Adsorption studies of basic green 4 from aqueous solution on Ca2+ exchanged clay / F. K. Bangash in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 48, N° 5 (09-10/2011)

[article]  inTENSIDE, SURFACTANTS, DETERGENTS > Vol. 48, N° 5 (09-10/2011) . - p. 366-374 Titre : Adsorption studies of basic green 4 from aqueous solution on Ca2+ exchanged clay Type de document : texte imprimé Auteurs : F. K. Bangash, Auteur ; S. Alam, Auteur ; M. Khan, Auteur Année de publication : 2011 Article en page(s) : p. 366-374 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorants -- Adsorption Diffractométrie de rayons X Fourier, Spectroscopie infrarouge à transformée de Microscopie électronique à balayage Spectrométrie à énergie dispersive Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : The adsorption of basic green 4 from aqueous solution on calcium exchanged clay (Attock-Ca and Swat-Ca) was studied. Clays were first purified and activated with H2SO4and then exchanged with Ca2+ions. Clay was characterized by BET surface area, XRD and SEM/EDS. The adsorption kinetic at 298 K and 306 K showed that the first order models were applied to the data. The rate constant increased with the rise in temperature of adsorption/activation. Thermodynamic properties (ΔE≠, ΔH≠, ΔS≠and ΔG≠) for the adsorption process were calculated. Positive values of ΔH≠showed that the adsorption of basic green 4 is endothermic. Positive values of ΔS≠reflected the increase in the disorder of the system at the solid-solution interface during adsorption. The Gibbs free energy, which is the driving force for adsorption is negative indicating spontaneous adsorption. Freundlich’s and Langmuir’s models described the equilibrium adsorption study and found to fit the experimental data. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12550 [article]

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Investigating the activity of zirconia as a catalyst and a support for noble metals, in green oxidation of cyclohexane / M. Sadiq in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 49, N° 1 (01-02/2012)

[article]  inTENSIDE, SURFACTANTS, DETERGENTS > Vol. 49, N° 1 (01-02/2012) . - p. 32-36 Titre : Investigating the activity of zirconia as a catalyst and a support for noble metals, in green oxidation of cyclohexane Type de document : texte imprimé Auteurs : M. Sadiq, Auteur ; S. Alam, Auteur ; F. Mabood, Auteur ; F. K. Bangash, Auteur ; M. Ilyas, Auteur Année de publication : 2012 Article en page(s) : p. 32-36 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Composés organiques volatils -- Oxydation Cyclohexane -- Oxydation liquides Surfactants Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : Green oxidation of cyclohexane by molecular oxygen was carried out over ZrO2 and noble metals (Pd and Pt) supported on zirconia in solvent free conditions. Studies have been carried out in a typical three-necked batch reactor. Reaction products were identified by GC and UV spectrophotometer. Reaction rates were determined as a function of temperature, partial pressure of oxygen, amount of catalyst, volume of reactants, agitation and reaction duration. The agitation effect and activation energy revealed the absence of mass transfer resistance. Experimental results unveiled the effect of morphology of ZrO2 on catalysis. 1.0 wt.% noble metal/ZrO2(m) was found more selective for cyclohexanol production at low temperature, agitation 900 rpm and partial pressure of 101.325 KPa while at high temperature cyclohexanol was further oxidized to cyclohexanone. Comparison of Pt/ZrO2 and Pd/ZrO2 catalysts was made on the basis of reactivity and selectivity. Catalysts were characterized by using BET surface area and pore size analyzer, XRD and SEM. To conclude shortly, for the oxidation of cyclohexane, platinum or palladium supported on zirconia are selective, recyclable and could behave as truly heterogeneous catalysts. Note de contenu : - EXPERIMENTAL : General - Preparation of catalyst - General procedure for oxidation of cyclohexane - RESULTS AND DISCUSSION : Characterization of catalyst - Oxidationof cyclohexane - Optimal conditions for catalytic activity Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=13310 [article]

