KINETICS AND THERMODYNAMICS STUDY OF THE COLUMN ADSORPTION OF METHYLENE BLUE ONTO GYPSUM-SILICA COMPOSITE
Abstract
This study investigates the efficiency of a gypsum-silica composite as an adsorbent for the removal of methylene blue (MB) dye from aqueous solutions through a fixed-bed column adsorption process. The composite material was synthesized, characterized, and employed in continuous flow experiments to evaluate its adsorption capacity and performance. Key operational parameters such as influent dye concentration, flow rate, and bed height were systematically varied to study their effects on the breakthrough curves and adsorption behavior.
For Kinetic studies The negative R² further indicates an extremely poor correlation between the experimental data and the Freundlich model. Therefore, it is concluded that the adsorption of methylene blue onto the gypsum–silica composite does not follow the Freundlich isotherm, and alternative models should be considered for better data fitting.
Thermodynamic analyses further indicated that the adsorption was exothermic, with negative entropy changes highlighting a decrease in randomness at the adsorbent-adsorbate interface during adsorption.
Overall, the results demonstrate that the gypsum-silica composite is a promising, cost-effective, and eco-friendly material for the efficient removal of methylene blue dye from wastewater, with favorable kinetic and thermodynamic properties that support its practical application in environmental remediation
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