scheme - Experimental results - ANALYSIS AND PROCESSING OF EXPERIMENTAL DATA : Hyperspectral image feature analysis - Data preprocessing - Dimension reduction of hyperspectral data - Hyperspectral data modelling DOI : https://doi.org/10.1111/cote.12714 En ligne : https://drive.google.com/file/d/1GABFkG4hc667KfNZ3rKUI_qFWe8E8qLJ/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40945 [article]

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Rapid decolorisation of dyeing wastewater by FeIII(2,2′:6′,2″-terpyridine)activated peroxymonosulphate / Jianing Fan in COLORATION TECHNOLOGY, Vol. 140, N° 2 (04/2024)  

[article]  inCOLORATION TECHNOLOGY > Vol. 140, N° 2 (04/2024) . - p. 300-312 Titre : Rapid decolorisation of dyeing wastewater by FeIII(2,2′:6′,2″-terpyridine)activated peroxymonosulphate Type de document : texte imprimé Auteurs : Jianing Fan, Auteur ; Shouying Wu, Auteur ; Zixian Wang, Auteur ; Minglong Zheng, Auteur ; Miaomiao Zhang, Auteur ; Linping Zhang, Auteur ; Yi Zhong, Auteur ; Xiaofeng Sui, Auteur ; Hong Xu, Auteur ; Zhiping Mao, Auteur Année de publication : 2024 Article en page(s) : p. 300-312 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Catalyse Catalyseurs Colorants organiques Décoloration Eaux usées -- Analyse Eaux usées -- Décontamination Eaux usées -- Epuration Eaux usées -- Teneur en colorants Index. décimale : 667.2 Colorants et pigments Résumé : The discharge of coloured textile printing and dyeing wastewater causes environmental pollution. Disposing of wastewater efficiently, simply and with low consumption, is a problem that must be addressed. Herein, a catalytic method for rapid decolorisation of organic dyes was devised employing a terpyridine iron complex to activate oxidised permonosulphate. CI Acid Red 1 was used as the simulated pollutant, the influences of operating parameters on the fading effects of wastewater were explored. According to the results, the produced catalytic system exhibits a universal catalytic effect. Even when the dye concentration reaches 76.4 mg/L, the dyeing wastewater may be effectively decolorised. In addition, when anions (HCO3−, SO42−, Cl−) were present in the solution, the degradation effect of CI Acid Red 1 was still effective. Interestingly, active species such as sulphate radicals and singlet oxygen were detected in the catalytic degradation system by radical capture experiments. The removal rate of total organic carbon can achieve a percentage of 26.22% in 2 hours. This research provides a unique, enzyme-like catalytic system for the rapid breakdown of dye contaminants. Note de contenu : - EXPERIMENTAL : Materials and reagents - Preparation of FeIII(tpy) - Characterisation of the activator - Activator oxidation procedure - Analytical method - RESULTS AND DISCUSSION : Characterisation of FeIII(tpy) - The catalytic performance of catalysts - Influencing factors on the catalytic performance of catalysts - Effective active species of the catalytic system - Adaptability to different dyes - The effect of anions on the catalytic system - Mineralisation study DOI : https://doi.org/10.1111/cote.12710 En ligne : https://drive.google.com/file/d/1v3OwogxHIjaIJWQ6JTLC30HflWpRFqX9/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40946 [article]

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