Adsorption of dyes from aqueus solution by chromium-containing leather waste / Zhang Mina in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 88, N° 6 (11-12/2004)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 88, N° 6 (11-12/2004) . - p. 236-241 Titre : Adsorption of dyes from aqueus solution by chromium-containing leather waste Type de document : texte imprimé Auteurs : Zhang Mina, Auteur ; Bi Shi, Auteur Année de publication : 2004 Article en page(s) : p. 236-241 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorants -- Adsorption Cuir -- Déchets Cuir -- teneur en chrome Solutions aqueuses (chimie) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The adsorption behaviours were investigated of chromium-containing leather waste towards Acid Flavine G ( Acid Yellow 11; 18820) and Direct Pink 12B (Direct Red 31; 29100) in aqueous solution. The results indicated that both the acid dye and direct dye could be significantly adsorbed by this novel adsorbent. Acid pH values favor the adsorption and the adsorption capacity decreases with the increase of pH. The experimental data of adsorption isotherms of both the dyes fit well to the Langmuir model rather than the Freundlich model. The greatest amounts adsorbed of Acid Flavine G and Direct Pink 12B, at 293K, were 803.4mg/g and 798.7mg/g, respectively when the initial concentration of dye solution was 2000mg/L. The adsorption capacities of the dyes increased further with rising temperature. As the temperature was increased to 323K, the maximum adsorption amounts of Acid Flavine G and Direct Pink 12B reached 980.4mg/g and 1369mg/g respectively, which indicated that the mechanism of the adsorption might be chemical adsorption. The adsorption kinetics data can be well-described by the pseudo-second-order rate model. The adsorption capacities calculated by the pseudo-second-order rate model were close to those determined by actual measurement (error < 8 %). The column adsorption kinetics studies showed that the breakthrough points of Acid Flavine G and Direct Pink 12B were 30 and 40 bed volumes in the experimental system, which indicated that the adsorption column has a high availability for adsorption of dyes. Desorption studies showed that the Acid Flavine G adsorbed could be completely desorbed by using 0.1mol/L NaHCO3, but complete desorption of Direct Pink 12B was somewhat difficult. Note de contenu : - EXPERIMENTAL PROCEDURES : Materials - Influence of pH on adsorption - Adsorption isotherm studies - Adsorption kinetics studies - Column adsorption kinetics studies - RESULTS AND DISCUSSION : Proper pH value for adsorption - Adsorption isotherms - Adsorption kinetics - Column adsorption kinetics - Table 1 : Parameters obtained for the Langmuir isotherm model - Table 2 : Parameters obtained for the Freundlich isotherm - Table 3 : Adsorption kinetics parameters of dyes on chromium-containing leather absorbent (initial conc. 500mg/L, pH=3) En ligne : https://drive.google.com/file/d/1N6K4jS_TusSEBSnzKLcyE2-JY2hK2n_7/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39616 [article]

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Adsorption of surfactants on chromium leather waste / Zhang Mi-Na in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 90, N° 1 (01-02/2006)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 90, N° 1 (01-02/2006) . - p. 1-6 Titre : Adsorption of surfactants on chromium leather waste Type de document : texte imprimé Auteurs : Zhang Mi-Na, Auteur ; Liao Xue-Pin, Auteur ; Bi Shi, Auteur Année de publication : 2006 Article en page(s) : p. 1-6 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Adsorption Cuir -- Déchets Cuir -- teneur en chrome Surfactants Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : We have studied the adsorptions of aqueous solutions of three kinds of surfactants, anionic (sodium dodecylbenzenesulfonate, SDBS), cationic (dodecyl trimethylammonium bromide, DTB) and a non-ionic (Triton X-100, TX-100), by chromium-containing leather waste. The results indicated that the anionic surfactant can be significantly adsorbed by the waste material adsorbent over the pH range 4.0-8.0. The adsorption capacities of the cationic surfactant and non-ionic surfactant on the adsorbent are limited. These facts imply that the predominant adsorption sites of such an adsorbent are amino groups and the Cr(III) combined with collagen. The adsorption capacity of SDBS increased with the rise of temperature when the initial surfactant concentration was 2000mg/L, the greatest adsorption of SDBS at 293K was 375mg/g, reaching 423mg/g at 313K, which indicates that the mechanism of the adsorption process may be chemical adsorption. Higher ionic strength also leads to higher adsorption capacity. In general, the adsorption isotherms of SDBS on the adsorbent can be fitted by the Langmuir model. The adsorption kinetics data can be well described by the pseudo-second-order rate model. The adsorption capacities calculated by the pseudo-second-order rate model are close to those determined by actual measurements (error <10 %). The studies of column adsorption kinetics show that the breakthrough point of SDBS is around 150 x bed volume in the experimental system, which indicates the adsorption column has a high availability for the adsorption of anionic surfactant. Note de contenu : - EXPERIMENTAL PROCEDURE : Materials - Adsorption isotherms - Adsorption kinetics - Column adsorption kinetics - RESULTS AND DISCUSSION : Adsorption isotherm of surfactants on chromiumcontaining leather waste - Effect of temperature on the adsorption isotherm of SDBS - Effect of adsorbent dose on the extent of removal of SDBS - Effect of pH on the extent of removal of SDBS - Effect of electrolyte on the adsorption of SDBS - Adsorption kinetics - Column adsorption kinetics - Table 1 : Adsorption isotherm parameters of SDBS at different temperatures - Table 2 : Adsorption kinetics parameters of SDBS on chromium-containing leather waste adsorbent (303K) En ligne : https://drive.google.com/file/d/1uLQMO2flTuZoe1CbckZ3HF9p2ansvxvk/view?usp=share [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39176 [article]

