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.

Key words: polymeric adsorbents with amide groups；adsorption, tea Polyphenols（TP）, thermodynamics