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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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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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)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 96, N° 1 (01-02/2012) . - p. 21-26 Titre : Cleaner chrome tanning - A non-pickling process using an aliphatic aldehyde as pre-tanning agent Type de document : texte imprimé Auteurs : Luo Jian-Xun, Auteur ; Jing Li, Auteur ; Liao Xue-Pin, Auteur ; Zhang Wen-Hua, Auteur ; Bi Shi, Auteur Année de publication : 2012 Article en page(s) : p. 21-26 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Aldéhydes aliphatiques Prétannage Tannage au chrome Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Tannery effluent with high salinity can have a serious environmental impact. The pickling process that involves the use of sodium chloride and acids is one of the main origins of salt pollution. In this study, a non-pickling chrome tanning technology was developed. A macromolecular aliphatic aldehyde, PTA, was synthesized and employed to pre-tan bated pelt before chrome tanning go that the conventional pickling process was eliminated. It was found that PTA possesses moderate tanning property itself and favours the penetration of chrome, resulting in a chrome exhaustion of 90%. Meanwhile, the performance of leather was comparable to the conventionally processed leather in terms of hydrothermal stability and property evaluations. Note de contenu : - EXPERIMENTAL PROCEDURES : Materials - Scanning electron microscope analysis - Dyeing and fatliquoring of chrome tanned leathers - Pilot experiment and property determination of the leathers. - RESULTS AND DISCUSSION : Tanning characteristics of PTA - Comparison of non-pickling chrome tanning and conventional chrome tanning - Uptake od dyestuff and fatliquor in non-pickling and conventional chrome-tanned leathers En ligne : https://drive.google.com/file/d/1cUFL4yqhaBGMTGmRtHUwwDhxPT-r2I6o/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=13550 [article]

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Preparation of formaldehyde-free melamine resin using furfural as condensation agent and its retanning performances investigation / Zhou Ji-Bo in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIII, N° 6 (06/2018)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIII, N° 6 (06/2018) . - p. 198-206 Titre : Preparation of formaldehyde-free melamine resin using furfural as condensation agent and its retanning performances investigation Type de document : texte imprimé Auteurs : Zhou Ji-Bo, Auteur ; Li Pei-Lin, Auteur ; Jian-Fei Zhou, Auteur ; Liao Xue-Pin, Auteur ; Bi Shi, Auteur Année de publication : 2018 Article en page(s) : p. 198-206 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Colorimétrie Cuirs et peaux -- Analyse Cuirs et peaux -- Propriétés mécaniques Cuirs et peaux -- Propriétés physiques Douceur (toucher) Epaisseur -- Mesure Formaldéhyde -- Suppression ou remplacement Fourier, Spectroscopie infrarouge à transformée de Furfural Mélamine -- Synthèse Potentiel zeta Retannage Spectroscopie de la résonance magnétique nucléaire Taille des particules Température de retrait Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Amino resins are one of the most important retanning agents used in the leather industry. However, the generally presence of formaldehyde greatly restricts the widespread application of amino resins. In this study, furfural, an organic compound derived from biomass material, was used to substitute for formaldehyde in the synthesis of melamine resin based on an alkaline-acid procedure. The as-synthesized formaldehyde-free melamine resin (MRf) showed excellent performances in leather processing. FTIR and 13C-NMR were used to characterize the chemical structure of MRf. The particle size as well as zeta potential were also determined. The retanning performances of MRf indicated that the overall performances of MRf are comparable to conventional formaldehyde contained melamine resin (MR) and commercial melamine resin (CMR). In particular, the thickness of the leather retanned by MRf was enhanced around 10.33%, which is significantly higher than that of controls MR (6.16%) and CMR (5.94%). Color measurements showed that MRf imparted leather with higher dark intensity. This present work demonstrated that furfural could be a potential candidate to replace formaldehyde in the production of formaldehyde-free melamine resin. Note de contenu : - MATERIALS AND METHODS : Materials - Preparation of MRf resin - CHARACTERIZATION OF MRF : Fourier Transform Infrared (FTIR) spectroscopy analysis - Nuclear Magnetic Resonance ( NMR) analysis - Particle size and zeta potential determination - RETANNING PERFORMANCES OF MRF : Physical and mechanical characteristic of leather - Color measurements - Analysis of free formaldehyde content in leather - RESULTS AND DISCUSSION : Preparation of MRf - FTIR spectroscopy analysis of MRf resin - C NMR spectroscopy analysis - Particle size and zeta potential - RETANNING PERFORMANCES OF MRF : Absorption, thickening and softness of leather - Physical and mechanical characteristics of leather - Shrinkage temperature of leather, chromium concentration in spent liquor and formaldehyde content in leather - Color measurements En ligne : https://drive.google.com/file/d/12CWMptyjoA2fiMqA2-t3PL-Scy5xhxRO/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30689 [article]

