Adsorption isotherms of high-concentration caffeine on polar macroporous adsorptive resin XDA8 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.%测定了不同温度下极性大孔吸附树脂XDA-8对高浓度咖啡因的吸附等温线,并采用Langmuir吸附等温方程进行了拟合,在此基础上对吸附行为进行了热力学研究.结果表明,Langmuir吸附等温方程对吸附过程拟合程度很高,XDA-8大孔树脂对咖啡因的吸附为单分子层吸附;XDA-8大孔树脂吸附咖啡因是一个放热过程,升高温度使其吸附能力下降;吸附是自发进行的;吸附质分子被吸附后其运动受到限制,且吸附量越大,限制越大.为树脂在工业咖啡因废水处理中的应用提供了理论依据.
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