Equilibria for adsorption of organic compounds on activated carbons in aqueous solutions st0]II. generalization and a prediction method of adsorption isotherms

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Abstract Adsorption isotherms for various systems for organic compounds and activated carbons are generalized as the following equation by the introduction of limiting value for volumetric adsorbed amount W 0 , affinity coefficient γ, and correction factor b for molar volume of adsorbate in pores of activated carbon: Q = ( W 0 bV )( C C S ) 1 γn S . Here, Q is the equilibrium molar adsorbed amount, C and C S are the equilibrium and the saturated concentrations, V is the molar volume of adsorbate, 1 n S is the exponential parameter of the modified Freundlich equation for a standard adsorbate, and the values of b can be approximated by 1.0 for liquid adsorbates and by 1.5 for solid benzene substitutes. Furthermore, it is found that, except for phenols, the values of W 0 , n S , and γ can be calculated from only the properties of activated carbon and adsorbate by the following equations.

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