Abstract
The textile, leather, and dyeing industries, as well as domestic wastewater, are among the most important sources of environmental pollution. In this study, modified multi-walled carbon nanotubes (m‑MWCNTs) powder was applied as an adsorbent in the adsorption process of Acid Orange 7 (AO7) pollutant in aqueous solution. The m-MWCNTs have been characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), and Brunauer–Emmett–Teller (BET) surface area analysis. The creation of functional groups on carbon nanotubes (CNTs) in acidic solution used. The presence of hydroxyl (–OH) and carboxylic (–COOH) functional groups on CNTs was proved using Fourier transform infrared spectroscopy (FT-IR). The influence of operating factors included pH, adsorbent amount and contact time in the process were studied and optimized. The Langmuir and Freundlich isotherms and pseudo first-second orders adsorption kinetics of dye were studied. Also the results showed that the dye adsorption onto m-MWCNTs followed Langmuir isotherm and pseudo-second-order kinetic.
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ACKNOWLEDGMENTS
The author would like to gratefully acknowledge members of the Research Laboratory of Islamic Azad University, Tuyserkan Branch, Tuyserkan, Iran.
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Moradi, R., Mehdizade, S. Adsorption of Acid Orange 7 Dye Pollutant from Aqueous Solutions Using Modified Multi-Walled Carbon Nanotubes. Russ. J. Phys. Chem. 97, 1550–1557 (2023). https://doi.org/10.1134/S0036024423070257
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DOI: https://doi.org/10.1134/S0036024423070257