Adsorption of chromium (III) from a tanning wastewater on kaolinite / E. L. Talvani in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 81, N° 4 (07-08/1997)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 81, N° 4 (07-08/1997) . - p. 143-148 Titre : Adsorption of chromium (III) from a tanning wastewater on kaolinite Type de document : texte imprimé Auteurs : E. L. Talvani, Auteur ; C. Volzone, Auteur Année de publication : 1997 Article en page(s) : p. 143-148 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The adsorption of chromium (III) from a tanning wastewater on a kaolinite was studied. Simultaneously, adsorptions of sodium, of chloride and of sulphate were analysed. Tests were carried out using solutions with a chromium (III) content ranging between 0.62-38.27 mmol/L. These solutions were prepared by dilution of the original wastewater without changing the ration of their constituents. The solutions before each adsorption test and the equilibrium solutions were characterised by chemical analysis, by X-ray diffraction, by scanning electron microscopy and by surface chemical analysis using an electron microprobe. The results obtained permitted us to determine the principal physico-chemical aspects of the adsorption of chromium (III) on kaolinite. Monomeric and polymeric species of chromium (III) were detected in the tannin gwastewater and in each of the solutions prepared from the original wastewater. The adsorption of chromium (III) rose steeply at low equilibrium concentrations and showed negligible changes at high equilibrium concentrations. The maximum chromium (III) adsorption determined was 0.108 meq/g of kaolinite over the concentration range studied. The Langmuir equation was used to quantify the chromium (III) adsorption. It was determined that d(001) spacing and crystal size of kaolinite changed with the chromium content, whereas, the changes of clay texture were minimal after each adsorption. Finally, it was established that the presence of chromium (III) was not homogeneous in the kaolinite bulk. En ligne : https://drive.google.com/file/d/1slEIL98qUe-wAk_rrZHskAPKfQc8kXWe/view?usp=share [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8021 [article]

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Characterization of solid tanning salts manufactured from iron (III) sulphate and potassium acid tartrate / E. L. Talvani in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 78, N° 2 (03-04/1994)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 78, N° 2 (03-04/1994) . - p. 50-54 Titre : Characterization of solid tanning salts manufactured from iron (III) sulphate and potassium acid tartrate Type de document : texte imprimé Auteurs : E. L. Talvani, Auteur ; N. A. Lacour, Auteur Année de publication : 1994 Article en page(s) : p. 50-54 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Preparation and the characterization of solid tanning salts from iron (III) sulphate and potassium acid tartrate (cream of tartar) were performed. The iron (III) sumphate was obtained as a by-product of the processing of titaniferous iron ores from the Province of Buenos Aires. The manufacture started with physical upgrading of the ore and the concentrate thus obtained was then digested with sulphuric acid. At the end of the reaction iron (II) sulphate heptahydrate was separated, and the separated iron (II) was oxidised and cream of tartar was added to stabilize the iron (III). Solid tanning salts were obtained by spray drying. The storage and stability of the preparations were measured as a function of the principal physicochemical parameters. Finally, the suitability of the solid tanning salts for the tannage of goat skins was determined. The evaluation of the tanned leathers was performed by means of physico-mechanical tests and chemical analyses. En ligne : https://drive.google.com/file/d/1C81pN5Dj8uOo14igcHUOIweaap37tnaE/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8387 [article]

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