1-butyl-3-methylimidazolium acetate as an alternative solvent for type I collagen / Jie Liu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIX, N° 6 (06/2014)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CIX, N° 6 (06/2014) . - p. 189-196 Titre : 1-butyl-3-methylimidazolium acetate as an alternative solvent for type I collagen Type de document : texte imprimé Auteurs : Jie Liu, Auteur ; Zhou Xu, Auteur ; Chen Yi, Auteur ; Haojun Fan, Auteur ; Bi Shi, Auteur Année de publication : 2014 Article en page(s) : p. 189-196 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Chimie analytique Collagène -- Solubilité Solvants -- Suppression ou remplacement Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Low solubility and undesirable denaturation in conventional solvents continue to represent a significant challenge for efficient extraction, accurate characterization and versatile processing of collagen. In the present study, a room temperature ionic liquid (IL), 1-butyl-3-methylimidazolium acetate ([BMIM]Ac), was synthesized, and then evaluated as an alternative solvent for type I collagen. Real-time polarizing optical microscope observation indicated complete disintegration of hierarchical structure of collagen aggregates as solubilized in [BMIM]Ac at 25°C. The solubility reached up to approximately 8.0 wt.% at 25°C, more than ten times higher than that in conventional dilute acetic acid. In comparison with dilute acetic acid and recently reported chloridion ILs, high solubility of collagen in [BMIM]Ac at room temperature was ascribed to loose binding between [BMIM]+ and acetate, as well as stronger proton-accepting ability of [BMIM]Ac, which enabled rupture of those intermolecular hydrogen bonds and ionic bonds that stabilized collagen aggregates. However, such bond-rupturing effect was found selective at room temperature. As demonstrated by Fourier transform infrared, circular dichroism, atomic force microscope, and ultrasensitive differential scanning calorimetry analysis, [BMIM]Ac did not destroy the special triple-helical structure of tropocollagen molecules that had been identified as being of importance for the functional and bioactive properties of collagen. According to these results, the discovery of [BMIM]Ac as an ideal solvent for collagen may open up new possibilities for the chemistry and engineering of collagen, which has long been established as a readily accessible and renewable resource with many unique properties. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of [BMIM]Ac - Dissolution of collagen in [BMIM]Ac - Polarizing optical microscope (POM) observation - FTIR analysis - CD measurement - AFM observation - DSC measurement - RESULTS AND DISCUSSION : Dissolution mechanism of collagen in [BMIM]Ac - Triple-helical structure of collagen regenerated from [BMIM]Ac En ligne : https://drive.google.com/file/d/1sm3cYDSvhjqbYBv8WJIDxo4nbF5k-kaO/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=21517 [article]

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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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Adsorptive removal of As(V) from aqueous solution by Zr(IV)-loaded skin shavings / Jiao Limin in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIV, N° 9 (09/2009)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CIV, N° 9 (09/2009) . - p. 308-315 Titre : Adsorptive removal of As(V) from aqueous solution by Zr(IV)-loaded skin shavings Type de document : texte imprimé Auteurs : Jiao Limin, Auteur ; Xuepin Liao, Auteur ; Bi Shi, Auteur Année de publication : 2009 Article en page(s) : p. 308-315 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Absorbants et adsorbants Arsenic Cuirs et peaux -- Déchets Cuirs et peaux de porcs Déchets -- Elimination Isotherme d'adsorption Solutions aqueuses (chimie) Wet-white (tannage) Zirconium Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Wet-white shavings are one of the main solid wastes produced in the leather industry. In this paper, Zirconium (IV)-loaded adsorbent (ZrLA) was prepared by using wet-white shavings as the supporting matrix. The fundamental adsorption behaviors of this new adsorbent for arsenic [As(V)] were investigated. It was found that the adsorption capacity of ZrLA for As(V) in aqueous solution was 60.90 mg-g-1, when the initial concentration of As(V) was 75.0 mg. L-1 at pH 4.0 and the dosage of ZrLA was 1.0 g.L-1. The initial pH of As(V) solution significantly affected adsorption capacity of ZrLA to As(V) and the optimal pH for adsorption was in the range of 3.0-6.0. The adsorption isotherms of As(V) could be well fitted by the Langmuir equation, and the maximum adsorption capacities calculated by the Langmuir equation were close to those determined by experiments. The adsorption kinetics of As(V) on ZrLA could be satisfactorily described by the pseudo-second-order rate model. The adsorption capacity was increased with the increase of the zirconium content in ZrLA, and the highest adsorption capacity was obtained when zirconium content of ZrLA was 90-110 mg.g-1. Note de contenu : - EXPERIMENTAL METHODS : Materials - Preparation of Zr(IV)-loaded absorbent based on wet-white shavings - Preparation of As(V) stock solution - Effect of initial pH on adsorption capacity of ZrLA to As(V) - Adsorption isotherms - Effect of zirconium content in ZrLA on adsorption capacity - Adsorption kinetics - RESULTS AND DISCUSSION : Effect of initial pH on adsorption capacity of ZrLA to As(V) - Adsorption isotherm - Effect of the zirconium content in ZrLA on As(V) adsorption - Adsorption kinetics En ligne : https://drive.google.com/file/d/1UEbM9mmPakXpBVSI8vBe0FL-y0wo2W29/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=17835 [article]

