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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
Zakhem, Henri El
|Affiliations:||Department of Chemical Engineering||Keywords:||Adsorption
Composite hydrogels beads
|Issue Date:||2023-06-01||Publisher:||Elsevier||Part of:||International Journal of Biological Macromolecules||Volume:||239||Abstract:||
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.
|URI:||https://scholarhub.balamand.edu.lb/handle/uob/6783||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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