Abstract
In this study, it was aimed to remove Cu(II) ions from the aqueous solutions by a biopolymer-clay nanocomposite (BCN) adsorbent. For this, the effects of some parameters, such as pH (pH 1–6), contact time (5–1440 min), the amount of adsorbent (0.5–3 g/L) and temperature (25–35 °C) were optimized. It was found that the adsorption became the most efficient by increasing the contact time and 99.74% removal efficiency for Cu(II) was achieved under the optimum conditions (pH 3; contact time 1440 min; adsorbent amount 1 g/L; 25 °C). Moreover, the adsorption data were modelled by Langmuir, Freundlich and Temkin adsorption isotherms and Langmuir adsorption was found to be the most appropriate adsorption isotherm model for Cu(II). The maximum adsorption capacity (qm) of biopolymer-clay nanocomposite adsorbent was found to be 214.28 mg/g for Cu(II). Furthermore, the pseudo-second-order reaction kinetic model was found to be the most suitable kinetic model for Cu(II) adsorption. The desorption efficiency from BCN surface was found to be 99.36% using 2 mol/L HNO3. The results revealed that BCN can be considered as effective, economic, and alternative adsorbent for Cu(II) removal based on the both 99.74% of removal efficiency and 214.28 mg/g of adsorption capacity and all experiments were carried out at least three times with a RSD values of 4%. Based on reusability of the adsorbent, it was seen that there was a slight decrease in the adsorption efficiencies in the third cycle but then adsorption decreased and reached 67% in the fourth cycle.
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Güney, B.C., Arslan, Y. Removal of Cu(II) by biopolymer-clay nanocomposite adsorbent. Reac Kinet Mech Cat 136, 433–448 (2023). https://doi.org/10.1007/s11144-022-02340-5
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DOI: https://doi.org/10.1007/s11144-022-02340-5