2012•Acta Scientiae CircumstantiaeRequires access

Study on the adsoption kinetics and thermodynamics of DMF on macroporous adsorbents

Jie Fu, Yanhu Li, Changshen Ye, Cheng Lin

Abstract

The adsorption thermodynamics and kinetics of DMF on macroporous resin NKA-Ⅱ were investigated.The macroporous resin NKA-II has better adsorption and regeneration performance for DMF.Series of adsorption equilibrium experiments were conducted in temperature of 298 K,308 K and 318 K.The adsorption equilibrium data were fitted to Langmuir and Freundlich isotherm equations.The results showed that the adsorption equilibrium data were agreed with Freundlich isotherm well.Thermodynamic analysis suggested ΔH0,ΔG0 and ΔS0.The adsorption of DMF on NKA-Ⅱ was a spontaneous physical adsorption process,and ΔH of adsorption was so small that the temperature had little influence on adsorption process.The kinetics data were fitted to first order model,pseudo-second order model and second order model respectively.The adsorption process of DMF on macroporous resin NKA-II could be described well by pseudo-second order model.

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Key concepts: Adsorption, Freundlich equation, Thermodynamics, Kinetics, Chemistry, Langmuir, Langmuir adsorption model, Chromatography