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Development of gold nanorods-based colorimetric method for the determination of formaldehyde in leather / Qingxiu Liu in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 104, N° 5 (09-10/2020)
[article]
Titre : Development of gold nanorods-based colorimetric method for the determination of formaldehyde in leather Type de document : texte imprimé Auteurs : Qingxiu Liu, Auteur ; Xiaotian Ziu, Auteur ; Jie Liu, Auteur ; Qin Shufa, Auteur ; Xuejing Zheng, Auteur ; Keyong Tang, Auteur Année de publication : 2020 Article en page(s) : p. 227-234 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorimétrie
Cuir -- Teneur en formaldéhyde
Cuirs et peaux -- Analyse
Nanoparticules
Or
Produits chimiques -- DétectionIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : A rapid and sensitive approach for colorimetric sensing of formaldehyde in aqueous solutions and leather has been developed based on the morphology-dependent localised surface plasmon resonance (SPR) properties of gold nanorods (AuNRs). The method relied on amalgamation between elemental mercury (Hg°) and AuNRs to generate significant colour change, which was dependent on the amount of Hg°. Upon formaldehyde introduction into the mixed solution of Hg2' and gold nanorods, formaldehyde would reduce Hg2+ to Hg° in an alkaline environnent, which results in the longitudinal plasmon wavelength of gold nanorods to blue shift accompanying a perceptible colour change from blue-green to purple. Under optimal conditions, the linear correlation could be fitted between 3.)%. and the concentration of formaldehyde ranging from 0.1 to 10mg/L with a linear correlation coefficient of 0.992. Relevant experimental parameters, including pH, concentrations of Hg2+, reaction time were evaluated. Meanwhile, the sensing mechanism for the detection of formaldehyde has been discussed. Due to its great applicability, simplicity and rapidity, the proposed colorimetric approach is promising to be applied to formaldehyde determination in leather. Note de contenu : - EXPERIMENTAL PROCEDURES : Chemical and instrumentation - Synthesis of AuNRs - Formaldehyde detection
- RESULTS AND DISCUSSION : Sensing mechanism - Optimisation of experimental conditions - Detection of formaldehyde - Selectivity of the sensing system - Detection of formaldehyde in tap water - A preliminary study on the detection of formaldehyde in leatherEn ligne : https://drive.google.com/file/d/12le_z8Vh3wAfAFtlL3Z9lZ-gqtyuzIB-/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34523
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 104, N° 5 (09-10/2020) . - p. 227-234[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 22289 - Périodique Bibliothèque principale Documentaires Disponible Efficient and ecological leather processing : replacement of lime and sulphide with dispase assisted by 1-allyl-3-methylimidazolium chloride / Hui Liu in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 4 (Année 2022)
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Titre : Efficient and ecological leather processing : replacement of lime and sulphide with dispase assisted by 1-allyl-3-methylimidazolium chloride Type de document : texte imprimé Auteurs : Hui Liu, Auteur ; Keyong Tang, Auteur ; Xiumin Li, Auteur ; Jie Liu, Auteur ; Xuejing Zheng, Auteur ; Ying Pei, Auteur Année de publication : 2022 Article en page(s) : 13 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chaux Sulfurée
Chlorure de 1-allyl-3-méthylimidazolium
Cuirs et peaux -- Industrie -- Aspect de l'environnement
Cuirs et peaux -- Propriétés physiques
Cuirs et peaux de bovins
Dispaseest une protéase qui clive la fibronectine , le collagène IV et dans une moindre mesure le collagène I. Elle se trouve dans certaines bactéries et peut être isolée à partir de filtrats de culture de Bacillus polymyxa . Il peut être extrait, purifié et utilisé dans la recherche. Il peut être particulièrement utile de séparer les épithéliums embryonnaires et le mésenchyme . La Dispase II est spécifique du clivage des liaisons leucine - phénylalanine .
