【摘要】 用大孔交联氯甲基化聚苯乙烯分别与己内酰胺和尿素发生功能基化反应,合成大孔交联聚(N-对乙烯基苄基己内酰胺)和大孔交联聚(N-对乙烯基苄基脲)2种树脂.通过静态吸附试验,测定了这2种酰胺基树脂对水溶液中茶多酚的吸附等温线,发现所有的吸附等温线都符合Freundlich吸附等温方程.结果表明:聚(N-对乙烯基苄基脲)对水溶液中茶多酚的吸附亲和性相对聚(N-对乙烯基苄基己内酰胺)更大.根据热力学函数关系计算等量吸附焓、Gibbs吸附自由能和吸附熵,表明2种酰胺基树脂对水溶液中茶多酚的吸附均为吸热、熵增的物理吸附过程;同时,聚(N-对乙烯基苄基脲)对水溶液中茶多酚的吸附相对聚(N-对乙烯基苄基己内酰胺)有更低的吸附自由能变,较高的吸附焓变和熵变.更多还原

【Abstract】 Two polymeric adsorbents,PSt-CH2-ε-CLt and PSt-CH2-Ur,were synthesized from macroporous crosslinked chloromethylated poly(styrene-co-divinylbenzene).The adsorption isotherms of tea polyphenols onto the two polymeric adsorbents from aqueous solution were measured and correlated to Freundlich adsorption equation.It was shown all of the adsorption isotherms can be fitted to Freundlich adsorption equation well,and PSt-CH2-Ur has larger adsorption affinity than PSt-CH2-ε-CLt.Isosteric adsorption enthalpies,Gibbs free energies and adsorption entropies were calculated,and the results indicated that the adsorption were all spontaneous,absorbing heat and adsorption entropies increasing processes of with physical characters,and the Gibbs free energies PSt-CH2-Ur was more negative than PSt-CH2-ε-CLt,the isosteric adsorption enthalpies and adsorption entrpies of PSt-CH2-Ur were larger than those of PSt-CH2-ε-CLt.更多还原