Absorption Isotherm Analysis

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The adsorption isotherm indicates the sorption molecules extend between the liquid /solid phase the adsorption operation reaches an equilibrium case. The analysis of the isotherm information by fitting them to several isotherm models could be major step to detection the suitable model that may be used for design objectives . Most adsorption isotherms is also classified into six kinds, that are considerably indicated to as the Langmuir , Freundlich , Temkin, Sips, Brunauer-Emmett Teller and Dubinin- Radushkevich classification. In all cases the adsorbed quantity of adsorbate is progressively increases as its concentration is raise , becoming at some point equivalent to a monolayer, then again will increase to a multilayer, that finally combine into a condensed …show more content…

2.2. Adsorption Kietics Much adsorption kinetic models have been approved to characterize the manner of batch biosorption processes in various experimental conditions. Kinetics of adsorption is one of the major characteristics defining the efficiency of adsorption. 2.2.1 Pseudo first order model The Lagergren rate equation can have been the first rate equation for the sorption in liquid /solid systems depending on solid efficiency. The Lagergren rate equation is the most excessively utilized rate equation for sorption of a solute from a liquid solution (Ho and Mckay,2000). Integrating for the initial and final conditions (t = 0 to t = t) and (qt = 0 to qt = qt), equation (5) may be rearranged for linearized data plotting as shown by equation (6): ( ) ( ) (6) Where: qe and qt are uptake at Equilibrium and at time t, respectively (mg/g), K1 is the pseudo first order rate constant (1/min). 2.2.2 Pseudo-Second Order Model The pseudo second-order kinetic model may be represented as

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