Copper ions biosorption onto bean shells: kinetics, equilibrium, and process optimization studies
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Date
2023
Authors
Marković, Miljan
Gorgievski, Milan
Štrbac, Nada
Božinović, Kristina
Grekulović, Vesna
Mitovski, Aleksandra
Zdravković, Milica
Journal Title
Journal ISSN
Volume Title
Publisher
Serbian Chemical Society
Source
Journal of the Serbian Chemical Society
Volume
88
Issue
9
Abstract
The removal of copper ions from aqueous solutions using bean shells as an adsorbent is presented in this paper. The influence of the solution pH on the biosorption capacity was investigated. The biosorption capacity increased with the increase in the solution pH. The pseudo-second order kinetic model showed the best agreement with the analysed experimental data, indicating that chemisorption could be a possible way of binding the copper ions to the surface of the bean shells. The Langmuir isotherm model best fitted the analysed isotherm data. The SEM-EDS analysis was performed before and after the biosorption process. The change in the morphology of the sample after the biosorption process was evident, whereby K, Mg, Si and Ca were possibly exchanged with copper ions. Response surface methodology (RSM) based on the Box–Behnken design (BBD) was used to optimize the biosorption process, with the selected factors: the solution pH, initial copper ions concentration and contact time. The optimum biosorption conditions were determined to be: pH 3–4, initial copper ions concentration, 100 mg dm-3, and contact time, 10–30 min.
Description
Keywords
biosorption, copper ions, bean shells, kinetics, Box–Behnken design
Citation
DOI
10.2298/JSC221018014M
Scopus
ISSN
0352-5139
1820-7421
1820-7421
ISBN
License
CC-BY