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Application and properties of modified wook keratin composites as film-forming agent for leather finishing / Zeng Chunhui in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 98, N° 6 (11-12/2014)
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Titre : Application and properties of modified wook keratin composites as film-forming agent for leather finishing Type de document : texte imprimé Auteurs : Zeng Chunhui, Auteur ; Qi Lu, Auteur Année de publication : 2014 Article en page(s) : p. 269-274 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Allongement à la rupture
Composites
Couches minces -- Propriétés mécaniques
Cuirs et peaux -- Finition
EthanedialL'éthanedial ou glyoxal est un composé organique de formule brute C2H2O2 et de formule semi-développé O=CH-CH=O. Ce liquide de couleur jaune est le plus petit dialdéhyde existant. C'est aussi une forme tautomère de l'éthynediol (HO–C≡C–OH) .
Frottements (mécanique)
Hydroxyméthyle cellulose de sodium
Laine
Mélanges (chimie)
Perméabilité
Réticulation (polymérisation)
Solutions (chimie)
Traction (mécanique)
Vapeur d'eauIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : A series of wool keratin/hydroxymethyl cellulose sodium (CMCNa/glyoxal composite membranes were prepared via solution blending and cross linking modification technology. The optimization of composite films preparation was critically investigated via orthogonal experimental design. Experimental results indicated that the cross-linking agent had a greater effect on the mechanical properties of films. Under the optimal condition (keratin/CMCNa weight ratio : 5.5, 0.3% glyoxal, reaction time : 1h, reaction temperature: 37°C), the composite membrane showed good tensile strength and maximum elongation, which can be used as film-forming agent in leather finishing. Moreover, in contrast to casein, the application properties of the leather finished by modified keratin composite film were measured : tensile strength increased by 11.3%, elongation at break improved by 25.7% as well as water vapour permeability by 3.76 %, and wet rub resistance fastness improved from 3 to 4. However, air permeability decreased by 15.1%. SEM and FTIR analysis verified that it has good compatibility, strong hydrogen bonds and covalent bonds formed between cross-linking agent and raw material molecules. The product might be great potentiel for application in leather finishing as film-forming agent instead of casein. Note de contenu : - EXPERIMENTAL PROCEDURES : Materials - Preparation of wool keratin solution - Preparation of wool keratin/CMCNa/glyoxal composite membranes - Measurement of mechanical properties - Characterization - Application of modified wool keratin composite film in leather finishing - Determination of applied properties
- RESULTS AND DISCUSSION : SEM analysis - FTIR analysis - Orthogonal experiment results - Influence of cross-linking agent on mechanical properties - Application testingEn ligne : https://drive.google.com/file/d/1c5sNuqn9PQQCfw14uv6Ac4lbu0gDH0uN/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=22649
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 98, N° 6 (11-12/2014) . - p. 269-274[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 16734 - Périodique Bibliothèque principale Documentaires Disponible Preparation and application of modified corn straw as a biosorbent for Cr(VI) adsorption / Zeng Chunhui in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 103, N° 4 (07-08/2019)
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Titre : Preparation and application of modified corn straw as a biosorbent for Cr(VI) adsorption Type de document : texte imprimé Auteurs : Zeng Chunhui, Auteur ; Zhang Ye, Auteur ; Xu Zhang, Auteur ; Qi Lu, Auteur Année de publication : 2019 Article en page(s) : p. 213-218 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Adsorption
Biosorbant
Caractérisation
Chimie analytique
Chrome hexavalent
Eaux usées -- Epuration
Maïs et constituants
PailleIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Modified corn straw, MCS, was prepared by pretreatment and esterification modification technology. The optimisation and mechanism of Cr(VI) adsorption performance was critically investigated via orthogonal experimental design and single-factor comparison experiments. Experimental results indicated that the MCS dosage and pH value had the greatest effect on the Cr(VI) adsorption process. Moreover, the Cr(VI) adsorption rate (CrAR) and maximum adsorption capacity (CrAC) were 96.8 % and 121mg/g respectively under the optimal condition (MCS dosage : 0.04g, adsorption time: 45 minutes, pH3, adsorption temperature: 40°C, Cr(VI) initial concentration : 10mg/L), which was an increase of 10.3 times compared to unmodified corn straw. FTIR analysis testified that carboxyl and ester groups were introduced into the MCS. Meanwhile, it turned out that the cellulose structure ctf MCS was found to be more orderly by SEM analysis than that of CS. The MCS might show great potentiel for application in the adsorption of Cr(VI) in tannery wastewater as a new type of biosorbent. Note de contenu : - EXPERIMENTAL PROCEDURES : Materials - Preparation of modified corn stalk (MCS) - Adsorption tests of Cr(VI) by MCS - Characterisation
