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Vol. 37 No. 12 (2025): Vol 37 Issue 12, 2025

Copyright (c) 2025 Sara MEFTAH, Fatima Zohra BATANA, Salima MERGHACHE, Lila BOUZINA, Mutlu Sönmez ÇELEBI

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This work is licensed under a Creative Commons Attribution 4.0 International License.

Valorization of Food Waste as an Eco-Friendly Adsorbent for the Removal of Cationic Textile Dye from Aqueous Solutions: Kinetic, Isotherm and Thermodynamic Studies

https://doi.org/10.14233/ajchem.2025.34814
Sara Meftah
Laboratory of Inorganic Chemistry and Environment (LCIE), Department of Chemistry, Faculty of Sciences, University of Tlemcen, P.O. Box 119, Tlemcen 13000, Algeria
https://orcid.org/0009-0007-6311-9550
Fatima Zohra Batana
Laboratory of Physical Chemistry of Materials (LPCM), Department of Process Engineering, Faculty of Technology, University of Laghouat, P.O. Box 37 G, Laghouat, Algeria
https://orcid.org/0000-0003-3809-0710
Salima Merghache
Laboratory of Inorganic Chemistry and Environment (LCIE), Department of Chemistry, Faculty of Sciences, University of Tlemcen, P.O. Box 119, Tlemcen 13000, Algeria; Laboratory of Functional Agrosystems and Technology of Agronomic Sectors, Department of Agronomy, Faculty of Nature and Life Sciences and Earth and Universe Sciences, Tlemcen University, Imama, Tlemcen 13000, Algeria
https://orcid.org/0000-0003-2255-0129
Lila Bouzina
Laboratory of Inorganic Chemistry and Environment (LCIE), Department of Chemistry, Faculty of Sciences, University of Tlemcen, P.O. Box 119, Tlemcen 13000, Algeria
https://orcid.org/0009-0006-3186-7258
Mutlu Sönmez Çelebi
Department of Chemistry, Faculty of Science and Arts, University of Ordu, 52200, Ordu, Turkey
https://orcid.org/0000-0002-8816-6763

Corresponding Author(s) : Salima Merghache

salima.merghache@univ-tlemcen.dz

Asian Journal of Chemistry, Vol. 37 No. 12 (2025): Vol 37 Issue 12, 2025

Abstract

In this study, Helix aspersa snail shells, a type of food waste and an effective adsorbent, were used to remove methyl violet 2B, a cationic dye commonly found in textile industry wastewater. This adsorbent is cost-effective, environmentally friendly, widely available and highly efficient. The characterization of the material was carried out using several techniques including SEM/EDX, XRD, TGA/DTA and FTIR, to provide a comprehensive analysis of the material’s properties. SEM/EDX analysis showed a heterogeneous morphology of this adsorbent, while XRD confirmed that the main component was CaCO3. After optimizing operational parameters, the highest removal efficiency (93.6%) was achieved at an initial dye concentration of 10 ppm, with particle size less than 0.1 mm, an adsorbent mass of 1.5 g, pH 8, an agitation speed of 700 rpm at a temperature of 20 ºC. The results showed a decrease in removal efficiency with increased ionic strength, with efficiency dropping to 49.5% at NaCl 1 M. The kinetic studies suggested that the adsorption followed a pseudo-second-order model. The adsorption isotherms were best described by the Langmuir model, suggesting monolayer adsorption on a surface with identical sites. Thermodynamic analysis revealed that the phenomenon was exothermic and spontaneous indicating that it is a physisorption process.

Keywords

Methyl violet 2B Food waste Snail shell Wastewater Adsorption Kinetic Isotherms Thermodynamic studies
(1)
Meftah, S.; Batana, F. Z.; Merghache, S.; Bouzina, L.; Çelebi, M. S. Valorization of Food Waste As an Eco-Friendly Adsorbent for the Removal of Cationic Textile Dye from Aqueous Solutions: Kinetic, Isotherm and Thermodynamic Studies. ajc 2025, 37, 3147-3157.
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