Abstract

Rezvan Zeynolabedin¹, Azam Marjani¹, Aref Shokri², Majid Saghi³ and Mohammad Hosein Bigtan⁴  

DOI : http://dx.doi.org/10.13005/ojc/310130

Batch experiments were carried out for the sorption of methylene blue onto elaeagnusan gastifolial particles. The operating variables studied were initial solution pH, contact time, adsorbent dosage and temperature. Equilibrium data were fitted to Freundlich and Langmuir isotherm equation and the equilibrium data were found to well represented by Langmuir isotherm equation. Various thermodynamic parameters such as enthalpy of sorption (∆H°), free energy change (∆G°) and entropy (∆S°) were estimated. The positive value of ∆H° and negative value of ∆G° shows the sorption process is endothermic and spontaneous. The positive value of entropy ∆S° shows the increased randomness at the solid–liquid interface during the sorption of dye ions onto elaeagnusan gastifolial particles.

Methylene blue; Separation; Simulation; Thermodynamic parameters

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