- RESULTS AND DISCUSSION : Orthogonal experiment results - Influence of MCS dosage on Cr(VI) adsorption - Influence of pH on Cr(VI) adsorption - Influence of temperature on Cr(VI) adsorption - SEM analysis - FTIR analysisEn ligne : https://drive.google.com/file/d/1_QV07J2Xpn1E49OcWjF4xdTICk767T2s/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32802
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Code-barres Cote Support Localisation Section Disponibilité 21085 - Périodique Bibliothèque principale Documentaires Disponible Preparation of maleic acid modified peanut shell adsorbent and its adsorption performance for Cr(VI) / Zeng Chunhui in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 106, N° 6 (11-12/2022)
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Titre : Preparation of maleic acid modified peanut shell adsorbent and its adsorption performance for Cr(VI) Type de document : texte imprimé Auteurs : Zeng Chunhui, Auteur ; Zhang Ye, Auteur ; Feng Hanjun, Auteur ; Qi Lu, Auteur Année de publication : 2022 Article en page(s) : p. 246-251 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Absorbants et adsorbants
Caractérisation
Chrome hexavalent
Coque d'arachideIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Peanut shell adsorbents prepared by microwave pretreatment and maleic acid modification technology, were used to study the adsorption properties for Cr(VI). Meanwhile, structural characterisation, optimisation of adsorption conditions, isotherm adsorption and adsorption kinetics were critically investigated through experiments and detection techniques. XRD analysis showed that the crystallinity of peanut shells decreased significantly after microwave pretreatment. FTIR analysis testified that carboxyl groups and ester groups were successfully introduced into the structure of maleic acid modified peanut shells (MMPS). The results of orthogonal test and single factor experiments indicated that pH value had the greatest effect on Cr(VI) adsorption process. Moreover, the Cr(VI) adsorption rate (CrAR) reached the maximum value of 99.3 % under the optimal condition (MMPS dosage: 6g, adsorption time: 45 minutes, pH3, adsorption temperature: 80°C, Cr(VI) initial concentration: 30mg/L), which was much higher than that of unmodified peanut shells. The adsorption behaviour conformed to quasi-second-order kinetic equation and Langmuir isothermal adsorption model, and the adsorption was dominated by monolayer. Note de contenu : - EXPERIMENTAL PROCEDURES : Raw materials and instruments - Pretreatement of peanut shells - Preparation of maleic acid modified peanut shell (MMPS) adsorbent - Adsorption tests of Cr(VI) by MMPS - Adsorption kinetics test - Isothermal adsorption test - Characterisation
- RESULTS AND DISCUSSION : XRD analysis - FTIR analysis - Orthogonal experiment results - Influence of pH on Cr(VI) adsorption - Adsorption kinetic model and analysis - Isothermal adsorption model and analysis
- Table 1 : Results and analysis processing of orthogonal experiments
- Table 2 : Kinetic parameters for the adsorption of MMPS on CR(VI)
- Table 3 : Adsorption isothermal parameters of Langmuir and Freundlich modelsEn ligne : https://drive.google.com/file/d/1SjwOX76ma1rIRt9NGce2YIYwaFI6iJGB/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38516
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 106, N° 6 (11-12/2022) . - p. 246-251[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 23756 - Périodique Bibliothèque principale Documentaires Disponible Preparation of wool keratin and application as formaldehyde scavenger for leather products / Zeng Chunhui in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 101, N° 4 (07-08/2017)
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Titre : Preparation of wool keratin and application as formaldehyde scavenger for leather products Type de document : texte imprimé Auteurs : Zeng Chunhui, Auteur ; Ma Yue, Auteur ; Qi Lu, Auteur Année de publication : 2017 Article en page(s) : p. 202-207 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Déchets organiques -- Recyclage
Extraction par micro-ondes
Formaldéhyde -- Elimination
Fourier, Spectroscopie infrarouge à transformée de
kératinesLa kératine est une protéine, synthétisée et utilisée par de nombreux êtres vivants comme élément de structure, et également l'exemple-type de protéine fibreuse.
