2010•China's Manganese IndustryRequires access

Study on Adsorption Kinetics and Thermodynamics of Mn~(2+) on Ion-Exchange Resin

Wei Jian

Abstract

The adsorption process of Mn2+ on D113 resin has been investigated by the method of static adsorption.The results show that,within the experiment range of the manganese concentration,the adsorption of Mn2+ on D113 resin agrees well with the Langmuir and the Freundlich isothermal adsorption equation.TheLangmuir gives the better-fit to the experiment data.Moreover,the adsorption reaction is exothermic process as ΔH0,so the temperature decrease is conducive to adsorption.ΔS0 indicates that the process is entropy decreasing and ΔG0 indicates that it is spontaneous.The adsorption kinetic data well fit the HO pseudo-second-order rate equation.The apparent activation energy is 35.085 kJ·mol-1.The adsorption was controlled by pore diffusion.

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Key concepts: Adsorption, Freundlich equation, Isothermal process, Thermodynamics, Exothermic reaction, Langmuir, Activation energy, Chemistry