Abstract
The cost-effective adsorbent was developed to remove copper ions from an aqueous solution. The carbonized sunflower stem was analyzed by SEM, FTIR, and XRD. A batch mode adsorption kinetics study was conducted and was observed that the adsorption of copper ions onto carbonized sunflower stem followed pseudo-second-order kinetics. The equilibrium time was found to be 160 min. Maximum uptake (90 %) of copper ion was observed at pH 3.0 for 20 mg L-1. The experimental data were also analyzed for Langmuir, Freundlich, Dubinin-Radushkevich, and Temkin isotherms.
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