Abstract
In the work, the magnetite decorated multi-walled carbon nanotubes (Fe3O4/MWCNTs) were employed to simultaneously adsorb methylene blue (MB) and methyl orange (MO) dyes from aqueous media. The experiments were conducted based on a Box-Behnken design (BBD) with the variables of Fe3O4/MWCNTs dosage (0.8–2.0 g), pH (3–9), contact time (30–50 min) and ionic strength (0.02–0.10 mol L–1) using fixed concentrations of the dyes (10 mg L–1). The measured process efficiencies were fitted to the second-order response surface models (R2 > 0.97) by which the optimum conditions for simultaneous adsorption of the dyes was predicted as: 2.0 g L–1 of nanoadsorbent, contact time of 48.5 min, pH 5 and ionic strength of 0.02 mol L–1. The experiments conducted at the conditions resulted in the removal percentages of 98.90 ± 0.29 for MB and 96.64 ± 0.22 for MO. Analysis of variance showed that the nanoadsorbent dosage was the most important factor affecting the removal process. The dye-nanoadsorbent systems followed the pseudo-second order kinetic model (R2 > 0.99). Moreover, Langmuir and Temkin isotherms were found to be the best models to describe MB and MO adsorption onto Fe3O4/MWCNT nanoadsorbent, respectively.
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Yousefi, A.T., Safa, F. Simultaneous Adsorption of Toxic Dyes onto the Magnetite Decorated Multi-Walled Carbon Nanotubes: Statistical Optimization, Kinetics and Isotherms. Moscow Univ. Chem. Bull. 76, 422–434 (2021). https://doi.org/10.3103/S0027131421060122
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DOI: https://doi.org/10.3103/S0027131421060122