A novel kinetic model for batch aqueous-solution/porous-solid adsorption systems

Abstract

In this work, a novel kinetic model is introduced to represent the batch adsorption for aqueous-solution/porous-solid systems. The model proposes that the rate of adsorption is controlled by three parameters: solute concentration, n-powered time, and what is called varying-resistance against adsorption. Applicability of the model was examined by investigating the performance of the model considering the batch adsorption of methylene blue from aqueous solution onto three different adsorbents: hybrid resin-gel (MFTAT), commercial exhausted black tea, and dried pea husk. The effect of initial concentration was studied to explore model behavior. According to results and determined data, the DB-model successfully estimated the adsorption capacities and the rate constants. In addition, the DB-model managed to recognize the relative contributions of diffusion in the adsorption processes.

Keywords:

• Adsorption
• Porous
• Kinetic
• Diffusion
• Binding