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An Evaluation for Adsorption Behaviour and Mechanism of Methylene Blue on Peach Seeds: Isotherm, Kinetic and Thermodynamic Studies

An Evaluation for Adsorption Behaviour and Mechanism of Methylene Blue on Peach Seeds: Isotherm, Kinetic and Thermodynamic Studies

Authors

Keywords:

adsorption, isotherm, kinetic, thermodynamic, methylene blue

Abstract

In the present study, adsorbent prepared from peach seed (PSA) was used for the removal of Methylene Blue (MB), widely utilized dye from aqueous solutions. The influence of operational parameters, including initial MB concentration (20–120 mg L⁻¹), temperature (298–323 K), and contact time (10–180 min), was systematically examined. The removal efficiencies at the 40 mg L⁻¹ initial MB concentration were determined to be 63.9 %, 75.6 %, and 81.6 % at the 298 K, 308 K, and 323 K, respectively. The maximum adsorption capacity (qₘ) was achieved at 156.251 mg g⁻¹ at 323 K. Experimental data were evaluated using adsorption isotherm models, kinetic studies, and thermodynamic analyses. Temkin model was provided the best fit to the experimental data among the applied four isotherm models (Langmuir, Freundlich, Dubinin–Radushkevich, and Temkin). Adsorption kinetics were evaluated with three models and adsorption process was followed the PSO kinetic model most accurately, which has the highest R² values. Thermodynamic analysis for adsorption of 120 mg L⁻¹ initial MB concentration at 323 K was revealed negative values for Gibbs free energy (-3483.06 J mol⁻¹), along with positive enthalpy values (22342.73 J mol⁻¹) and entropy (79.95 J mol⁻¹K⁻¹). These results were showed that adsorption process was spontaneous and endothermic in nature and the activation energy was calculated to be 13.97 kJ mol⁻¹. These findings were suggested that prepared PSA adsorbent represents a promising low-cost alternative to conventional adsorbents for effective removal of dye pollutants from wastewater.

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Published

2026-06-05

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Kul, A. R., & Aldemir, A. (2026). An Evaluation for Adsorption Behaviour and Mechanism of Methylene Blue on Peach Seeds: Isotherm, Kinetic and Thermodynamic Studies : An Evaluation for Adsorption Behaviour and Mechanism of Methylene Blue on Peach Seeds: Isotherm, Kinetic and Thermodynamic Studies . Environmental Research and Technology. Retrieved from https://ertjournal.org/index.php/pub/article/view/354

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