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Adsorption of Cu2+ on amino functionalized silica gel with different loading / Manu V. in Industrial & engineering chemistry research, Vol. 48 N° 19 (Octobre 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 19 (Octobre 2009) . - pp. 8954–8960 Titre : Adsorption of Cu2+ on amino functionalized silica gel with different loading Type de document : texte imprimé Auteurs : Manu V., Auteur ; Haresh M. Mody, Auteur ; Hari C. Bajaj, Auteur Année de publication : 2009 Article en page(s) : pp. 8954–8960 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Silica  gel  Amino  functionalized  silica  gel  Cu2+  Adsorption Résumé : Silica gel (G) and amino functionalized silica gel with three different loading of an aminopropyl group viz. 0.51, 1.01, and 1.45 mmol/g, (GN1, GN2, and GN3) were synthesized, characterized, and used as adsorbents for the adsorption of Cu2+ ions from aqueous solution. The specific surface area, pore volume, and BJH pore size of silica gel decreased with an increase in the loading of aminopropyl groups. Kinetic of adsorption of Cu2+ on GN2 followed pseudosecond order. Adsorption isotherms of Cu2+ on functionalized silica samples were best fit by the Sips model for all the three functionalized silica gels, among the four models used to describe the Cu2+ adsorption isotherms. The monolayer copper adsorption capacity for the gel GN1 (0.515 mmol Cu2+/g) and GN2 (0.55 mmol Cu2+/g) were found to be almost similar even when the loading of the amino group increased from 0.51 to 1.01 mmol/g. The NH2/Cu mole ratio was found to be around 1 and 2 for GN1 and GN2, respectively. In the case of GN3 (1.45 mmol NH2/g), the monolayer capacity was found to be 1.05 mmol Cu2+/g with a NH2/Cu mole ratio of 1.38. This study indicates that the population density of NH2 determines the NH2/Cu2+ ratio at saturation of Cu2+ on the functionalized silica gel and the affinity of the gel for the Cu2+. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900273v [article] Adsorption of Cu2+ on amino functionalized silica gel with different loading [texte imprimé] / Manu V., Auteur ; Haresh M. Mody, Auteur ; Hari C. Bajaj, Auteur . - 2009 . - pp. 8954–8960. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 19 (Octobre 2009) . - pp. 8954–8960 Mots-clés : Silica  gel  Amino  functionalized  silica  gel  Cu2+  Adsorption Résumé : Silica gel (G) and amino functionalized silica gel with three different loading of an aminopropyl group viz. 0.51, 1.01, and 1.45 mmol/g, (GN1, GN2, and GN3) were synthesized, characterized, and used as adsorbents for the adsorption of Cu2+ ions from aqueous solution. The specific surface area, pore volume, and BJH pore size of silica gel decreased with an increase in the loading of aminopropyl groups. Kinetic of adsorption of Cu2+ on GN2 followed pseudosecond order. Adsorption isotherms of Cu2+ on functionalized silica samples were best fit by the Sips model for all the three functionalized silica gels, among the four models used to describe the Cu2+ adsorption isotherms. The monolayer copper adsorption capacity for the gel GN1 (0.515 mmol Cu2+/g) and GN2 (0.55 mmol Cu2+/g) were found to be almost similar even when the loading of the amino group increased from 0.51 to 1.01 mmol/g. The NH2/Cu mole ratio was found to be around 1 and 2 for GN1 and GN2, respectively. In the case of GN3 (1.45 mmol NH2/g), the monolayer capacity was found to be 1.05 mmol Cu2+/g with a NH2/Cu mole ratio of 1.38. This study indicates that the population density of NH2 determines the NH2/Cu2+ ratio at saturation of Cu2+ on the functionalized silica gel and the affinity of the gel for the Cu2+. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900273v

Effect of thermal treatment of silica gels on their amino functionalization and subsequent adsorption properties for Cu2+ from aqueous solution of copper sulfate / Manu V. in Industrial & engineering chemistry research, Vol. 49 N° 17 (Septembre 1, 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 17 (Septembre 1, 2010) . - pp 8184–8191 Titre : Effect of thermal treatment of silica gels on their amino functionalization and subsequent adsorption properties for Cu2+ from aqueous solution of copper sulfate Type de document : texte imprimé Auteurs : Manu V., Auteur ; Haresh M. Mody, Auteur ; Hari C. Bajaj, Auteur Année de publication : 2010 Article en page(s) : pp 8184–8191 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Thermal  treatment  Aqueous  solution. Résumé : Hydrothermally prepared mesoporous silica gel (prepared under acidic condition) was calcined at different temperatures to control concentration of surface hydroxyl groups. These materials were functionalized with 3-aminopropyltrimethoxysilane (APTMS) and used for the adsorption of Cu2+ ions. Adsorption isotherm and adsorption capacity of the amine functionalized materials for Cu2+ were followed by inductively coupled plasma optical emission spectrometry (ICP-OES). The adsorption capacity for functionalized silica gel was correlated with population density of hydroxyl groups and hence amine content in the materials, which was determined by CHN analysis. Nitrogen adsorption/desorption measurements at liquid N2 temperature, Fourier transform infrared spectrometry (FTIR), and 29Si MAS NMR spectra were used to follow the changes in the textural parameters and surface properties of the mesoporous silica gel samples. This study indicates that thermal treatment of silica gel determines the population density of surface hydroxyl groups and hence the NH2 population density after functionalization of the gels, which in turn determines the NH2/Cu2+ ratio at saturation of Cu2+ on the functionalized silica gel. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1007773 [article] Effect of thermal treatment of silica gels on their amino functionalization and subsequent adsorption properties for Cu2+ from aqueous solution of copper sulfate [texte imprimé] / Manu V., Auteur ; Haresh M. Mody, Auteur ; Hari C. Bajaj, Auteur . - 2010 . - pp 8184–8191. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 17 (Septembre 1, 2010) . - pp 8184–8191 Mots-clés : Thermal  treatment  Aqueous  solution. Résumé : Hydrothermally prepared mesoporous silica gel (prepared under acidic condition) was calcined at different temperatures to control concentration of surface hydroxyl groups. These materials were functionalized with 3-aminopropyltrimethoxysilane (APTMS) and used for the adsorption of Cu2+ ions. Adsorption isotherm and adsorption capacity of the amine functionalized materials for Cu2+ were followed by inductively coupled plasma optical emission spectrometry (ICP-OES). The adsorption capacity for functionalized silica gel was correlated with population density of hydroxyl groups and hence amine content in the materials, which was determined by CHN analysis. Nitrogen adsorption/desorption measurements at liquid N2 temperature, Fourier transform infrared spectrometry (FTIR), and 29Si MAS NMR spectra were used to follow the changes in the textural parameters and surface properties of the mesoporous silica gel samples. This study indicates that thermal treatment of silica gel determines the population density of surface hydroxyl groups and hence the NH2 population density after functionalization of the gels, which in turn determines the NH2/Cu2+ ratio at saturation of Cu2+ on the functionalized silica gel. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1007773