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Synthesis, characterization, and adsorption properties of Fe/Cr-pillared bentonites / Fatma Tomul in Industrial & engineering chemistry research, Vol. 50 N° 12 (Juin 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 12 (Juin 2011) . - pp. 7228-7240 Titre : Synthesis, characterization, and adsorption properties of Fe/Cr-pillared bentonites Type de document : texte imprimé Auteurs : Fatma Tomul, Auteur Année de publication : 2011 Article en page(s) : pp. 7228-7240 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Adsorption Résumé : Bentonites pillared with iron, iron/chromium with different Fe/Cr molar ratios, and chromium were synthesized and tested as adsorbents of cadmium. The pillared bentonites were characterized by using scanning electron microscopy with energy dispersive system (SEM-EDS), powder X-ray diffraction (XRD), N2-adsorption/desorption, and Fourier-transformed infrared spectroscopy (FTIR). The thermal stability of the samples was studied with thermogravimetry (TG). Adsorption experiments were conducted by varying pH, contact time, and temperature. The content of the pillaring solution was the most important parameter that influenced the physicochemical, textural, and acidic properties of the pillared bentonites. The results revealed that the adsorption capacity of the materials increased with an increase in pH and contact time. The results also indicated that the equilibrium adsorption data of Cd2+ onto Cr-pillared bentonite best fit the Redlich―Peterson model, whereas adsorption onto Fe-pillared bentonite and Fe/Cr-pillared bentonite with Fe/Cr molar ratio of 5:5 correlated with the first-order model. Adsorption kinetics results showed that the adsorption followed the pseudo-second-order kinetic model. Thermodynamic studies suggested that the adsorption of Cd2+ onto Fe-pillared bentonite was an endothermic and spontaneous process. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24239037 [article] Synthesis, characterization, and adsorption properties of Fe/Cr-pillared bentonites [texte imprimé] / Fatma Tomul, Auteur . - 2011 . - pp. 7228-7240. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 12 (Juin 2011) . - pp. 7228-7240 Mots-clés : Adsorption Résumé : Bentonites pillared with iron, iron/chromium with different Fe/Cr molar ratios, and chromium were synthesized and tested as adsorbents of cadmium. The pillared bentonites were characterized by using scanning electron microscopy with energy dispersive system (SEM-EDS), powder X-ray diffraction (XRD), N2-adsorption/desorption, and Fourier-transformed infrared spectroscopy (FTIR). The thermal stability of the samples was studied with thermogravimetry (TG). Adsorption experiments were conducted by varying pH, contact time, and temperature. The content of the pillaring solution was the most important parameter that influenced the physicochemical, textural, and acidic properties of the pillared bentonites. The results revealed that the adsorption capacity of the materials increased with an increase in pH and contact time. The results also indicated that the equilibrium adsorption data of Cd2+ onto Cr-pillared bentonite best fit the Redlich―Peterson model, whereas adsorption onto Fe-pillared bentonite and Fe/Cr-pillared bentonite with Fe/Cr molar ratio of 5:5 correlated with the first-order model. Adsorption kinetics results showed that the adsorption followed the pseudo-second-order kinetic model. Thermodynamic studies suggested that the adsorption of Cd2+ onto Fe-pillared bentonite was an endothermic and spontaneous process. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24239037