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Removal of Brilliant Blue R from Aqueous Solutions on Activated Carbon Produced from Carbonaceous Substrate / S. Alam in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 46, N° 4/2009 (07-8/2009)

[article]  inTENSIDE, SURFACTANTS, DETERGENTS > Vol. 46, N° 4/2009 (07-8/2009) . - p. 205-214 Titre : Removal of Brilliant Blue R from Aqueous Solutions on Activated Carbon Produced from Carbonaceous Substrate Type de document : texte imprimé Auteurs : S. Alam, Auteur ; F. K. Bangash, Auteur ; M. Ahmad, Auteur Année de publication : 2009 Article en page(s) : p. 205-214 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Adsorption Charbon actif Chimie de l'environnement Colorants Solutions aqueuses (chimie) Surfactants Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : Adsorption of brilliant blue R on activated carbon produced from the wood of Paulownia Tomentosa was investigated. Samples characterization by XRD, SEM, EDS and FTIR showed that the oxygen containing surface functional groups (carboxyls, lactones or phenols and ethers) were present on the surface which were eliminated at 800°C. Activation at 800°C, resulted in the opening of porous structure thereby increasing the adsorption capacity. Relatively high amounts of carbon with respect to oxygen were found in the samples with the rise in activation temperature. The adsorption kinetic at 10 and 45°C showed that the first order, Bangham and parabolic diffusion models are applied to the data. The rate constant increased with the rise in temperature of adsorption/activation. Thermodynamic properties ((delta)E=/, (delta)H=/, (delta)S=/ and (delta)Go) for the adsorption process were calculated. Positive values of (delta)H=/ showed that the adsorption of brilliant blue R is endothermic. Negative values of (delta)S=/ reflected the decrease in the disorder of the system at the solid-solution interface during adsorption. The Gibbs free energy, which is the driving force for adsorption is negative indicating spontaneous adsorption. Freundlich and Langmuir models described the equilibrium adsorption data and Thomas model was used for the column study. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=6053 [article]

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Removal of triphenylmethane dye from aqueous solution by carbonaceous adsorbent / S. Alam in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 48, N° 2/2011 (03-04/2011)

[article]  inTENSIDE, SURFACTANTS, DETERGENTS > Vol. 48, N° 2/2011 (03-04/2011) . - p. 134-142 Titre : Removal of triphenylmethane dye from aqueous solution by carbonaceous adsorbent Type de document : texte imprimé Auteurs : S. Alam, Auteur ; M. Mabood, Auteur ; M. Sadiq, Auteur ; Noor-ul-Amin, Auteur ; F. K. Bangash, Auteur Année de publication : 2011 Article en page(s) : p. 134-142 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Adsorption Charbon actif Cinétique chimique Triphénylméthane Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : Removal of acid blue 1 from aqueous solution on activated carbon produced from Salvadora oleoides was investigated. The samples were characterized by BET surface area, BJH pore volume and pore diameter, XRD, SEM, EDS and FTIR analysis. The surfaces contain functional groups like ketones and hydroxyl which disappeared at high activation temperature; relatively high amount of carbon w. r. t. oxygen was found with the increase in activation temperature; the increase in surface area and development of porous structures showed a positive effect on the adsorption capacity. Adsorption of the dye on carbon at 10 and 45°C showed that the first order, Bangham and Elovich and parabolic diffusion equations apply to the kinetic data. The adsorption rate increased with the temperature and with thermal activation of the sample. Thermodynamic parameters like ΔE≠, ΔH≠, ΔS≠ and ΔG≠ were calculated from the kinetic data. The negative values of ΔS≠ reflect decrease in the disorder of the system at the solid-solution interface during adsorption. Gibbs free energy (ΔG≠), which represents the driving force for the affinity of dye for the carbon, increased with the increase in activation temperature. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11122 [article]

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