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Auteur Agusti Marsal
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IQAC-CSIC (Institute of Advanced Chemistry of Catalonia, Spanish National Research Council) - Barcelona - Spania
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Moisture adsorption/desorption kinetics of bovine hide powder / Albert M. Manich in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 94, N° 1 (01-02/2010)
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Titre : Moisture adsorption/desorption kinetics of bovine hide powder Type de document : texte imprimé Auteurs : Albert M. Manich, Auteur ; Fernando Maldonado, Auteur ; Josep Carilla, Auteur ; M. Catalina, Auteur ; Agusti Marsal, Auteur Année de publication : 2010 Article en page(s) : p. 15-20 Note générale : Bibliogr. Langues : Anglais (eng) Tags : Cuir Peau Cinétique Absorption/désorption Atmosphère humide Hygrométrie Essai Poudre bovine Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Three differently treated samples of bovine hide powder were subjected to adsorption/desorption kinetics from 5 to 95 % relative humidity in a thermogravimetric balance equipped with a controlled humidity chamber. As hygroscopic specimens take a very long time to reach equilibrium, testing times were shortened and kinetic models based on the experimental results were developed to calculate the adsorption at equilibrium, the time of half adsorption/desorption, the rate of half adsorption and the apparent coefficient of diffusion suggests that the rate of moisture adsorption is determined by the rate of diffusion inside the sample. En ligne : https://drive.google.com/file/d/1hV6eOT2GHWgrJDqjTnkRo0PRJL8YHog5/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8306
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 94, N° 1 (01-02/2010) . - p. 15-20[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 011957 - Périodique Bibliothèque principale Documentaires Disponible Moisture sorption/desorption of collagen / Albert M. Manich in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CV, N° 7 (07/2010)
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Titre : Moisture sorption/desorption of collagen Type de document : texte imprimé Auteurs : Albert M. Manich, Auteur ; Fernando Maldonado, Auteur ; Josep Carilla, Auteur ; M. Catalina, Auteur ; Agusti Marsal, Auteur Année de publication : 2010 Article en page(s) : p. 229-241 Note générale : Bibliogr. Langues : Américain (ame) Tags : Sorption/désorption Collagène Cuir 'Poudre de peau' 'Sorption dynamique vapeur' 'Brunaeur Emmett and Teller' (BET) 'Guggenheim, Andersen Boer' (GAB) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Moisture sorption/desorption of two physical forms of collagen (hide powder and leather) was studied. Despite the fact that the testing of sorption/desorption behavior is time consuming, the application of a Dynamic Vapor Sorption analyzer enabled us to characterize the sorption/desorption behavior of materials in a relatively short time. Differences in sorption and desorption can be related to the accessibility and internal tortuosity of the materials. BET and GAB models were used to analyze variations in monolayer sorption capacity (internal sorption surface) of different forms of collagen (hide powder and leather). Variations in the energy constants related to primary and secondary sorption were also considered. Given that tests in desorption were performed, the BET and GAB models were also fitted to desorption and the differences observed in the parameters were analyzed. A model of sorption-desorption for porous materials was devised to account for the differences between sorption and desorption. En ligne : https://drive.google.com/file/d/1rsA4uYRuzAn7zyFwTQxNmytTwMlJYPQn/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9722
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Code-barres Cote Support Localisation Section Disponibilité 012329 - Périodique Bibliothèque principale Documentaires Disponible Novel approach for the removal of organic contaminants in wastewaters : adsolubilization of 2-naphthol onto collagen fibres / Fernando Maldonado in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 97, N° 3 (05-06/2013)
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Titre : Novel approach for the removal of organic contaminants in wastewaters : adsolubilization of 2-naphthol onto collagen fibres Type de document : texte imprimé Auteurs : Fernando Maldonado, Auteur ; Albert M. Manich, Auteur ; Agusti Marsal, Auteur Année de publication : 2013 Article en page(s) : p. 105-110 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cinétique chimique
Collagène -- Solubilité
Dodécyl sulfate de sodiumLe laurylsulfate de sodium (LSS) ou dodécylsulfate de sodium (SDS) est un détergent et tensioactif ionique fort, couramment utilisé en biochimie et biologie moléculaire.
C'est un composé à ne pas confondre avec le laureth sulfate de sodium.
