Adsorption of levulinic acid from aqueous solution by Amberlite XAD-4
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Tarih
2017
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Elsevier Science Bv
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
Levulinic acid (LA) from aqueous solutions was removed by using commercial adsorbent Amberlite XAD-4 (XAD-4). The equilibrium and kinetic studies were performed to investigate the effect of adsorbent amount (1 g to 3.5 g at 298 K, 308 K and 318 K), initial acid concentration (2 g.L-1 to 4 g.L-1 at 298 K, 308 K and 318 K), and contact time (t, 10 min to 90 min at 298 K) on the capability of XAD-4. The uptake capability and removal efficiency of XAD-4 for the adsorption of LA was observed to increase by increasing amount of adsorbent. In the equilibrium experiments of LA adsorption, adsorption capacity value was increased to 26.85 mg.g(-1) from 10 mg.g(-1) at 298 K with an increase in the amount of XAD-4. In the kinetic studies, the equilibrium time of 70 min was obtained. Also equilibrium study was performed at three different temperatures, 298, 308 and 318 K. The maximum removal was obtained at 298 K. Thermodynamic model parameters such as Delta G degrees, Delta H degrees and Delta S degrees are estimated at three different LA concentration (2 g.L-1, 3 g.L-1 and 4 g.L-1). Different isotherm and kinetic models were applied to estimate the equilibrium and kinetic parameters. (C) 2017 Elsevier B.V. All rights reserved.
Açıklama
Anahtar Kelimeler
Adsorption; Levulinic acid; Equilibrium; Kinetics; Amberlite XAD-4
Kaynak
Journal of Molecular Liquids
WoS Q Değeri
Q1
Scopus Q Değeri
Q1
Cilt
234
