D-101大孔吸附树脂吸附构树叶总黄酮的研究

Adsorption Study of Total Flavonoids from Broussonetia papyrifera Leaves by D-101 Macroporous Adsorption Resin

本论文通过研究大孔树脂对构树叶黄酮吸附过程中动力学与热力学的变化,寻找大孔吸附树脂对该体系吸附能力的规律。结果表明,大孔吸附树脂对构树叶黄酮的吸附在9 h后达到平衡,且吸附过程符合二级动力学方程;不同温度下该大孔吸附树脂对构树叶黄酮的吸附等温线采用Freundlich和Langmuir等温吸附方程进行拟合,结果与Freundlich等温吸附模型拟合度较高,说明该吸附为优惠吸附,同时吸附焓变ΔH<0、吸附自由能ΔG<0、吸附熵变ΔS>0,说明大孔吸附树脂对构树叶黄酮的吸附过程是放热的,该吸附过程为自发不可逆过程,且吸附有明显的物理吸附特性。

The dynamics and thermodynamics model about the process of macroporous resin adsorption for flavonoids in Broussonetia papyrifera leaves extracts has not been reported. In order to find the law of the process,this study investiga- ted the adsorption kinetics and thermodynamics behavior of flavonoids in B. papyrifera leaves extracts on D-101-type macroporous adsorption resin. The results showed that the macroporous resin adsorption process for flavonoids in B. papy- rifera leaves extracts reached balance after 9 hours. The adsorption fitted with the pseudo-second-order kinetic model. Static adsorption isotherms at different temperatures illustrated that the process of adsorption for flavonoids in B. papyrif- era leaves extracts was well fitted by Freundlich-type isotherm equation and the adsorption was favorable type.AH 〈 0, AG 〈 0 and AS 〉 0 indicated that the adsorption was an exothermie process and enthalpv Dromotin- process.