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An integrated eco-friendly tanning method for the manufacture of upper leathers from goatskins / Subramanian Saravanabhavan in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 87, N° 4 (07-08/2003)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 87, N° 4 (07-08/2003) . - p. 149-158 Titre : An integrated eco-friendly tanning method for the manufacture of upper leathers from goatskins Type de document : texte imprimé Auteurs : Subramanian Saravanabhavan, Auteur ; Rathinam Aravindhan, Auteur ; Palanisamy Thanikaivelan, Auteur ; B. Chandrasekaran, Auteur ; Jonnalagadda Raghava Rao, Auteur ; Balachandran Unni Nair, Auteur Année de publication : 2003 Article en page(s) : p. 149-158 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Coût-Efficacité Cuir -- teneur en chrome Cuirs et peaux de chèvres Déchets -- Réduction Eau -- Consommation -- Réduction Eaux usées -- Analyse Epilage enzymatique Tannage au chrome Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Present leather-making processes cause difficulties, with regard to their perceived environmental impact. Pre-tanning and tanning processes contribute more than 90% of the total pollution load from leather processing. Conventional process methods subject the skin to wide variations in pH. Such pH changes, lead to salt formation which results in a net increase in COD, TDS, chlorides, sulphates and chromium levels in tannery wastewaters. In this study, a three-step process sequence has been explored to limit the pH range in leather processing to between 4.0-8.0. A sequence of operations, viz. enzyme unhairing, NaOH based fibre opening and pickle-less chrome tanning produces leathers matching the functional performance of conventionally processed leathers but leading to substantial environmental benefits in the reduction of COD and total solids by 43 and 70%, respectively. Water consumption for processing is reduced to 17.81/Kg raw hide. The process sequence explored appears to be economically viable. Note de contenu : - EXPERIMENTAL METHODS : - Standardisation of dehairing process - Standardisation of opening up of fibre bundles - Experimental tanning process (E) - Conventional tanning process (C, as followed in India) - EXAMINATION OF THE LEATHERS : - Input-output analysis - Scanning electron microscopic examination - RESULTS AND DISCUSSION : - Standardisation of dehairing system - Standardisation of NaOH for opening up of fibre bundles - INTEGRATED THREE STEP TANNING PROCESS : AN APPRAISAL - Softness measurements - Scanning electron microscopic analysis - Chromium in leather - OBJECTIVE AND SUBJECTIVE METHODS OF EVALUATION OF THE LEATHER - Strength characteristics - Tactile properties - Environmental benefits - Techno-economic viability - INPUT-OUTPUT AUDIT OF THE EXPERIMENTAL AND CONTROL PROCESS control process - Table 1 : Composition of depilatory mixture* for different methods of application - Table 2 : Extent of swelling and cross section pH of the pelts from preliminary fibre opening trials - Table 3 : Compression measurement and gradient data for control (C) and experimental (E) crust Leathers - Table 4 : Comparison of chromium content in wet blue leathers from control (C) and experimental (E) processes - Table 5 : Physical testing data of control (C) and experimental (E) leathers - Table 6 : Composite liquor analysis - Table 7 : Comparison of water requirement and discharge for control (C) and experimental (E) leather processing of 1 kg raw skins - Table 8 : Time and power consumption for the conventional (C) and experimental tanning (E) processes - Table 9 : Cost estimates of the conventional (C) and experimental tanning (E) processes - Table 10 : Input-output audit for both control and experimental process En ligne : https://drive.google.com/file/d/1jxj7vQuxr9IAA_lOPXzd04eZ-44Kkiva/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39771 [article]

