Adsorption kinetics, equilibrium, and thermodynamic studies to understand adsorption behavior of Evans blue dye by durian husk

• Published in: The Korean journal of chemical engineering Vol. 40; no. 6; pp. 1440 - 1456
• Main Authors: Basirun, Ain Aqilah, Othman, Ahmad Razi, Yasid, Nur Adeela, Halmi, Mohd Izuan Effendi, Gunasekaran, Baskaran, Shukor, Mohd Yunus Abd
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.06.2023; Springer Nature B.V; 한국화학공학회
• Subjects: Adsorption; Biotechnology; Catalysis; Chemistry; Chemistry and Materials Science; Contaminants; Dyes; Enthalpy; Gibbs free energy; Industrial Chemistry/Chemical Engineering; Industrial wastes; Ion exchange; Materials Science; Separation Technology; Thermodynamic equilibrium; Thermodynamics; Wastewater treatment; 화학공학; Thermodynamics; Biosorption; Durian Husk; Non-linear Regression; Evans Blue Dye
• ISSN: 0256-1115; 1975-7220
• DOI: 10.1007/s11814-023-1434-y

Membrane isolation, ion exchange, precipitation, transformation, and biosorption are all viable methods for pollutant removal. Adsorption is a common commercial method to concentrate precious molecules or eliminate contaminants, and it is a cost-effective method of treating industrial wastewater. A novel method for increasing their removal effectiveness has been developed for this purpose, using a low-cost biosorbent made from durian husk and Evans blue (EB) dye as a subject. The EB dye adsorption percentage was determined to be 95.95% with 72.0 mg/g adsorption amount at optimal conditions of pH 2 and 40 °C. The second-order kinetic model fit the experimental data the best. Additionally, the results indicated that the Sips isotherm model fits the experimental data better and that the experiment involved single-layer adsorption on the adsorbent surface. A non-linear regression of the van’t Hoff plot gave negative values of Gibbs free energy (−39.38 to −41.48 kJ/mol) at all the temperatures studied (from 20 to 60 °C), indicating that the adsorption process is spontaneous and feasible. A negative value for the enthalpy (ΔH o =−23.37kJ/mol) indicated that the adsorption was exothermic, and the positive value of (ΔS o =54.55kJ/mol·K) concludes the nature of adsorption of Evans blue dye by Durian husk likely to follow a physisorption adsorption mechanism.