Equilibrium, Thermodynamics and Kinetic Studies on the Adsorption of Aniline by Wheat Straw
The equilibrium, thermodynamics and kinetic studies on the adsorption of aniline by wheat straw were evaluated. The isotherm parameters were estimated by non - linear regression analysis. The equilibrium process was described well by the Freundlich isotherm modeL The maximum wheat straw sorption capacity was found to be 6. Omg'g -1 at 323 K. The results of thermodynamics showed that the isosteric adsorption enthalpy change ( △H ) is in the range of 13. 58 - 22. 34 kj'mol-1 when the isosteric adsorption capacity is increased from 0. 2 to 2. 5mg-g-1, and Gibbs free energy change (AC) is negative while entropy change ( AS) is positive. The kinetics of aniline adsorption on wheat straw followed the Lagergren' s pseudo - second - order model well and the overall rate of aniline uptake was found to be controlled by boundary - layer diffusion at the beginning of adsorption, while pore diffusion controlled the overall rate of adsorption at a later stage.
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万方数据
维普
