合成了咖啡因印迹酚醛吸附树脂,采用静态和动态吸附法考察了分子识别特性。Scatchard分析表明,咖啡因印迹酚醛吸附树脂具有特定的高亲和性结合位点,其离解常数和最大吸附量为Kd1=26.8 mg/L,Qmax1=13.7 mg/g,低亲和性结合位点的离解常数和最大吸附量为Kd2=114 mg/L,Qmax2=28.5 mg/g。在动态条件下,浓度为400 mg/L的咖啡因溶液以3BV/h的流速流经树脂床时,在第26BV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97.5%。
Caffeine-imprinted phenolic resin sorbent（CIPS） has been synthesized.The molecular recognition properties were evaluated by static and dynamic adsorption.By Scatchard analysis,it is found that CIPS shows specific binding sites.The dissociation constants and the maximum binding capacity were calculated Kd1=26.8 mg/L,Qmax1=13.7 mg/g for high affinity binding sites and Kd2=114 mg/L,Qmax2=28.5 mg/g for lower affinity binding sites,respectively.When 400 mg/L solution of caffeine at the rate of 3BV/h flowed through CIPS columns,breakthrough point was 26th bed volume under dynamic condition.It is clear that with 1 mol/L hydrochloric acid at the rate of desorption 1.5 BV/h,97.5% caffeine adsorbed on CIPS were removed within 4 bed volumes.
参考文献
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