Adsorption Kinetics and Isotherm Models: A Review

Adsorption Kinetics describes the rate at which solute is adsorbed and resident time of adsorbates on solid-liquid interface. isotherms play important role in determining interaction between adsorbate adsorbent optimum adsorption capacity adsorbent. This article considered selected kinetics models. Pseudo first order, second Elovich, Bhattacharya Venkobachar, Natarajan Khalaf were reviewed assumption that process behaves as heterogeneous reaction equation presented takes form straight line, slopes intercepts plots are used to determine adsorbent, constant, intraparticle diffusion. Value correlation coefficient obtained model best describe process. Langmuir, Freundlich, Radlich-Peterson, Temkin Dubinin-Radushkevic presented. Their provide insight affinity, mean free energy, whether physisorption or chemisorptions, single multilayer. essential information required for understanding process.
 Keywords: Adsorption; kinetics; isotherms; pseudo order; Langmuir