Adsorption study of glycerol in biodiesel on the sulfonated adsorbent / Bin Chen in Industrial & engineering chemistry research, Vol. 51 N° 39 (Octobre 2012)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 51 N° 39 (Octobre 2012) . - pp. 12933-12939 Titre : Adsorption study of glycerol in biodiesel on the sulfonated adsorbent Type de document : texte imprimé Auteurs : Bin Chen, Auteur ; Wusheng Wang, Auteur ; Xiao Liu, Auteur Année de publication : 2012 Article en page(s) : pp. 12933-12939 Note générale : Industrial chemsitry Langues : Anglais (eng) Mots-clés : Adsorption Résumé : The adsorption isotherm data of glycerol from biodiesel (FAME, fatty acid alkyl esters) onto the sulfonated adsorbent were obtained via batch equilibrium tests at different temperatures in the range of 303―323 K. Subsequently, these data were fitted by four isotherm models. Freundlich isotherm model was the best fitted (r2 > 0.98), and the model parameter 1/ n implied that the adsorption process was favorable. For the Dubinin-Radushkevich (D-R) isotherm model, the model parameter QD decreased with increasing temperature, and the mean free energy of sorption (E) was less than 8 kJ mol―1. The results of QD and E reflected the exothermic and physical properties of the adsorption process, respectively. The negative values of Gibbs free energy change (ΔG0) and enthalpy change (ΔH0) indicated that the adsorption occurs spontaneously with an exothermic nature, while the positive values of entropy change (ΔS0) suggested the increase in randomness at the solid-liquid interface during adsorption. The isosteric heat of adsorption (ΔHx) suggested that strong hydrogen bonding between glycerol and the ―SO3― groups of the sulfonated adsorbent dominated the adsorption process and that there existed adsorbate-adsorbate mutual attractive interaction. Furthermore, the existence of hydrogen bonding was also confirmed by infrared spectra. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie301951p [article] Adsorption study of glycerol in biodiesel on the sulfonated adsorbent [texte imprimé] / Bin Chen, Auteur ; Wusheng Wang, Auteur ; Xiao Liu, Auteur . - 2012 . - pp. 12933-12939. Industrial chemsitry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 39 (Octobre 2012) . - pp. 12933-12939 Mots-clés : Adsorption Résumé : The adsorption isotherm data of glycerol from biodiesel (FAME, fatty acid alkyl esters) onto the sulfonated adsorbent were obtained via batch equilibrium tests at different temperatures in the range of 303―323 K. Subsequently, these data were fitted by four isotherm models. Freundlich isotherm model was the best fitted (r2 > 0.98), and the model parameter 1/ n implied that the adsorption process was favorable. For the Dubinin-Radushkevich (D-R) isotherm model, the model parameter QD decreased with increasing temperature, and the mean free energy of sorption (E) was less than 8 kJ mol―1. The results of QD and E reflected the exothermic and physical properties of the adsorption process, respectively. The negative values of Gibbs free energy change (ΔG0) and enthalpy change (ΔH0) indicated that the adsorption occurs spontaneously with an exothermic nature, while the positive values of entropy change (ΔS0) suggested the increase in randomness at the solid-liquid interface during adsorption. The isosteric heat of adsorption (ΔHx) suggested that strong hydrogen bonding between glycerol and the ―SO3― groups of the sulfonated adsorbent dominated the adsorption process and that there existed adsorbate-adsorbate mutual attractive interaction. Furthermore, the existence of hydrogen bonding was also confirmed by infrared spectra. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie301951p

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