摘要
采用静态吸附法研究了自制咖啡因印迹酚醛吸附树脂(CIPS)和非印迹酚醛吸附树脂(NIPS)对咖啡因的吸附。结果表明,在一定的温度和浓度范围内CIPS和NIPS对咖啡因的吸附数据符合Freundlich方程,说明吸附为优惠吸附;对吸附数据进行数学处理,求得了咖啡因在CIPS和NIPS上的吸附焓变在-19 kJ/mol--31 kJ/mol范围,表明咖啡因与酚羟基的作用力为氢键作用,吸附是放热过程;求得的自由能变和熵变为负值,说明吸附过程是自发进行的。
By static adsorption experiment, the adsorption state of caffeine on caffeine imprinted phenolic resin sorbent（CIPS） and non-imprinted phenolic resin sorbent （NIPS） were compared. The results adsorption datas are consistent with Freundlich equation in a certain range of concentration, so the show that the adsorptions of caffeine on CIPS and NIPS are preferential adsorption. The isosteric adsorption enthalpy is within -19 k J/tool -31 kJ/mol, which suggests that the force of recognition point between the caffeine and phenolic hydroxyl group is a hydrogen bonding force and the adsorption is an exothermic process. The adsorption free energy change and adsorption entropy change are all negative, which indicates that the occurrence of adsorption is spontaneous.
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2013年第5期113-116,共4页
Polymer Materials Science & Engineering
基金
辽宁大学创新人才培养基金资助
关键词
分子印迹聚合物
酚醛吸附树脂
咖啡因
吸附
热力学
molecularly imprinted polymers
phenolic resin
caffeine
adsorption
thermodynamics