La concentration micellaire critique du SDS varie de 0,007 à 0,01 mol/L dans l'eau à 25°C.
Le dodécylsulfate de sodium (en anglais, Sodium Dodecyl Sulfate ou SDS ou/ NaDS), de formule C12H25NaO4S, aussi connu sous le nom de laurylsulfate de sodium (en anglais, sodium lauryl sulfate ou SLS), est un tensioactif ionique qui est utilisé dans les produits ménagers tels que les dentifrices, shampooings, mousses à raser ou encore bains moussants pour ses effets épaississants et sa capacité à créer une mousse, il est également repris comme additif alimentaire par le codex alimentarius (E487).
La molécule est composée d’une chaîne de 12 atomes de carbone, rattachée à un groupement sulfate conférant à la molécule les propriétés amphiphiles requises pour un détergent. Le SDS est préparé par sulfonation du dodécanol (alcool de lauryl, C12H25OH), suivie par une neutralisation par du carbonate de sodium. Le SDS est utilisé aussi bien dans les procédés industriels que pour les produits cosmétiques destinés au grand public.
Eaux usées -- Décontamination
Electrolytes
Isotherme d'adsorption
Naphtols
pH
Polluants organiques
ThermodynamiqueIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Research on adsolubilization to fibrous proteins, such as collagen, has received little attention despite its academic relevance and potential industrial applications.
The aim of this work was to study the influence of different parameters on adsolubilization onto collagen fibres using 2-naphthol as a model substance in order to verify the feasibility of this process in removing organic contaminants from wastewaters. The collagen fibres were previously or simultaneously treated with an anionic surfactant under mild acidic aqueous conditions to form the admicelles.
The following parameters were considered: shaking time, surfactant type (sodium dodecyl sulphate and sodium dodecylbenzene sulphonate); influence of pH; presence of electrolytes and polarity of the medium. Adsolubilization isotherms were obtained at 10, 20, 25, 30 and 35°C and the kinetic study of adsolubilization was also measured. Thermodynamic parameters such as enthalpy change, entropy change and free energy change were calculated by applying the van't Hoff equation for adsolubilization of 2-naphthol.
The higher adsolubilization capacity of 2-naphthol was reached at acidic pH and equilibrium was achieved after two hours of treatment. The presence of ethanol in the batch considerably lowered the adsolubilization capacity of fibrous collagen. Thermodynamic parameters indicated that the adsolubilization process is exothermic and spontaneous. The kinetic study revealed that adsolubilization of 2-naphthol onto collagen fibres is best described by a pseudo-second order model.
Our results open the door to the use of collagen fibres in the separation of organic contaminants from wastewaters through adsolubilization.Note de contenu : - AIM OF THE WORK
- EXPERIMENTAL PROCEDURES : Materials - Methods
- RESULTS AND DISCUSSION : Effect of shaking time - Effect of pH - Influence of the ionic strength - Influence of the polarity of the medium - Influence of the initial amount of SDS - Adsorption and adsolubilization isotherms - Influence of temperature. Thermodynamic parameters - Adsolubilization kinetics of 2-naphthol onto SDS-hpEn ligne : https://drive.google.com/file/d/1wUnnBflsaPkBGGOfprh42JyIx4Ky9koX/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18838
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 97, N° 3 (05-06/2013) . - p. 105-110[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 15193 - Périodique Bibliothèque principale Documentaires Disponible On the recovery of natural fat and non ionic surfactant from sheepskin degreasing / Agusti Marsal in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCIII, N° 7 (09/1998)
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Titre : On the recovery of natural fat and non ionic surfactant from sheepskin degreasing Type de document : texte imprimé Auteurs : Agusti Marsal, Auteur ; Albert M. Manich, Auteur ; M. de Castellar, Auteur ; Jaime Cot, Auteur Année de publication : 1998 Article en page(s) : p. 207-214 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Woolskins with high natural fat content are subjected to the degreasing process. When this is carried out with non ionic surfactant in aqueous medium, a highly polluting emulsion consisting of salt, water, natural fat and non ionic surfactant is obtained. In order to reduce the contamination load, and a sludge or "fat paste" made up of water, salt, natural fat and non ionic surfactant are obtained sparately. Given the constitution of this "fat paste", no use has been found up to now. The aim of this work is to separate the natural fat from the surfactant which are present in the "fat paste". A first extraction with n-Hexane:ethyl ether (40:10) of silicia impregnated with the "fat paste", allows the total recovery of skin natural fat which is slightly contaminated by a small amount of surfactant. A successive extraction of the silica with methanol allows the surfactant (nonylphenol with 8 M EtO) to be totally recovered. Note de contenu : - EXPERIMENTAL : Starting material - Spearation precedure - Regeneration of used silica gel - Analysis of the extracts