La Dispase est souvent utilisée pour digérer les cellules primaires adhérentes en culture, car ce traitement s'est avéré plus doux que la digestion à la trypsine. (Wikipedia)
Eaux usées -- Analyse
Epilage
Produits chimiques -- Suppression ou remplacement
Ressources renouvelables
Stabilité hydrothermaleIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Leather is a collagen-based biomass prepared from raw skins or hides by a series of unit operations, in which the unhairing and fiber opening are extremely important operations. However, the conventional Na2S/Ca(OH)2 system used in unhairing and fiber opening has given rise to the pollution to the environment. It is necessary to develop substitute technology for the Na2S/Ca(OH)2. In the present study, 1-allyl-3-methylimidazolium chloride ([AMIm]Cl) was used to cooperate with dispase for cycle unhairing and one-pot beamhouse to recycle waste bovine hides and compared with conventional processing. During those processes, the mechanism of [AMIm]Cl-dispase synergistic unhairing and collagen fibers opening were studied. Besides, plant hazard, organic matter and [AMIm]Cl of wastewater from [AMIm]Cl-dispase process were respectively investigated and separated to evaluate the environmental and economic benefits of the [AMIm]Cl-dispase process. As a result, enzyme activity after unhairing by [AMIm]Cl-diapase system for using 5 times is higher than that by KCl-dispase system, and needs lower unhairing time, which is because of rapid penetration of [AMIm]Cl-dispase solution in bovine hides. For this reason, the tensile strength and elastic modulus of tanned leather from [AMIm]Cl-dispase process are higher than those from the KCl-diapase and conventional processes, and its hydrothermal shrinkage temperature is comparable to that of the conventional one. Because of the 58.13% lower wastewater discharge (WD), 66.60% lower total solids (TS), 97.23% lower ammonia nitrogen (NH3-N), non-toxic wastewater and organic matter recovery in wastewater are reached from [AMIm]Cl-dispase process, which is expected to be an alternative to the conventional process to reduce environmental pollution and realize the sustainable development of technology for leather manufacturing. Note de contenu : - EXPERIMENTAL PROCEDURES : Materials - Experimental and conventional processes - Investigation of the dispase penetration by FITC - Organic matter and saline solution separation in wastewater - The harm of wastewater to plant growth
- RESULTS AND DISCUSSION : Effect of [AMIm]Cl-dispase synergistic cycle unhairing - Effect of [AMIm]Cl-dispase ecological beamhouse - Hydrolysis of interfibrillar substance in hides - Distribution of dispase - Mechanism of one-pot beamhouse and recovery of organic matter in wastewater - Grain morphology and collagen fibers aggregation structure of tanned leathers - Physical and hydrothermal properties of tanned leather - Environmental and economic benefits
Table 1 : Physical properties and hydrothermal stability of tanned leathers from conventional (C), KCl-dispase (KCl/D) and [AMIm]Cl-dispase ([AMIm]Cl/D) processes
- Table 2 : Pollutant loads and wastewater discharge (WD) from different methods (unit: kg/t of raw hide)DOI : https://doi.org/10.1186/s42825-022-00086-3 En ligne : https://link.springer.com/content/pdf/10.1186/s42825-022-00086-3.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37580
in JOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 4 (Année 2022) . - 13 p.[article]Hydrogen peroxide-oxidized soybean polysaccharides as novel masking agents for zirconium tanning / Haolin Zhu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVI, N° 7 (07/2021)
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Titre : Hydrogen peroxide-oxidized soybean polysaccharides as novel masking agents for zirconium tanning Type de document : texte imprimé Auteurs : Haolin Zhu, Auteur ; Fang Wang, Auteur ; Keyong Tang, Auteur ; Jie Liu, Auteur ; Xuejing Zheng, Auteur ; Qin Shufa, Auteur Année de publication : 2021 Article en page(s) : p. 239-248 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse morphologique
Caractérisation
Cuirs et peaux -- Propriétés mécaniques
Cuirs et peaux -- Propriétés organoleptiques
Cuirs et peaux -- Propriétés thermiques
Cuirs et peaux de moutons
Granulométrie
Oxydation
Peroxyde d'hydrogèneLe peroxyde d'hydrogène (H2O2), communément appelé eau oxygénée ou encore perhydrol (appellation industrielle), est un composé chimique liquide et visqueux, aux puissantes propriétés oxydantes (il est aussi réducteur). C'est donc un agent blanchissant efficace qui sert de désinfectant et (à haute concentration) d'oxydant ou monergol dans les fusées spatiales.
PolysaccharidesLes polysaccharides (parfois appelés glycanes, polyosides, polyholosides ou glucides complexes) sont des polymères constitués de plusieurs oses liés entre eux par des liaisons osidiques.
Les polyosides les plus répandus du règne végétal sont la cellulose et l’amidon, tous deux polymères du glucose.
