Adsorptive removal of Ni2+ from aqueous solution by low cost cellulosic adsorbent-adsorption kinetics and isotherm study / Sultan Alam in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 50, N° 2 (03-04/2013)

[article]  inTENSIDE, SURFACTANTS, DETERGENTS > Vol. 50, N° 2 (03-04/2013) . - p. 104-112 Titre : Adsorptive removal of Ni2+ from aqueous solution by low cost cellulosic adsorbent-adsorption kinetics and isotherm study Type de document : texte imprimé Auteurs : Sultan Alam, Auteur ; Noor-ul-Amin, Auteur ; Najeeb-ur-Rehman, Auteur ; Azmat Ullah, Auteur Année de publication : 2013 Article en page(s) : p. 104-112 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Absorbants et adsorbants Cellulose La cellulose est un glucide constitué d'une chaîne linéaire de molécules de D-Glucose (entre 200 et 14 000) et principal constituant des végétaux et en particulier de la paroi de leurs cellules. Cinétique chimique Coefficient de partage (chimie) Isotherme d'adsorption Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : Adsorptive removal of Ni2+ from aqueous solution by low cost cellulosic adsorbent was investigated with respect to adsorption kinetics and adsorption isotherm. Adsorbent was characterized by BET surface area, SEM, EDX, FTIR and Zeta potential technique and reported earlier. The surfaces contain carbonyl and hydroxyl functional groups, which act as binding sites for Ni2+ ion. Adsorption kinetics of Ni2+ was tested by first order, Elovich, parabolic diffusion and Bangham kinetic equations. Thermodynamic parameters like ?H?, ?S? and ?G? were calculated from the kinetic data. The rate of adsorption was high at high adsorption temperature. Positive values of ?S? reflect some structural exchange among the active site of the adsorbent and metal ion. Freundlich, Langmuir, Temkin isotherms and distribution coefficient were found fit to the adsorption isotherm data.. Note de contenu : - EXPERIMENTAL : Materials and instruments - Characterization - Adsorbent preparation - Adsorption kinetic - Adsorption isotherm study - RESULTS AND DISCUSSION : Characterization - Adsorption kinetics - Adsorption isotherm study DOI : 10.3139/113.110229 Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=17888 [article]

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Interfacial tensions, partition coefficients, and interfacial eelasticities : measures for emulsion stability ? / N. Buchavzov in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 44, N° 4/2007 (08-09/2007)

[article]  inTENSIDE, SURFACTANTS, DETERGENTS > Vol. 44, N° 4/2007 (08-09/2007) . - p. 230-238 Titre : Interfacial tensions, partition coefficients, and interfacial eelasticities : measures for emulsion stability ? Type de document : texte imprimé Auteurs : N. Buchavzov, Auteur ; F. Ravera, Auteur ; S. Hess, Auteur ; Y. Liu, Auteur ; U. Steinbrenner, Auteur ; C. Stubenrauch, Auteur Année de publication : 2007 Article en page(s) : p. 230-238 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Coefficient de partage (chimie) Emulsions -- Stabilité Rhéologie Tension superficielle Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : In this study the interfacial as well as the surface tensions, the partition coefficients Kp, the interfacial elasticities, and the stabilities of o/w-emulsions of the same systems were measured and compared to find a quantitative correlation which can help to control the emulsion stability. The systems in question contain water, paraffin oil and one of four non-ionic technical surfactants commonly used as emulsifiers. While a clear correlation between emulsion stability and equilibrium interfacial tension was found, the different emulsifying capacities cannot be explained by the partition coefficients Kp or the surface tension. However, combining the Kp results with the surface tension data allows us to estimate which emulsifier is more effective in solubilising a given amount of dispersed phase. Another method to classify emulsifiers is to carry out interfacial rheology measurements over a frequency range as broad as possible. Again a clear correlation between interfacial rheology and emulsifying capacity was found. This correlation, however, was restricted to surfactants of the same class. No correlation between interfacial rheology and emulsifying capacity could be found for emulsifiers of different molecular structure. DOI : 10.3139/113.100344 Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3211 [article]

