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Research Paper | Chemistry | India | Volume 12 Issue 8, August 2023

Thermodynamic, Kinetics and Equilibrium Study of Methylene Blue Adsorption on Red Gram Seed Husk as Bio Adsorbent from Aqueous Solution

Dattatraya Jirekar ^[2] | Pramila Ghumare ^[2]

Abstract: This study investigates the thermodynamic, kinetic and equilibrium properties of methylene blue adsorption onto red gram seed husk (RGSH) as a bio-adsorbent from aqueous solutions. The effects of various parameters such as initial dye concentration, adsorbent dose, contact time and temperature were evaluated to determine the optimal conditions for adsorption. Adsorption kinetics was determined using pseudo-first and pseudo-second order models, and equilibrium data were analyzed using Langmuir and Freundlich isotherm models. The results show that RGSH can effectively remove methylene blue from aqueous solutions with a high adsorption capacity of 357.83 mg/g. The adsorption process was found to follow a pseudo-first-order model and the Langmuir isotherm provided a better fit, suggesting a monolayer adsorption mechanism. Thermodynamic parameters including free energy change (?G?), enthalpy change (?H?) and entropy change (?S?) were determined, indicating that the adsorption process is spontaneous and exothermic in nature. The study concludes that RGSH is a promising low-cost bio-adsorbent for the removal of methylene blue from wastewater.

Keywords: Kinetics, Equilibrium, Thermodynamics, Methylene blue,red gram seed husk, Bio-adsorbent

Edition: Volume 12 Issue 8, August 2023,

Pages: 417 - 423