Preparation and application of a high exhaustion chrome tanning auxiliary from limed fleshings / Hongjiao Liang in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 107, N° 3 (05-06/2023)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 107, N° 3 (05-06/2023) . - p. 98-105 Titre : Preparation and application of a high exhaustion chrome tanning auxiliary from limed fleshings Type de document : texte imprimé Auteurs : Hongjiao Liang, Auteur ; Jun Zhao, Auteur ; Yulu Wang, Auteur ; Jin Liqiang, Auteur ; Zhang Feifei, Auteur Année de publication : 2023 Article en page(s) : p. 98-105 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation Chaulage Collagène Cuirs et peaux -- Déchets -- Recyclage Cuirs et peaux -- Propriétés mécaniques Cuirs et peaux -- Propriétés thermiques Cuirs et peaux de chèvres Echarnage Epuisement des tanins Hydrolysats de protéines Morphologie (matériaux) Tannage au chrome Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The recycling of leather solid waste has become a key issue aimed at realising the sustainable development of the leather industry. Recently, more and more attention has been paid on the recycling of limed fleshings. In this paper, a new recycling method for limed fleshings is reported. First, collagen protein hydrolysate (CH) was obtained by hydrolysing limed fleshings under alkaline conditions, and then the CHwas modified with cyanuric chloride (TCT) to obtain a high exhaustion chrome auxiliary (HECA). The coordination of HECA with chromium salts was investigated by ultraviolet-visible (UV-Vis) spectrum. HECA was applied in the chrome tanning process as an additive. The chrome concentration in effluent, the shrinkage temperature and mechanical properties of the resultant wet-blue were determined. Thermogravimetric analysis (TGA), scanning electron microscopy (SEM) and X-ray diffraction (XRD) were used to analyse the properties of the obtained leather. The results show that HECA could coordinate with chromium salts and significantly improved the absorption and fixation of chrome salt into leather. When the amount of chrome tanning agent was 5% and the amount of HECA was 3%, the uptake of chrome tanning agent could be increased to 92.42%, the shrinkage temperature (Ts) of wet-blue leather could reach 102.8°C, the relative increases being 27.26% and 7.3°C, respectively, compared with the conventional tanning process. The obtained wet-blue leather demonstrated uniform grain, good fullness and improved mechanical properties. This recycling method provides a valuable insight of developing high exhaustion chrome tanning aid from limed fleshings, and consequently increases the economic and environmental benefits in leather production. Note de contenu : - EXPERIMENTAL PROCEDURES : Materials - Preparation of collagen protein hydrolysate (CH) - Preparation of high exhaustion chrome auxiliary (HECA) - Coordination of HECA with chromium salt - Application of HECA in tanning process - Characterisation - RESULTS AND DISCUSSIONS : Physicochemical index of CH - Characterisation of HECA - Coordination of HECA with chromium salt - Ts and chrome uptake rate - Thermal properties and morphology of the leather - XRD analysis of wet-blue leather - Mechanical properties of leather samples - Table 1 : Tanning process of pickled goat pelts - Table 2 : Basic characteristics of CH - Table 3 : Mechanical properties of leather samples En ligne : https://drive.google.com/file/d/1DMihbpPPdVi8PEOBB1qi5aQ0eQbtKieW/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39580 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
24110	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Tannery wastewater treatment : conventional and promising processes, an updated 20-year review / Jun Zhao in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 4 (Année 2022)  

[article]  inJOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 4 (Année 2022) . - 22 p. Titre : Tannery wastewater treatment : conventional and promising processes, an updated 20-year review Type de document : texte imprimé Auteurs : Jun Zhao, Auteur ; Qinglian Wu, Auteur ; Yuling Tang, Auteur ; Jianfei Zhou, Auteur ; Hongguang Guo, Auteur Année de publication : 2022 Article en page(s) : 22 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Adsorption Coagulation Cuirs et peaux -- Industrie -- Aspect de l'environnement Eau -- Epuration -- Traitement biologique Eaux usées -- Analyse Eaux usées -- Décontamination Eaux usées -- Recyclage Electrochimie Filtration Floculation Oxydation Tannage Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Mismanagement of various wastes especially waste water produced by tanning processes has caused serious environmental problems and ultimately impaired human health. Constant efforts have been making to alleviate the pollution of tannery wastewater (TWW), yet terminal treatment still takes dominance. In this review, research on TWW treatment from 2000 to 2021 was summarized, and main methods such as coagulation and flocculation, adsorption, biological treatment, membrane filtration, advanced oxidation process were briefly discussed. More detailed introduction was given to the method of electrochemical treatment since it has excellent performance such as environmental friendliness and high efficiency, hence attracting more and more research attention in recent years. In view of the harsh physi-chemical conditions of TWW, integrated or combined treatment methods are accordingly recommended with better performance and multi-function, however comprehensive studies on optimization of methods combination and cost-effectiveness are needed. The certain issues that the residue Cr in treatment sludge and high salinity in effluent still remain were put forward in this work and potential solutions were provided. Moreover, this review proposed the perspective that realizing multi-function, recycling, and intensification should be the developing direction for future TWW treatment. This review is expected to provide a general guide for researchers who aspire to ameliorate TWW pollution problems and understand various methods utilized in this field. Note de contenu : - CHARACTERISTICS OF TANNERY WASTEWATER - TREATMENT FOR TANNERY WASTEWATER : Flocculation and coagulation - Biological treatment - Membrane filtration - Advanced oxidation processes - Electrochemical treatment - Adsorption - Integrated methods - PROBLEMS TO BE SOLVED AND POTENTIAL SOLUTIONS - TWW TREATMENT FOR THE FUTURE - Table 1 Direct discharge standard of treated TWW in different countries - Table 2 Qualitative comparisons of all TWW treatment methods - Table 3 Selected reports (2010–2020) related to combined/integrated methods to treat real or synthetic TWW DOI : https://doi.org/10.1186/s42825-022-00082-7 En ligne : https://link.springer.com/content/pdf/10.1186/s42825-022-00082-7.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37577 [article]

Exemplaires

Code-barres	Cote	Support	Localisation	Section	Disponibilité
aucun exemplaire

---

1 (1 - 2 / 2)