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Physicochemical investigation and spectral properties of sunset yellow dye in cetyltrimethylammonium bromide micellar solution under different pH conditions / Muhammad F. Nazar in COLORATION TECHNOLOGY, Vol. 130, N° 3 (06/2014)  

[article]  inCOLORATION TECHNOLOGY > Vol. 130, N° 3 (06/2014) . - p. 191-199 Titre : Physicochemical investigation and spectral properties of sunset yellow dye in cetyltrimethylammonium bromide micellar solution under different pH conditions Type de document : texte imprimé Auteurs : Muhammad F. Nazar, Auteur ; Shahzad Murtaza, Auteur Année de publication : 2014 Article en page(s) : p. 191-199 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Coefficient de partage (chimie) Colorants Luminescence Micelles Modèles mathématiques pH Solubilisation Surfactants Index. décimale : 667.3 Teinture et impression des tissus Résumé : To mimic binding to biological membranes, the extent of interaction of the efficient food dye Sunset Yellow with a cationic surfactant, cetyltrimethylammonium bromide, was probed by quantifying its absorption and fluorescence emission spectra as a function of premicellar to post-micellar surfactant concentration. The characteristics of the partition behaviour and spectral-luminescent properties of Sunset Yellow–surfactant have been evaluated qualitatively as well as quantitatively for various cetyltrimethylammonium bromide concentrations. With the help of mathematical models, the water–micelle partition coefficient, the Sunset Yellow–cetyltrimethylammonium bromide binding constant, the binding capacity, and the degree of counterion binding were calculated at 25 °C under various pH conditions. The solubilisation of Sunset Yellow is also discussed from the thermodynamics viewpoint by considering the standard free energy change of dye solubilisation and the Sunset Yellow–cetyltrimethylammonium bromide binding energy. The high values of all these interactions indicate that the dye, being organic in nature, is partitioned largely from the aqueous environment to the palisade layer of the micelle. The solubilisation of the dye is enhanced by switching the pH to suppress the self-aggregation of dye molecules. Combined with electrostatic forces, the hydrophobic interactions also play a promising role in the solubilisation of Sunset Yellow in the outer core of the micellar interior. Note de contenu : - EXPERIMENTAL : Reagents - Procedure - UV-vis spectrophotometric measurements - Steady-state fluorescence measurements - RESULTS AND DISCUSSION : Effect of pH on the UV-vis spectrum of sunset yellow - Association of sunset yellow with cetyltrimethylammonium bromide - Degree of counterion binding - Number of dye molecules per micelle - Differential absorbance measurements - Partition constant and free energy changes - Relative solubility - Steady-state fluorescence spectroscopy study - Analysis of binding equilibria DOI : 10.1111/cote.12085 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12085 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=21447 [article]

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Study of interfacial tension in an acid-free oil/alkali/surfactant system / B.-X. Liu in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 48, N° 6 (11-12/2011)

[article]  inTENSIDE, SURFACTANTS, DETERGENTS > Vol. 48, N° 6 (11-12/2011) . - p. 484-487 Titre : Study of interfacial tension in an acid-free oil/alkali/surfactant system Type de document : texte imprimé Auteurs : B.-X. Liu, Auteur ; J. R. Hou, Auteur ; Y. Wang, Auteur ; H. J. Tang, Auteur ; Z. B. Lv, Auteur Année de publication : 2011 Article en page(s) : p. 484-487 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bases (chimie) Coefficient de partage (chimie) Huiles et graisses Sels Surfactants Tension superficielle Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : Experimental studies have been conducted to explore the interfacial tensions in an acid-free oil/alkali/surfactant system, and sodium hydroxide is used as the alkali chemical. The influences of salt and alkali on the interfacial activity of oil/surfactant systems were studied by the measurement of interfacial tensions and partition coefficients. The results showed that in an appropriate concentration range, an ultra-low interfacial tension could be obtained in the acid-free oil/alkali/surfactant system, and compared with the salt; the function of alkali for lowering interfacial tensions and improving partition coefficients is more significant. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12617 [article]

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