Fixed-Bed Adsorption of Lead from Aqueous Solution Using Chitosan-Coated Bentonite

Cybelle Morales Futalan and Meng-Wei Wan
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Cybelle Morales Futalan: Department of Community and Environmental Resource Planning, University of the Philippines, Los Banos 4031, Philippines
Meng-Wei Wan: Department of Environmental Engineering and Science, Chia Nan University of Pharmacy and Science, Tainan 71710, Taiwan

IJERPH, 2022, vol. 19, issue 5, 1-14

Abstract: In this study, fixed-bed adsorption of Pb(II) from an aqueous solution using chitosan-coated bentonite (CCB) was investigated. Characterization of CCB was performed using Fourier transform infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM). The effects of varying bed height (1.3 to 4.3 cm), flow rate (0.20 to 0.60 mL/min), and initial concentration (500 to 1500 mg/L) on the length of mass transfer zone ( Z m ) and adsorption capacity at breakthrough ( q b ) and exhaustion ( q e ) were examined. Low flow rate and high bed height were determined to cause a longer time to reach breakthrough and exhaustion. Meanwhile, the fixed-bed system was observed to quickly attain breakthrough and exhaustion under high initial concentrations. Kinetic column models such as the Thomas, Yoon–Nelson, and Clark models were used to predict the breakthrough curves. High R 2 values (0.9758 ≤ R 2 ≤ 0.8087) were attained for the Thomas model, which indicates that there is good agreement between experimental data and linear plots generated by the Thomas model. Moreover, the Thomas model is best in describing the breakthrough curves of Pb(II) removal under a fixed-bed system.

Keywords: adsorption; bentonite; breakthrough curve; Clark model; chitosan; fixed-bed; lead; Thomas model (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2022
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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