Abstract
Synthetic dye contamination of waterways poses a serious threat to human health and the environment. Eriochrome Black T (EBT) is a persistent azo dye that is especially dangerous because of its toxicity and chemical stability. This study evaluates cork as a cost-effective and environmentally responsible biosorbent for the removal of EBT from aquatic systems. Experimental observations confirmed that adsorption equilibrium was achieved within 25 minutes at an optimal pH of 4. Kinetic using pseudo-first-order, pseudo-second-order, and Elovich models revealed that the pseudo-second-order model yielded the most accurate fit (k2 = 0.2482 g/mg.min), implying that chemisorption is the primary mechanism controlling the adsorption rate. To interpret the underlying diffusion phenomena, both Weber–Morris and Reichenberg intraparticle diffusion models were utilized, indicating the simultaneous occurrence of surface film diffusion and internal pore transport. The equilibrium adsorption behavior was better captured by the Freundlich isotherm than the Langmuir model, suggesting the presence of multilayer adsorption across a heterogeneous surface. The cork’s adsorption capacity reached a maximum of 42.49 mg/g. Thermodynamic parameters (ΔH° = 13.234 J/mol, ΔG° =-19.06 kJ/mol, ΔS° = 64.02 J/mol.K) indicated that the adsorption is both endothermic and spontaneous. Taken together, these findings affirm cork’s promise as a renewable and cost-efficient adsorbent for addressing EBT pollution in aquatic systems.
First Page
78
Last Page
104
Recommended Citation
Alsolami, M. A. and Saigl, Z. M.
(2026)
"Selective Separation of Eriochrome Black T onto Cork From Marine and Tap Waters: Kinetic, Isotherm and Thermodynamic Study,"
The Journal of King Abdulaziz University: Science: Vol. 36:
Iss.
2, Article 6.
DOI: https://doi.org/10.64064/1658-4252.1030
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