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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Authentic Material, la start-up qui valorise les chutes de cuir / Juliette Sebille in LEATHER FASHION DESIGN (LFD), N° 1 (02/2019)  

[article]  inLEATHER FASHION DESIGN (LFD) > N° 1 (02/2019) . - p. 52-53 Titre : Authentic Material, la start-up qui valorise les chutes de cuir Type de document : texte imprimé Auteurs : Juliette Sebille, Auteur ; Etienne Belondrade, Photographe Année de publication : 2019 Article en page(s) : p. 52-53 Langues : Français (fre) Catégories : Cuir -- Déchets Déchets -- Valorisation Récupération (Déchets, etc.) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Lancée il y a 2 ans, la start-up toulousaine accompagne les entreprises pour valoriser les chutes et rebus de matériaux nobles dont le cuir. Forte d’une innovation technologique, élaborée avec le concours du CEMES-CNRS, et d’un réseau d’approvisionnement local, traçable et sécurisé, elle donne vie à de nouvelles matières, avec des propriétés de résistance supplémentaires. Note de contenu : - Le cuir : du recyclage à l'upcycling - L'innovation technologique moteur de créativité En ligne : https://leatherfashiondesign.fr/authentic-material-upcycling-cuir/ Format de la ressource électronique : Html Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32748 [article]

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Chromium(III) pigments : Use of leather wastes as alternative starting material / Kalarical Janardhanan Sreeram in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVI, N° 7 (07/2011)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CVI, N° 7 (07/2011) . - p. 219-225 Titre : Chromium(III) pigments : Use of leather wastes as alternative starting material Type de document : texte imprimé Auteurs : Kalarical Janardhanan Sreeram, Auteur ; Jonnalagadda Raghava Rao, Auteur ; Balachandran Unni Nair, Auteur Année de publication : 2011 Article en page(s) : p. 219-225 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Chrome trivalent -- Recyclage Chromite Cuir -- Déchets Diffractométrie de rayons X Incinération Pigments métalliques Récupération (Déchets, etc.) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Chromium containing leather wastes poses potentially significant challenges to the ecosystem when disposed of in landfills or when incinerated in the open. An attempt to recover chromium from such leather wastes so as to reduce the chromium that ends up in the landfill was studied. A method of recovery of the chromium in chromium tanned leathers by controlled closed furnace incineration and by employing the protein matrix as an energy source as well as a template for chromium(III) oxide synthesis is detailed. This method provides the advantage of reducing the chromium residues from the leather industry while producing chromite ore ultimately useful in the preparation of pigmented coatings. The dry pigment obtained was green colored and could be further processed and formulated as a pigmented coating (paint). When the chrome shavings were mixed with iron sulfate and then incinerated, a brown colored paint coating was achieved. The best conditions for zero generation/discharge of hazardous chromium(VI) were determined. The pigments developed were characterized in detail by XRD and SEM-EDAX. Photon correlation spectroscopy measurements indicate that the calcined pigments prior to further size reduction were in the range of 300-400 nm. En ligne : https://drive.google.com/file/d/1_VChVZ_rD7I0kqQV3B410GuK_-v8aPWo/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12031 [article]

