A mass transfer model for the fixed-bed adsorption of ferulic acid onto a polymeric resin: axial dispersion and intraparticle diffusion

Environmental Technology
Nancy E Davila-GuzmanRefugio B García-Reyes

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.

References

Mar 8, 2006·Journal of Hazardous Materials·P LodeiroM E Sastre de Vicente
Aug 21, 2007·Journal of Hazardous Materials·Carlos Eduardo BorbaReginaldo Guirardello
Aug 19, 2008·Journal of Agricultural and Food Chemistry·Ashwini TilayUday Annapure
Jan 26, 2010·Journal of Hazardous Materials·Khim Hoong Chu

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Citations

Jan 21, 2020·ACS Omega·Nancy E Dávila-GuzmánEugenio Hernández-Fernández

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Methods Mentioned

BETA
column adsorption

Software Mentioned

RSSCT
Matlab®

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