Long-term releasing kinetics of chromium from leather / Wenjun Long in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVI, N° 12 (12/2021)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXVI, N° 12 (12/2021) . - p. 435-441 Titre : Long-term releasing kinetics of chromium from leather Type de document : texte imprimé Auteurs : Wenjun Long, Auteur ; Liangqiong Peng, Auteur ; Xiaofeng Jiang, Auteur ; Faming He, Auteur ; Whenhua Zhang, Auteur Année de publication : 2021 Article en page(s) : p. 435-441 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Composés organiques Cuir -- teneur en chrome Cuirs et peaux -- Analyse Lixiviation Température Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The release of chromium from leather inevitably results in potential risks and this study is conducted to investigate the long-term releasing behavior. The leaching tests proceed using water at solid to liquid ratio of 1:20 and rotational speed 60 r/min for 240 hours to simulate the release of chrome leather under natural conditions. The experimental data successfully fit with the Pseudo-second-order equation, Elovich equation, and Weber-Morris model, indicating the long-term leaching behavior of chromium in heterogeneous leather is controlled by liquid-solid film, while the interparticle and intraparticle diffusion also play important roles. The leachable chromium accounts for 2.8-4.5% total chromium in leather and increases with temperature. The Three-compartment model depicts the releasing process as rapid, slow, and very slow stages, and temperature mainly affected the very slow stage. The amount of released chromium in rapid and slow stages slightly increases with temperature, which could be used to assess the hazard of chrome leather. Note de contenu : - MATERIALS AND METHODS : Materials and reagents - Experimental method. Leaching experiment - Chromium analysis - The organics released - Scanning electron microscope and differential. Scanning calorimetry - Nitrogen adsorption analysis - RESULT AND DISCUSSION : Chromium released from leather at various temperatures - Kinetics analysis for Cr release - Elovich equation - The pseudo-second-order rate equation - Three-compartment model - Table 1 : Coefficients of determination (R2) for the kinetic models of chromium leaching from leather - Table 2 : The parameters of three-compartment model DOI : https://doi.org/10.34314/jalca.v116i12.4688 En ligne : https://drive.google.com/file/d/1AbRu_t61-UoxZ8fp8hu_K5vf47sLV_an/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36783 [article]

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