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Experimental and theoretical study of methylene blue adsorption on a new raw material, Cynara scolymus - A statistical physics assessment

Lookup NU author(s): Dr Jie ZhangORCiD



This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).


Methylene blue (MB) adsorption was performed on a natural material powder of Cynarascolymus as a new inexpensive adsorbent identified by Cs. To analyze the Cs material, FTIR, SEM,isoelectric point (pHpzc) analysis, TGA, and DRX were used. The maximum experimental adsorptioncapacity of the Cs material was 203.333, 192.187, and 179.380 mg.g-1 at 298, 303, and 313 K, respectively.The correlation coefficients (R2) and average percentage errors APE (%) values for the kineticand isotherms models indicated that the adsorption kinetics followed a pseudo-nth order model andthat the traditional isotherm model Redlich–Peterson (R–P) correctly described the experimental dataobtained at 298, 303, and 313 K, respectively. The steric, energetic, and thermodynamic characteristicsof the most relevant advanced model (double-energy single-layer model (AM 2)) were analyzedin detail. The number of active sites for the first receptors (n1) was determined to be 0.129, 0.610,and 6.833, whereas the number of second active sites (n2) was determined to be 1.444, 1.675, and2.036 at 298, 303, and 313 K, respectively. This indicated the presence of both multi–docking andmultimolecular modes for the first style of MB ions (n1), while only a multimolecular mode for thesecond style of MB ions (n2). Thermodynamic characteristics demonstrated that MB adsorption ontothe Cs adsorbent is spontaneous and feasible.

Publication metadata

Author(s): Djama C, Bouguettoucha A, Chebli D, Amrane A, Tahraoui H, Zhang J, Mouni L

Publication type: Article

Publication status: Published

Journal: Sustainability

Year: 2023

Volume: 15

Online publication date: 30/06/2023

Acceptance date: 26/06/2023

Date deposited: 18/07/2023

ISSN (electronic): 2071-1050

Publisher: MDPI


DOI: 10.3390/su151310364


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