- RESULTS AND DISCUSSION : Determination of salt and water in the "fat paste" (optional) - "Fat paste"/silica gel ratio - Extraction of natural fat - Extraction of non ionic surfactant - Regeneration of used silica gel - Infrared spectrophotometryEn ligne : https://drive.google.com/file/d/1YwVK7QODIE84Ns8LmiHaDlBAxSTuXzNW/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4501
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Code-barres Cote Support Localisation Section Disponibilité 006967 - Périodique Bibliothèque principale Documentaires Disponible Optimization methods in leather research : Vegetable extract - aluminium salt combination tannage / Agusti Marsal in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXIX, N° 4 (04/1994)
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Titre : Optimization methods in leather research : Vegetable extract - aluminium salt combination tannage Type de document : texte imprimé Auteurs : Agusti Marsal, Auteur ; Albert M. Manich, Auteur ; E. Gratacos, Auteur ; J. Cot, Auteur ; M. Fort, Auteur Année de publication : 1994 Article en page(s) : p. 105-116 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : In this work the application of a optimization method (box-behnken design) to the vegetable-aluminum salt combination tannage is shown as an example of the application of these optimization methods to the leather sector.
The influence of the offer of both vegetable extract and aluminum salt as well as the mimosa/quebracho ratio in the vegetable extract mixture on the shrinkage temperature of the tanned skins and on the aluminum exhaustion is studied.
The best conditions of the studied variables to obtain a shrinkage temperature of 100°C and the highest aluminum exhaustion have been determined.En ligne : https://drive.google.com/file/d/15DxugTS_SGaXSZCPinIw3NajPI4jAgVF/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8086
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Code-barres Cote Support Localisation Section Disponibilité 006917 - Périodique Bibliothèque principale Documentaires Disponible Optimization of the chrome tanning process : influence of three types of commercially available masking agents / J. Gregori in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 77, N° 5 (09-10/1993)
PermalinkOxidising unhairing process with hair recovery / Agusti Marsal in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 86, N° 1 (01-02/2002)
PermalinkPhospholipid bilayers as vehicles of an anthraquinone disperse dye in leather dyeing / A. de La Maza in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXIX, N° 5 (05/1994)
PermalinkProcessing of collagenic residues. Isolation of gelatin by the action of peroxochromates / Jaime Cot in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCIV, N° 4 (06/1999)
PermalinkRecovery of organic nitrogen from beamhouse wastewater in a hair recovery process / Agusti Marsal in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 93, N° 5 (09-10/2009)
PermalinkRemoval of vegetable extracts by the use of activated clays / Agusti Marsal in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 87, N° 6 (11-12/2003)
PermalinkSalinity 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)
PermalinkStretching and stress-relaxation of leather / Albert M. Manich in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 90, N° 3 (05-06/2006)
PermalinkStudy of the dissipation of the electrostatic charge of leather / Agusti Marsal in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 79, N° 4 (07-08/1995)
PermalinkStudy on an unhairing process with hydrogen peroxide and amines / Agusti Marsal in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCV, N° 1 (01/2000)
PermalinkThe enzyme activity of trypsen on sheepskin trimmings in a two-step collagen extraction process / F. Fernandez-Hervas in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CII, N° 1 (01/2007)
PermalinkTransformation plant for converting chromium waste into chemical products for the leather industry / Jaime Cot in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIII, N° 3 (03/2008)
PermalinkUse of liposomes as auxiliary products in hide dyeing process / Agusti Marsal in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVII, N° 1 (01/2002)
PermalinkUse of liposomes as auxiliary products in hide dyeing process. Influence on the organoleptic and mechanical properties of dyed leather / Agusti Marsal in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVIII, N° 4 (04/2003)
PermalinkVegetable-zinc combination tannage on lamskin / Josep Maria Morera in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 80, N° 4 (07-08/1996)
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