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Title: Adsorption of cationic and anionic dyes onto coffee grounds cellulose/sodium alginate double-network hydrogel beads: Isotherm analysis and recyclability performance
Authors: Kasbaji, Meriem
Mennani, Mehdi
Grimi, Nabil
Oubenali, Mustapha
Mbarki, Mohamed
Zakhem, Henri El 
Moubarik, Amine
Affiliations: Department of Chemical Engineering 
Keywords: Adsorption
Composite hydrogels beads
Congo red
Methylene blue
Sodium alginate
Issue Date: 2023-06-01
Publisher: Elsevier
Part of: International Journal of Biological Macromolecules
Volume: 239
This work describes the preparation of new eco-friendly adsorbents with a simple method. Gel beads of coffee grounds cellulose (CGC) and sodium alginate (SA) were prepared for wastewater treatment. Upon their synthesis, the physicochemical properties, performances and efficiency were analyzed by means of various structural and morphological characterizations. Kinetic and thermodynamic adsorption approaches evaluated the removal capacity of these beads which reached equilibrium in 20 min for Methylene Blue (MB) and Congo Red (CR). Also, the kinetics shows that the results can be explained by the pseudo-second-order model (PSO). Furthermore, the isotherm assessments showed that Langmuir-Freundlich can fit the adsorption data of both contaminants. Accordingly, the maximum adsorption capacities reached by the Langmuir-Freundlich model are 400.50 and 411.45 mg/g for MB and CR, respectively. It is interesting to note that the bio-adsorption capabilities of MB and CR on bead hydrogels decreased with temperature. Besides, the results of the thermodynamic study evidenced that the bio-adsorption processes are favorable, spontaneous and exothermic. The CGC/SA gel beads are therefore outstanding bio-adsorbents, offering a great adsorptive performance and regenerative abilities.
ISSN: 01418130
DOI: 10.1016/j.ijbiomac.2023.124288
Ezproxy URL: Link to full text
Type: Journal Article
Appears in Collections:Department of Chemical Engineering

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