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Thermodynamics Study on Adsorption of High-Concentration Caffeine by Macroporous Resin XDA-8

Xuexi Chen

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Abstract

Adsorption isotherms of high-concentration caffeine on polar macroporous adsorptive resin XDA-8 were determined at different temperature,which was fit by Langmuir isothermal adsorption equation,and then the thermodynamics study on the adsorption behavior was conducted.The results showed that,Langmuir adsorption isothermal equation fitted the adsorption process well and caffeine was adsorbed on single layer of the resin;the process was exothermic,and higher temperature was disadvantage to the adsorption;the adsorption process was spontaneous;the motion of cafein was restricted after adsorption,and the restriction got stronger when the adsorption capacity increased.

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What this paper is about

Adsorption isotherms of high-concentration caffeine on polar macroporous adsorptive resin XDA-8 were determined at different temperature,which was fit by Langmuir isothermal adsorption equation,and then the thermodynamics study on the adsorption behavior was conducted.The results showed that,Langmuir adsorption isothermal equation fitted the adsorption process well and caffeine was adsorbed on single layer of the resin;the process was exothermic,and higher temperature was disadvantage to the adsorption;the adsorption process was spontaneous;the motion of cafein was restricted after adsorption,and the restriction got stronger when the adsorption capacity increased.

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Available abstract

Adsorption isotherms of high-concentration caffeine on polar macroporous adsorptive resin XDA-8 were determined at different temperature,which was fit by Langmuir isothermal adsorption equation,and then the thermodynamics study on the adsorption behavior was conducted.The results showed that,Langmuir adsorption isothermal equation fitted the adsorption process well and caffeine was adsorbed on single layer of the resin;the process was exothermic,and higher temperature was disadvantage to the adsorption;the adsorption process was spontaneous;the motion of cafein was restricted after adsorption,and the restriction got stronger when the adsorption capacity increased.

Key concepts: Adsorption, Chemistry, Isothermal process, Langmuir, Freundlich equation, Exothermic reaction, Langmuir adsorption model, Thermodynamics

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