CAFFEINE ADSORPTION FROM AQUEOUS-SOLUTIONS ONTO POLYMERIC SORBENTS - THE EFFECT OF SURFACE-CHEMISTRY ON THE ADSORPTIVE AFFINITY AND ADSORPTION ENTHALPY

被引：32

作者：

MAITY, N

PAYNE, GF

ERNEST, MV

ALBRIGHT, RL

机构：

[1] UNIV MARYLAND,CTR AGR BIOTECHNOL,CATONSVILLE,MD 21228

[2] ROHM & HAAS CO,SPRING HOUSE,PA 19477

来源：

REACTIVE POLYMERS | 1992年 / 17卷 / 03期

基金：

美国国家科学基金会;

关键词：

ADSORPTION; CAFFEINE; CHARGE TRANSFER; PI INTERACTIONS; ENTHALPY;

D O I：

10.1016/0923-1137(92)90274-6

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

Measurements of the adsorption equilibria and the adsorption enthalpies are used to characterize the thermodynamics of caffeine adsorption from aqueous solutions onto three polymeric sorbents which vary in their ability to donate pi-electrons for adsorptive interactions. Measured adsorption enthalpies, by both the temperature dependence of the adsorption affinities and calorimetric methods, are in qualitative agreement and demonstrate that the sorbents with the highest adsorption affinity for caffeine also display the largest adsorption enthalpy. These observations support the contention that caffeine adsorption is driven predominantly by specific enthalpic interactions of the solute with the delocalized pi-electrons on the surface of the sorbents.

引用

页码：273 / 287

页数：15

共 34 条

[31] THE SOLUBILIZATION OF POLYCYCLIC AROMATIC HYDROCARBONS BY PURINES [J].