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Alternative utilization of skin wastes-preparation of a fe(III)-loaded adsorbent for anionic dyes in aqueous solution / Yu-Lu Wang in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 90, N° 5 (09-10/2006)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 90, N° 5 (09-10/2006) . - p. 205-210 Titre : Alternative utilization of skin wastes-preparation of a fe(III)-loaded adsorbent for anionic dyes in aqueous solution Type de document : texte imprimé Auteurs : Yu-Lu Wang, Auteur ; Liao Xue-Pin, Auteur ; Ying-Chun Gu, Auteur ; Shi-Lin Zhao, Auteur ; Bi Shi, Auteur Année de publication : 2006 Article en page(s) : p. 205-210 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Absorbants et adsorbants Colorants -- Adsorption Colorants -- Elimination Colorants acides Cuirs et peaux -- Déchets -- Recyclage Fer Jaune Solutions aqueuses (chimie) Wet-white (tannage) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Fe(III)-loaded adsorbent (FLA) was prepared from waste wet-white. As a new adsorbent, its behaviour towards anionic dyes, Direct Yellow 11 (DY11) and Acid Yellow 11 (AY11), were investigated. It was found that the FLA is effective in removal of anionic dyes from aqueous solution and acidic pH favours the adsorption. The adsorption capacity of DY11 was significantly increased with an increase of temperature, whilst that of AY11 decreased, due to their difference in molecular structures. The maximum adsorption capacities of DY11 and AY11 at 323K were found to be 302.1 and 490.0 mg.g-1 respectively and the adsorption equilibrium data can be well fitted by the Langmuir model. The adsorption kinetics could be accurately described by a pseudo-second-order rate model. Investigation of column adsorption process indicated that FLA is effective in removal of AY11 from water, and the column can be regenerated by using dilute NH3 solution. Note de contenu : - EXPERIMENTAL SECTION : Materials - Methods - RESULTS AND DISCUSSION : Effect of initial pH on adsorption capacity - Effect of adsorbent dose on removal extent of dyes - Adsorption isotherms - Adsorption kinetics - Column adsorption kinetics - Table 1 : The Langmuir andFreundlich parameters of dyes on FLA at different temperatures - Table 2 : Adsorption kinetic model parameters of dyes on FLA En ligne : https://drive.google.com/file/d/1eIC6sbiqaeiyHpymGJ_mmT5jma51cL7U/view?usp=share [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39058 [article]

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Ammonia nitrogen in tannery wastewater : distribution, origin and prevention / Yanan Wang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVII, N° 2 (02/2012)  

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An environmentally friendly leather-making process based on silica chemistry / Yuansen Liu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CV, N° 3 (03/2010)  

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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)  

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Biodegradability of wastewater from enzymatic soaking and unhairing processes in leather Manufacture / Qiang He in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CI, N° 6 (06/2006)  

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Biodegradation of valonia tannin by endomyces shq 14 / Weng Huan in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 89, N° 1 (01-02/2005)  

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Biomass derived oligosaccharides for potential leather tanning / Zhicheng Jiang in COLLAGEN AND LEATHER, Vol. 5 (2023)  

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Characteristics of leather tanned with Nano-SIO2 / Haojun Fan in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. C, N° 1 (01/2005)  

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Chrome-reduced combination tanning for cleaner dyed sheep fur processing / Wei Ding in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CX, N° 11 (11/2015)  

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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)  

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Cleaner chrome tanning - A non-pickling process using an aliphatic aldehyde as pre-tanning agent / Luo Jian-Xun in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 96, N° 1 (01-02/2012)  

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A cleaner deliming process using sodium gluconate for reduction in nitrogen pollution in leather manufacture / Yunhang Zeng in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIII, N° 1 (01/2018)  

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Collagen fiber membrane-derived chemically and mechanically durable superhydrophobic membrane for high-performance emulsion separation / Huifang Li in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 3 (Année 2021)  

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A combination tannage based on aluminium and glycine-modified lignosulfonate / Zhou Jian in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 95, N° 5 (09-10/2011)  

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Construction of a chrome-free tanning system based on highly-oxidized starch–zirconium complexes / Yue Yu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVII, N° 3 (03/2022)  

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Dechroming of chromium-containing leather waste with low hydrolysis degree of collagen / Wei Ding in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 99, N° 3 (05-06/2015)  

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