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Chromium leachatiblity from leather waste and eco-toxicity under environmental conditions / Peng Liang-Qiong in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXV, N° 3 (03/2020)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXV, N° 3 (03/2020) . - p. 87-95 Titre : Chromium leachatiblity from leather waste and eco-toxicity under environmental conditions Type de document : texte imprimé Auteurs : Peng Liang-Qiong, Auteur ; Long Wen-Jun, Auteur ; Li Yue, Auteur ; Wen-Hua Zhang, Auteur ; Bi Shi, Auteur Année de publication : 2020 Article en page(s) : p. 87-95 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Chimie analytique Chrome Cuir -- Déchets Ecotoxicologie Environnement -- Etudes d'impact Evaluation Lixiviation Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Chromium (III) is currently used in leather manufacture worldwide and the attention has been centered on the alleged environmental impact of chromium in leather waste. The effects of liquid-solid ratio, pH, contact time, rotational speed and temperature on the leachability of chromium from leather waste and the eco-toxicity were evaluated to investigate the ecological impact under environmental conditions. The characterization of leachate included the determination of total Cr and total organics (TOC), analysis of UV-visible absorption spectra, as well as the toxicity test with Photobacterium phosphoreum. The liquid-solid ratio, extractant pH, contact time and temperature significantly affected the leachability of chromium and toxicity of the leachate, whereas rotational speed slightly affected the leaching behavior when beyond 100 RPM. The toxicity of the leachate was related to both the amount of released substance which was mainly affected by contact time and liquid-solid ratio, and the species which was mainly affected by temperature and extractant pH. Finally, three samples from different tannery corresponding to leather waste were leached and characterized by total Cr, TOC and toxicity test under the environmental conditions of liquid-solid ratio 20:1(mL/g), pH 7.0, contact time 8 hours, rotational speed 100 RPM and temperature 25°C. These results contributed to the risk assessment of stacking field and waste management of chrome-containing leather. Note de contenu : - MATERIALS AND METHODS : Materials - Leaching experiments - Chromium analysis - Total organics analysis - UV-visible absorption spectra - Toxicological assays - RESULTS AND DISCUSSION : Release behavior of chromium and organics from leather waste - Effect of liquid/solid ratio - Effect of pH - Effect of contact time - Effect of rotational speed - Effect of temperature - TECHNOLOGICAL ASSAYS : Effect of liquid/solid ration - Effect of pH - Effect of contact time - Effect of rotational speed - Effect of temperature - Assessment of chrome-tanned leather wastes DOI : https://doi.org/10.34314/jalca.v115i03.1626 En ligne : https://drive.google.com/file/d/16PobO8GJAa-9BnwXcmCU7RA3a3jZ-kix/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33886 [article]

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Cutting by-products from car leathers / Karl Flowers in INTERNATIONAL LEATHER MAKER (ILM), N° 53 (05-06/2022)  

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Detanning chromium leather waste / Abigail Clare in INTERNATIONAL LEATHER MAKER (ILM), N° 54 (07-08/2022)  

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Development of sustainable strategies for leather waste management through bacterial remediation / A. Sindhuja in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXV, N° 12 (12/2020)  

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Hydrolysis of chromium tanned leather waste : turning waste into valuable materials - A review / Bianca S. Scopel in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIII, N° 4 (04/2018)  

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Investigation into the hazards of finished Cr-tanned leather as both product and waste / Liangqiong Peng in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 103, N° 1 (01-02/2019)  

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Modification of chrome-tanned leather waste hydrolysate with epichlorhydrin / F. Langmaier in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 90, N° 1 (01-02/2006)  

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Modifying products of enzymatic breakdown of chrome-tanned leather wastes with glutaraldehyde / F. Langmaier in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 87, N° 2 (03-04/2003)  

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Recycl Leather ou l'avènement d'une matière issue de chutes de cuirs / Juliette Sebille in LEATHER FASHION DESIGN (LFD), N° 1 (02/2019)  

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La Réserve des Arts pour sourcer du cuir à petits prix / Juliette Sebille in LEATHER FASHION DESIGN (LFD), N° 1 (02/2019)  

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Revalorisation des chutes de cuir / Justine Martin in CTC ENTREPRISES, (05/2014)  

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Study on a new gypsum retarder from finished leather waste / Minggao Deng in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 106, N° 3 (05-06/2022)  

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The manufacture of leatherboard / Duncan Ferguson in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 68 (Année 1984)  

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Thermal characterization and pyrolysis of waste leather treated with CoCl2 and MnCl2 / E. Bañón in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVI, N° 2 (02/2021)  

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Use of solid leather wastes to producte value-added material / M. A. Habib in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 107, N° 6 (11-12/2023)  

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Utilization of chromium-tanned leather solid wastes in microencapsulation / Bugra Ocak in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVI, N° 7 (07/2011)  

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