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Synthesis and retanning performance of a novel melamine resin with ultralow formaldehyde content / Zhou Ji-Bo in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVIII, N° 1 (01/2023)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXVIII, N° 1 (01/2023) . - p. 23-35 Titre : Synthesis and retanning performance of a novel melamine resin with ultralow formaldehyde content Type de document : texte imprimé Auteurs : Zhou Ji-Bo, Auteur ; Liao Xue-Pin, Auteur ; Bi Shi, Auteur Année de publication : 2023 Article en page(s) : p. 23-35 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Absorption Caractérisation Cuir -- Teneur en formaldéhyde Cuirs et peaux -- Analyse Cuirs et peaux -- Propriétés mécaniques Granulométrie Mélamine -- Synthèse Mélamine à faible teneur en formaldéhyde Potentiel zeta Retannage Stabilité au stockage Tannage organique Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Diethanolamine, epichlorohydrin (ECH), and lysine were used to change the traditional synthesis route to address the formaldehyde emission issue of melamine resin (MR), and a novel waterborne MR retanning agent with ultralow formaldehyde content (MUF) was finally obtained. The structure of MUF was characterized by Fourier transform infrared spectroscopy, 13C nuclear magnetic resonance, and X-ray photoelectron spectroscopy, and its retanning performances in wet-blue and wet-white leathers were thoroughly investigated. Results showed that the formaldehyde content of MUF was 28.05 mg/kg, which was greatly lower than that of traditional MR (3550.23/2543.45 mg/kg), and the formaldehyde contents of chrome- and TWLZ-tanned leathers retanned by MUF were only 12.68 and 8.98 mg/kg, respectively. The thickening rates of MUF-retanned leather were up to 13.40% (chrome-tanned leather) and 9.58% (TWLZ-tanned leather), and MUF showed a satisfying overall performance in retanning leather. MUF is highly promising in practical application owing to its ultralow formaldehyde content, excellent stability in aqueous solution, and satisfactory retanning behaviors. Note de contenu : - MATERIALS AND METHODS : Materials - MUF preparation - TRP synthesis - CCI preparation - MUF synthesis - Characterizatio of intermediate and final products Fourier transform infrared (FTIR) spectroscopy analysis - Nuclear magnetic resonance (NMR) spectroscopy - X-ray photoelectron spectroscopy (XPS) analysis - Storage stability and release of formaldehyde content during storage - Particle size and isoelectric point (pI) analysis - Absorption of retanning and fatliquoring agents - Thickening rates of retanned leather - Physical and mechanical strength of leather - Determination of free formaldehyde content in leather - RESULTS AND DISCUSSION : Characterization of retanning agents (FTIR analysis - NMR - XPS analysis) - Storage stability and formaldehyde determination of retanning agents - Particle size and zeta potential - Retanning performances of MUF : Absorption rates of retanning and fatliuqoring agents - Physical and mechanical strengths - Determination of free formaldehyde in leather - Table 1 : Wet-blue retanning processes - Table 2 : Wet-white retanning processes DOI : https://doi.org/10.34314/jalca.v118i1.6413 En ligne : https://drive.google.com/file/d/1qaCrrRJcWk_9qkGPtrNZylyJt7DVhboY/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39162 [article]

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Synthesis of a waterborne melamine resin and its retanning behaviors investigation / Ning Guo-Qiang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVII, N° 7 (07/2022)  

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