A cost-effective and environmental-friendly modified blend of wild carob and Cupressus sempervirens with H₃PO₄ (Cupcar-H₃PO₄) was developed for the extraction from aqueous solutions of cationic dye, crystal violet (CV). The capacity of adsorption was estimated to be 117.26mg/g at 25°C with a pH of 6.22. Isotherm data were fitted using four advanced models to gain insights into the mechanism of CV retention on Cupcar-H₃PO₄. The multilayer with saturation model emerged as the most suitable advanced statistical physics model, suggesting that CV was adsorbed at Cupcar-H₃PO₄ biosorbent receptor site with the formation of  layers. According to the values of the captured crystal violet (CV) per site it was concluded that a multi-molecular  process is occurred. This model revealed the potential for a varying quantity of CV molecules to be adsorbed at a specific site, emphasizing their adsorption with two distinct energies. Through thermodynamic examination, it is showed that the process of CV dye adsorption was endothermic and linked to physical forces. This analysis affirmed the possibility and natural occurrence of CV pollutant dye adsorption on the surface of this adsorbent. Finally, a pore size distribution (PSD) of Cupcar-H₃PO₄ is investigated.

crystal violet, adsorption isotherms, statistical physics, Cupcar-H₃PO₄, pore size distribution (PSD).

Received: November 3, 2023; Revised: December 7, 2023; Accepted: December 20, 2023; Published: January 10, 2024

How to cite this article: Salah Knani, Ridha Selmi, Abdellah Bouguettoucha, Nizar Lefi and Waad Albalwi, Gentian violet adsorption onto biosorbent Cupcar: statistical physics modeling and consequent interpretations, JP Journal of Biostatistics 24(1) (2024), 117-140. http://dx.doi.org/10.17654/0973514324009

This Open Access Article is Licensed under Creative Commons Attribution 4.0 International License

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