De nombreux exopolysaccharides (métabolites excrétés par des microbes, champignons, vers (mucus) du ver de terre) jouent un rôle majeur - à échelle moléculaire - dans la formation, qualité et conservation des sols, de l'humus, des agrégats formant les sols et de divers composés "argile-exopolysaccharide" et composites "organo-minéraux"(ex : xanthane, dextrane, le rhamsane, succinoglycanes...).
De nombreux polyosides sont utilisés comme des additifs alimentaires sous forme de fibre (inuline) ou de gomme naturelle.
Ce sont des polymères formés d'un certain nombre d'oses (ou monosaccharides) ayant pour formule générale : -[Cx(H2O)y)]n- (où y est généralement x - 1). On distingue deux catégories de polysaccharides : Les homopolysaccharides (ou homoglycanes) constitués du même monosaccharide : fructanes, glucanes, galactanes, mannanes ; les hétéropolysaccharides (ou hétéroglycanes) formés de différents monosaccharides : hémicelluloses.
Les constituants participant à la construction des polysaccharides peuvent être très divers : hexoses, pentoses, anhydrohexoses, éthers d'oses et esters sulfuriques.
Selon l'architecture de leur chaîne, les polysaccharides peuvent être : linéaires : cellulose ; ramifiés : gomme arabique, amylopectine, dextrane, hémicellulose et mixtes : amidon.
Rendement en surface
Tannage au zirconiumIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : A series of hydrogen peroxide-oxidized soybean polysaccharides (HPS) were prepared using H2O2 and copper catalyst, which were then used as novel masking agents for zirconium tanning. The HPS samples were characterized by Fourier transforms infrared (FT-IR) spectroscopy, dynamic light scattering (DLS), and X-ray diffraction (XRD). FT-IR suggested the formation of carbonyl and carboxyl groups after hydrogen peroxide oxidation. DLS indicated that the HPS particle size decreases with increasing the H2O2 dosage. HPS with carbonyl and carboxyl groups and medium particle size was able to coordinate with zirconium to remarkably facilitate the tanning process. The shrinkage temperature of the tanned leather reached 92oC. Meanwhile, the fullness, softness, and mechanical properties of the leather were greatly improved by the tanning. The function of HPS and its interaction with zirconium were studied by FT-IR, XRD, and it was found that the triple helical structures of collagen fiber were not changed greatly. Scanning electron microscopy (SEM) showed that collagen fibers were dispersed and tanning agents were evenly distributed in collagen fibers. A new strategy for chromefree tanning is suggested and a strong support for the application of zirconium tanning is provided. Note de contenu : - MATERIALS AND METHODS : Materials - Preparation of HPS - Tanning process - Characterization of HPS Fourier transform infrared (FT-IR) spectroscopy - X-ray diffraction (XRD) - Particle size analysis - Characterization of leather : Thermal and mechanical properties, thickening rate, color, morphological analysis, organoleptic properties and the structures of leather
- RESULTS AND DISCUSSION : Structure of polysaccharides - Particle size of HPS - Structure and properties of leather : Thermal properties of leather - Filling effect of leather - Mechanical properties - Color and area yield - Morphological analysis - Organoleptic properties - Tanning mechanism
- Table 1 : The zirconium tanning process of pickled sheepskin
- Table 2 : Particle size distribution (A-intensity average diameter, B-intensity) of HPS
- Table 3 : Mechanical properties of leather samples for different tanning processes
- Table 4 : Area yield, chromaticity and color difference of different samples
- Table 5 : Organoleptic properties of leather samples for different tanning processDOI : https://doi.org/10.34314/jalca.v116i7.4337 En ligne : https://drive.google.com/file/d/1dbxbSzXyUcLxk3DG0-1emkOrRQp26yeK/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36081
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXVI, N° 7 (07/2021) . - p. 239-248[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 22869 - Périodique Bibliothèque principale Documentaires Disponible Influence of retanning of the adsorption capacity of water on cattlehide collagen fibers / Keyong Tang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIV, N° 11 (11/2009)
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Titre : Influence of retanning of the adsorption capacity of water on cattlehide collagen fibers Type de document : texte imprimé Auteurs : Keyong Tang, Auteur ; Dominick J. Casadonte, Auteur ; Dennis C. Shelly, Auteur ; Jie Liu, Auteur ; Ming Yang, Auteur ; Xuejing Zheng, Auteur Année de publication : 2009 Article en page(s) : p. 367-374 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adsorption
Collagène
Cuirs et peaux
TannageIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : There are an abundance of hydrophilic groups in the collagen fibers in leathers. Because the affinity between these hydrophilic groups and water molecules varies with changes in temperature and relative humidity, leathers will adsorb or de-adsorb water as these factors change; affecting strength, permeability, and thermal stability. Retanning is a key operation in leather making with the purpose of retanning is to obtain leathers with some special characteristics. The water content in leathers, often 15-20 wt%, is an amount that cannot be neglected. However, few reports are found on the interactions between collagen and water, particularly the influence of retanning on the interaction between water and collagen fibers. The state that water molecules exist in collagen fibers, the mechanism for collagen fibers to adsorb water, the de-adsorption kinetics for water molecules to escape from collagen fibers, and the influence of retanning on the adsorption of water on collagen fibers need to be studied to improve the leathermaking technology for controlling the structure and behaviors of leathers. In this study, after being chrome tanned, collagen fibers were retanned with chrome, glutaraldehyde, TGR retanning agent (proprietary acrylic based), and wattle extract, respectively, to obtain different retanned samples. The water adsorption isotherms of the samples were determined by using a gravimetric method, by which the influence of retanning on the equilibrium water adsorption capacity and the influencing mechanism were evaluated. Different retanned samples varied in water adsorption characterization and equilibrium adsorption capacity. The TGR retanning increased the equilibrium adsorption capacity, while glutaraldehyde retanning decreased it; likely related to differences in retanning mechanisms. For different relative humidity environments, leathers should be retanned with different retanning agents to get an optimum property. Based on the adsorption characterization and the equilibrium adsorption capacity for the samples, different mathematics models were used to describe the adsorption process and the adsorption mechanism. Six models were chosen to fit the experimental data, and it was found that the Bradley model was the best to describe the adsorption. En ligne : https://drive.google.com/file/d/1Rv1WvrffcvoLu3ITj9Od-y-F5wT4O2l2/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=6385
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Code-barres Cote Support Localisation Section Disponibilité 011708 - Périodique Bibliothèque principale Documentaires Disponible Influence of sweat-soaking on the thermal stability of retanned and fatliquored cattlehide collagen fibers / Pengxiang Jia in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CII, N° 7 (07/2007)
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Titre : Influence of sweat-soaking on the thermal stability of retanned and fatliquored cattlehide collagen fibers Type de document : texte imprimé Auteurs : Pengxiang Jia, Auteur ; Keyong Tang, Auteur ; Jinglong Liu, Auteur ; Xuejing Zheng, Auteur Année de publication : 2007 Article en page(s) : p. 227-233 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Chrome tanned cattlehide collagen fibers were retanned and fatliquored by different chemicals. The samples were immersed in artificial sweat for 3 to 15 days. The sweat-soaked collagen fibers were then heated in air. The shrinkage temperature (Ts) and shrinkage ratio were recorded to characterize the thermal stability of the collagen fiber samples. It was found that the shrinkage ratio decreased after the processes of retanning and fatliquoring. After sweat-soaking treatment, the shrinkage temperature of the retanned and fatliquored collagen fibers was decreased and shrinkage ratio was increased, indicating an impaired thermal stability. The Ts decreased with the increase of the sweat soaking time. The chrome retanning liquor and GTA retanned collagen fibers exhibit slow decrease of shrinkage temperature with the increase of sweat-soaking time, showing great resistance to sweat. Compared with that fatliquored by other fatliquoring agents studied, collagen fibers fatliquored by neats- foot oil has better sweat-resistant property. En ligne : https://drive.google.com/file/d/1XJKs4BWu6JiNfPotO7hXC_f4TOjfmrRg/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3350
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CII, N° 7 (07/2007) . - p. 227-233[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 008081 - Périodique Bibliothèque principale Documentaires Disponible Kinetics and mechanism of thermal degradation of vegetable-tanned leather fiber / Jie Liu in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 1 (Année 2019)
PermalinkModification and application of aminosiloxane in fatliquoring / Keyong Tang in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 93, N° 6 (11-12/2009)
PermalinkModification of polyurethane finishing agent using collagen hydrolysate from chrome shavings / Keyong Tang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CV, N° 1 (01/2010)
PermalinkPreparation and properties of polyurethane finishing agent using butylamine as chain-extension agent / Keyong Tang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIV, N° 9 (09/2009)
PermalinkThermal shrinkage effects on the mechanical behavior of leathers / Keyong Tang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CV, N° 3 (03/2010)
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