Mathematical models based on thermodynamic equilibrium and kinetics of an ion Exchange process

Siminiceanu Ilie; Marchitan Natalia; Duka Gh.; Mereuta Aliona

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SIMINICEANU, Ilie, MARCHITAN, Natalia, DUKA, Gh., MEREUTA, Aliona. Mathematical models based on thermodynamic equilibrium and kinetics of an ion Exchange process. In: Revista de Chimie, 2010, vol. 61, pp. 623-626. ISSN 0034-7752.

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Revista de Chimie

Volumul 61 / 2010 / ISSN 0034-7752

Mathematical models based on thermodynamic equilibrium and kinetics of an ion Exchange process

Pag. 623-626

Siminiceanu Ilie¹, Marchitan Natalia², Duka Gh.², Mereuta Aliona²

¹ Gheorghe Asachi Technical University of Iasi,
² Moldova State University

Disponibil în IBN: 18 iunie 2024

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A new adsorbent has been prepared from Amberlite IRA-67 impregnated with the liquid ion- exchanger Amberlite LA-2 dissolved in n- hexane to recover tartaric acid (TA) from aqueous solution. The experiments done on a batch equipment proved the effectiveness of the new material: the separation degree of TA was100% in a contact time less than 30 minutes for the following values of the 6 main factors: solid/ liquid loading > 1 g/L, T= 294 K, initial pH 2.5, initial TA concentration >1 g/L, particle diameter 0.4-1.2 mm, stirring 200 min^-1. The equilibrium q_e- c_e data were better correlated through the Langmuir model (R²= 0.9962) compared to the Freundlich one (R²= 0.8535). The kinetic curves q- τ have been confronted with 4 kinetic models, and the corresponding kinetic constants have been identified. The Final conclusion was that, under the investigated conditions, the slowest step of the process was the intraparticle diffusion.

Cuvinte-cheie
Dumwald- Wagner, Freundlich, Ho-McKay, Kinetic models, Lagergren, Langmuir, Weber-Morris

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