La kératine est insoluble, et peut être retrouvée sur l'épiderme de certains animaux, notamment les mammifères, ce qui leur garantit une peau imperméable. Parfois, lors d'une friction trop importante, la kératine se développe à la surface de la peau formant une callosité. Les cellules qui produisent la kératine meurent et sont remplacées continuellement. Les morceaux de kératine qui restent emprisonnés dans les cheveux sont couramment appelés des pellicules.
La molécule de kératine est hélicoïdale et fibreuse, elle s'enroule autour d'autres molécules de kératine pour former des filaments intermédiaires. Ces protéines contiennent un haut taux d'acides aminés à base de soufre, principalement la cystéine, qui forment un pont disulfure entre les molécules, conférant sa rigidité à l'ensemble. La chevelure humaine est constituée à 14 % de cystéine.
Il y a deux principales formes de kératines : l'alpha-kératine, ou α-keratin, présente chez les mammifères notamment, dont l'humain, et la bêta-kératine, ou β-keratin, que l'on retrouve chez les reptiles et les oiseaux. Ces deux types de kératines ne présentent clairement pas d'homologie de séquence.
Chez l'être humain, la kératine est fabriquée par les kératinocytes, cellules se trouvant dans la couche profonde de l'épiderme. Les kératinocytes absorbent la mélanine (pigment fabriqué par les mélanocytes), se colorent et ainsi cette pigmentation de l'épiderme permet de protéger les kératinocytes des rayons ultraviolets du Soleil. (Wikipedia)
LaineIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : A Na2S/LiBr/SDS dissolution system was used to dissolve waste wool and extract wool keratin by microwave-assisted technology. The optimization of wool keratin preparation was critically investigated via orthogonal experimental design. Experimental results indicated that microwave time had a far greater effect than other parameters on wool dissolving process. Under the optimal conditions (microwave time : 10 minutes, 0.5mol/L Na2S, pH:10, reaction temperature : 80°C, 0.2mol/L LiBr), the wool dissolution rate (WDR) and keratin extraction rate (KER) were 98.8% and 69.6%, respectively. Wool keratin lias a rich amide structure as shown by FTIR analysis and can be used as free formaldehyde scavenger for leather products. Moreover, the application properties of keratin were evaluated by formaldehyde capture experiments. It turned out that the formaldehyde removal rate (FAR) achieved the highest peak at 52.5% by addition of 4% keratin formaldehyde scavenger (KFS) and a capture time of 1.5 hours. Meanwhile, the leather thickening rate (LTR) increased by 6.36%, which testified that KFS possessed a certain filling effect for leather samples at the same time as removing formaldehyde. Wool keratin might have a great potentiel for application in leather products as environment-friendly formaldehyde scavenger. Note de contenu : - EXPERIMENTAL PROCEDURES : Materials - Process of waste wool dissolution - Dialysis and purification of wool keratin - FTIR detection of wool keratin - Application of wool keratin as formaldehyde scavenger (KFS) in leather samples
- RESULTS AND DISCUSSION : Orthogonal experiment results - FTIR analysis - Application testingEn ligne : https://drive.google.com/file/d/1-b1C_q9kA48B3obdibodmsG2-8knYFj1/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28895
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Code-barres Cote Support Localisation Section Disponibilité 19176 - Périodique Bibliothèque principale Documentaires Disponible