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Aperçu sur la répartition du chrome et son influence sur la qualité du cuir / Raymonde Lasserre in REVUE TECHNIQUE DES INDUSTRIES DU CUIR, Vol. LXI (Année 1969)  

[article]  inREVUE TECHNIQUE DES INDUSTRIES DU CUIR > Vol. LXI (Année 1969) . - p. 207-216 Titre : Aperçu sur la répartition du chrome et son influence sur la qualité du cuir Type de document : texte imprimé Auteurs : Raymonde Lasserre, Auteur Année de publication : 1969 Article en page(s) : p. 207-216 Note générale : Bibliogr. Langues : Français (fre) Catégories : Cuir -- teneur en chrome Tannage au chrome Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Après une revue des divers facteurs pouvant influer sur la répartition du chrome dans l'épaisseur de la peau au cours du tannage avec référence à des travaux antérieurs. L'auteur s'attache particulièrement à montrer l'importance de l'hétérogénéité de la structure de la peau sur cette répartition, et l'importance de la localisation du point de prélèvement. Si l'on excepte les cuirs dont la couche de fleur présente un taux et une différence en Cr2O3 élevés par rapport aux couches internes. Il semble que la répartition du chrome dans le cuir joue moins sur la qualité que d'autres éléments caractéristiques du tannage lui-même et que les opérations postérieures au tannage, - en dehors de la texture du tissu fibreux original. Note de contenu : - Fig. 1 : Ponts de prélèvement-étude de Kritzinger et Theis - Fig. 2 : Coefficient de variation de la teneur en CrO2 entre les différentes couches de l'épaisseur du cuir d'après les résultats de Kritzinger et Theis Briggs - 1er Congrès U.I.S.C.I.C. Paris 1949 - Fig. 3 : Distribution stratigraphique du Cr2O3 dans des cuirs tannés avec liqueur de sulfate de chrome renfermant des quantités croissantes de formiate de sodium En ligne : https://drive.google.com/file/d/1JzHQ2axa4j4B4ueTgojsi6Wv3xopdrtY/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36660 [article]

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Correlation of chrome and fat content with leather strength / E. H. Bitcover in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXIII (Année 1978)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXXIII (Année 1978) . - p. 121-125 Titre : Correlation of chrome and fat content with leather strength Type de document : texte imprimé Auteurs : E. H. Bitcover, Auteur ; A. L. Everett, Auteur Année de publication : 1978 Article en page(s) : p. 121-125 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Croûte (cuir) On entend par "cuir en croûte" des cuirs ayant subi les opérations jusqu'au tannage, à l'exclusion de toute opération de corroyage ou de finissage, mais qui, par opposition aux wet-blue ont été séchés. Cuir -- teneur en chrome Cuirs et peaux -- Propriétés physiques Cuirs et peaux -- Teneur en matières grasses Cuirs et peaux de bovins Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : In a previous study a variety of physical properties and sorting character-istics of combat boot leathers made from comparable bullhides and steerhides were closely compared. The cattle involved had similar genetic and management backgrounds as well as similar ages and slaughter weights. That study anticipated a possible trend towards raising young bulls for beef because of potential economic advantages. Results of the study indicated that leather from bullhide was significantly stronger by a number of standard tests than leather from steer-hide. Since the leathers had been processed in three different tannery lots, there was latex some question as to whether this had produced differences in chemical composition which could result in differences in physical properties. Note de contenu : - Table 1 : Average chemical composition of crust leathers (percent) - Table 2 : Average physical test results for crust leathers - Table 3 : Correlation of physical test results with chrome and fat content of 39 crust sides En ligne : https://drive.google.com/file/d/1t4ffoRfjm_dOE5pXSaxVgV8bDBGFBZB3/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41148 [article]

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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)  

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Research on the composite and functional characteristics of leather fiber mixed with nitrile rubber / Guo Jun in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 3 (Année 2021)  

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Salinity reduction in the production of nappa skins by using agents with non-swelling capacity in pickling/tanning / Agusti Marsal in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 89, N° 6 (11-12/2005)  

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The structural and chemical properties of the nile perch fish leather / Peter Maina Wairimu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXV, N° 8 (08/2020)  

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Two stage chrome tanning system (basification in a separate float) influence of organic SO2 reduced chrome tan / Victor John Sundar in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 88, N° 1 (01-02/2004)  

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Uses for chrome leather waste - Chromium-enriched brewers yeast in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 90, N° 1 (01-02/2006)

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