Adsorption Study of Glycerol in Biodiesel on the Sulfonated Adsorbent

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• 作者：Bin Chen ; Wusheng Wang ; Xiao Liu ; Weiming Xue ; Xiaoxun Ma ; Guoliang Chen ; Qiushuo Yu ; Rong Li
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2012
• 出版时间：October 3, 2012
• 年：2012
• 卷：51
• 期：39
• 页码：12933-12939
• 全文大小：297K
• 年卷期：v.51,no.39(October 3, 2012)
• ISSN：1520-5045

文摘

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鈥?23 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鈥揜adushkevich (D-R) isotherm model, the model parameter Q_D decreased with increasing temperature, and the mean free energy of sorption (E) was less than 8 kJ mol^鈥?. The results of Q_D and E reflected the exothermic and physical properties of the adsorption process, respectively. The negative values of Gibbs free energy change (螖G₀) and enthalpy change (螖H₀) indicated that the adsorption occurs spontaneously with an exothermic nature, while the positive values of entropy change (螖S₀) suggested the increase in randomness at the solid鈥搇iquid interface during adsorption. The isosteric heat of adsorption (螖H_X) suggested that strong hydrogen bonding between glycerol and the 鈭扴O₃^{鈥?/sup> groups of the sulfonated adsorbent dominated the adsorption process and that there existed adsorbate鈥揳dsorbate mutual attractive interaction. Furthermore, the existence of hydrogen bonding was also confirmed by infrared spectra.}