An exploration of enhancing thermal stability of leather by hydrophilicity regulation : effect of hydrophilicity of phenolic syntan / Sun Qingyong in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 4 (Année 2022)  

[article]  inJOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 4 (Année 2022) . - 10 p. Titre : An exploration of enhancing thermal stability of leather by hydrophilicity regulation : effect of hydrophilicity of phenolic syntan Type de document : texte imprimé Auteurs : Sun Qingyong, Auteur ; Zeng Yunhang, Auteur ; Yue Yu, Auteur ; Ya-Nan Wang, Auteur ; Bi Shi, Auteur Année de publication : 2022 Article en page(s) : 10 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux -- Analyse Cuirs et peaux -- Teneur en eau Dynamique moléculaire Hydrophobie Phénoplastes Retannage Simulation, Méthode de Stabilité thermique Syntans Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Effect of retanning on the thermal stability of leather is eliciting increasing attention. However, the relationship between the hydrophilicity of retanning agents and the heat resistance of leather and the corresponding mechanism remain unclear. Herein, phenolic formaldehyde syntans (PFSs) were selected as models to explore the effect of the hydrophilicity of retanning agents on the thermal stability of retanned leather. The thermal stability of leather was closely correlated to the hydrophilic group content (sulfonation degree) of PFSs. As the sulfonation degree increased, the water absorption rate of PFSs and their retanned leathers decreased, whereas the thermal stability of leather increased. Molecular dynamics simulation results proved that the introduction of PFSs could reduce the binding ability of collagen molecules with water and thus decreased the water molecules around the PFS-treated collagen. These results may provide guidance for the tanners to select retanning agents reasonably to improve the thermal stability of leather. Note de contenu : - EXPERIMENTAL : Materials - Water adsorption behavior of PFSs - Retanning experiments - Analysis of leather - MD simulation - RESULTS AND DISCUSSION : Effect of DS on the water adsorption behavior of PFSs - Effect of DS on the water adsorption of PFSs retanned leather - Effect of DS on the thermal stability of PFSs retanned leathers - Table 1 : Retanning and fatliquoring processes - Table 2 : Sequence of the collagen peptide used for constructing collagen model - Table 3 : Simulation details - Table 4 : Adsorption kinetics parameters fitted by the pseudo-second-order rate model - Table 5 : Weight loss of PFSs retanned leathers and control leather at different stages and residual weight DOI : https://doi.org/10.1186/s42825-022-00096-1 En ligne : https://link.springer.com/content/pdf/10.1186/s42825-022-00096-1.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38217 [article]

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Efficient removal of total nitrogen from tannery wastewater by promoting denitrification with sodium acetate / Ma Xiaojian in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 103, N° 6 (11-12/2019)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 103, N° 6 (11-12/2019) . - p. 323-327 Titre : Efficient removal of total nitrogen from tannery wastewater by promoting denitrification with sodium acetate Type de document : texte imprimé Auteurs : Ma Xiaojian, Auteur ; Zhou Jianfei, Auteur ; Zeng Yunhang, Auteur ; Bi Shi, Auteur Année de publication : 2019 Article en page(s) : p. 323-327 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Acétate de sodium Chlorures Dénitrification Eaux usées -- Analyse Eaux usées -- Epuration Eaux usées -- Teneur en azote total Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Total nitrogen (TN) in tannery wastewater is difficult to remove completely, because the low C/N ratio of the wastewater leads to inadequate denitrification. Sodium acetate was used as an extra carbon source to improve the denitrification efficiency and the TN removal. The appropriate COD/TN ratio for denitrification using sodium acetate was 5.1, at which the TN concentration of tannery wastewater decreased by 95%. A much faster removal of TN was obtained by adding sodium acetate in denitrification than by adding common glucose. These results showed that sodium acetate was a high-quality carbon source for a complete and rapid denitrification of tannery wastewater. The denitrification efficiency decreased with decreasing temperature and increasing chloride concentration. However, when the carbon source was made sufficient by adding sodium acetate, complete denitrification was stil) obtained even at 15°C or 10000mg/L of chloride concentration. Note de contenu : - MATERIALS AND METHODS : Materials - Effect of temperature on anaerobic denitrification of wastewater - Effect of chloride concentration on anaerobic denitrification of wastewater - Analytical methods of pollution loads in wastewater - RESULTS AND DISCUSSION : Effect of addition of sodium acetate on anaerobic denitrification of tannery wastewater - Effect of temperature on anaerobic denitrification of tannery wastewater - Effect of chloride concentration on anaerobic denitrification of tannery wastewater En ligne : https://drive.google.com/file/d/1FUylPZ3JvBdPyCNZe4mIZkDmr_wPe0I3/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33211 [article]

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Evaluation and improvement of the oxidative stability of leather fatliquors / Yue Yu in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 3 (Année 2021)  

[article]  inJOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 3 (Année 2021) . - 10 p. Titre : Evaluation and improvement of the oxidative stability of leather fatliquors Type de document : texte imprimé Auteurs : Yue Yu, Auteur ; Min Huang, Auteur ; Jiaqi Lv, Auteur ; Zeng Yunhang, Auteur Année de publication : 2021 Article en page(s) : 10 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Antioxydants Essais accélérés (technologie) Huiles et graisses Produits de nourriture du cuir Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Fatliquor oxidation may give leather unpleasant odor, and excessive amounts of Cr(VI) and volatile organic compounds. The accurate evaluation and improvement of the oxidative stability of fatliquors are of great significance to high-quality leather manufacturing. We proposed a set of practical methods for evaluating the oxidative stability of fatliquors on the basis of oxidation induction time, change in iodine value (∆ IV), and change in acid value (∆ AV) under accelerated oxidation conditions (at 100 °C with 10 L/h of air). Oxidation induction time is a highly sensitive marker for quantifying the oxidative stability of fatliquors, and ∆ IV and ∆ AV that are low cost and easy to operate are useful in evaluating the oxidative stability of fatliquors when the oxidation induction time is less than 22 h. The number of double bonds in fatliquors is an important factor affecting oxidative stability. The sulfation modification of fatliquors that greatly reduces double bonds and the addition of antioxidants, especially butylated hydroxyanisole and butylated hydroxytoluene, markedly improve oxidative stability of fatliquors. Note de contenu : - MATERIALS AND METHODS : Materials - Accelerated oxidation tests for fatliquors - Attenuated total reflection Fourier transform infrared spectrum of modified rape oils - Accelerated oxidation tests for modified rape oils - Accelerated oxidation tests for sulfated rape oil with antioxidants - RESULTS AND DISCUSSION : Establishment of methods for evaluating the oxidative stability of fatliquors - Effect of modification method on the oxidative stability of fatliquors - Effect of antioxidant on the oxidative stability of fatliquors DOI : https://doi.org/10.1186/s42825-021-00070-3 En ligne : https://link.springer.com/content/pdf/10.1186/s42825-021-00070-3.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37554 [article]

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