摘要
采用反相悬浮聚合技术,合成了茶碱模板酚醛吸附树脂和非模板酚醛吸附树脂,比较了两种树脂对茶碱的吸附状况.结果表明,对茶碱的吸附数据符合Langmuir方程,吸附属于单分子层吸附.在一定浓度范围内的吸附数据符合Freundlich方程,表明吸附是优惠吸附.Scatchard分析表明茶碱模板酚醛树脂具有特定的高亲和性吸附位点,其离解常数和最大吸附量为Kd1=0.129 mmol/L,Qmax1=138μmol/g,低亲和性吸附位点的离解常数和最大吸附量为Kd2=0.433 mmol/L,Qmax2=184μmol/g.在吸附的初始阶段,吸附速率数据与半经验吸附速率方程很吻合,证实吸附茶碱是粒扩散控制过程.在动态条件下,浓度为2.00 mmol/L的茶碱溶液以3 BV/h的流速流经茶碱模板酚醛吸附树脂床时,在第24 BV出现穿透;用1 mol/L的盐酸以1.5 BV/h的流速进行洗脱,在4BV的洗脱率达到97.2%,说明该树脂具有良好的洗脱性能.
By the technology of inverse suspension polymerization,theophylline template phenolic resin sorbent（TTPS） and non-template phenolic resin sorbent（NTPS） have been synthesized.Comparison of theophylline adsorption on TTPS and NTPS was made.The experimental results showed that the adsorption data fitted the Langmuir model,which implied the monomolecular layer sorption in these systems.Theophylline adsorption data matched Freundilich equation within the low concentration range,which meant the adsorption was preferential.By Scatchard analysisi,t was found that TTPS showed specific binding sites.The dissociation constants and the maximum binding capacity were calculated to be Kd1 = 0.129 mmol /L and Qmax1 = 138 μmol/g for high affinity binding sites and Kd2 = 0.433 mmol/L and Qmax2 = 184 μmol/g for lower affinity binding sitesr,espectively.Moreoveri,t was found that the sorption rate data of theophylline adequately fitted a semi-empirical rate equationn in initial period.It confirmed the particle-diffusion control mechanism of the sorption process.When 2.00 mmol /L solution of theophylline at the rate of 3 BV /h flowed through TTPS columns,breakthrough point was 24th bed volume under dynamic condition.It was clear that with 1 mol /L hydrochloric acid at the rate of desorption 1.5 BV /h the removing of 97.2% of all the theophylline adsorbed on TTPS was observed at 4 bed volumes.The result showed that TTPS possessed excellent desorption performance.
出处
《高分子学报》
SCIE
CAS
CSCD
北大核心
2011年第4期340-346,共7页
Acta Polymerica Sinica
基金
辽宁省自然科学基金(基金号20082049)资助项目
关键词
分子印迹
茶碱
酚醛吸附树脂
反相悬浮聚合
吸附
Molecularly imprinting
Theophylline
Phenolic resin sorbent
Inverse suspension polymerization
Adsorption
