title: A mass transfer model for the fixed-bed adsorption of ferulic acid onto a polymeric resin: axial dispersion and intraparticle diffusion.
abstract: In this study, amberlite XAD-16 (XAD-16) bed column system was used to remove ferulic acid (FA) from aqueous solutions. Laboratory-scale column experiments were conducted in downflow fixed bed at initial FA concentration of 1 g/L, initial pH 3, and 25°C. The performance of the adsorbent bed under different flow rates (1.3-7.7 mL/min) was studied. The bed utilization efficiency was in the range of 64.64-72.21% at the studied flow rates. A mass transfer model considering both axial dispersion and intraparticle diffusion was developed to predict the breakthrough curves of FA adsorption on XAD-16. This model predicted the experimental data better than Bohart-Adams model and Thomas model, based on the low deviation between predicted and experimental data. The axial dispersion coefficient value varied from 6.45 × 10(-6) to 1.10 × 10(-6) m(2)/s at flow rate from 1.3 to 7.7 mL/min, whereas the intraparticle diffusion coefficient was 1.04 × 10(-10) m(2)/s, being this last resistance the rate-limiting step. In conclusion, axial dispersion and intraparticle diffusion phenomena play the major role in predicting the adsorption of FA onto XAD-16 in fixed-bed columns.
authors.affiliation: a Facultad de Ciencias Químicas , Universidad Autónoma de Nuevo León, UANL , Nuevo León , México.
authors.forename: Nancy E
authors.initials: NE
authors.lastname: Davila-Guzman
authors.affiliation: a Facultad de Ciencias Químicas , Universidad Autónoma de Nuevo León, UANL , Nuevo León , México.
authors.forename: Felipe J
authors.initials: FJ
authors.lastname: Cerino-Córdova
authors.affiliation: a Facultad de Ciencias Químicas , Universidad Autónoma de Nuevo León, UANL , Nuevo León , México.
authors.forename: Eduardo
authors.initials: E
authors.lastname: Soto-Regalado
authors.affiliation: a Facultad de Ciencias Químicas , Universidad Autónoma de Nuevo León, UANL , Nuevo León , México.
authors.forename: Margarita
authors.initials: M
authors.lastname: Loredo-Cancino
authors.affiliation: a Facultad de Ciencias Químicas , Universidad Autónoma de Nuevo León, UANL , Nuevo León , México.
authors.forename: José A
authors.initials: JA
authors.lastname: Loredo-Medrano
authors.affiliation: a Facultad de Ciencias Químicas , Universidad Autónoma de Nuevo León, UANL , Nuevo León , México.
authors.forename: Refugio B
authors.initials: RB
authors.lastname: García-Reyes
mesh_terms: D000327:Adsorption; D005591:Chemical Fractionation; D003373:Coumaric Acids / Q000737:chemistry* / Q000302:isolation & purification*; D004058:Diffusion; D008962:Models, Theoretical; D011108:Polymers
chemical_list: D003373:Coumaric Acids; D011108:Polymers; C004999:ferulic acid
keywords: Ferulic acid; adsorption; breakthrough-curve; mass transfer; modelling