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大孔树脂对竹叶总黄酮的吸附平衡和动力学 被引量:10

Adsorption equilibrium and kinetics of bamboo flavonoids on AB-8 resin
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摘要 考察了7种大孔树脂对竹叶总黄酮的吸附及解吸特性,发现AB-8大孔树脂具有较高的吸附选择性和良好的脱附性能,并采用静态吸附实验研究了AB-8大孔树脂对竹叶总黄酮的吸附平衡和动力学特性。结果表明,Freundlich方程可较好地描述竹叶总黄酮在AB-8树脂上的吸附平衡;吸附自由能变?G<0,熵变?S>0,吸附为自发的熵增过程,升高温度有利于吸附分离。焓变?H为13.45 kJ/mol,在氢键键能范围内;吸附竹叶总黄酮前后树脂的红外谱图也表明,AB-8树脂对竹叶总黄酮分子的吸附是以氢键形式发生的物理吸附。动力学研究表明,吸附过程符合二级动力学方程,颗粒外的液膜扩散是决定吸附速率的主要步骤。 Seven types of macroporous resin were selected to compare their performances in adsorbing and desorbing bamboo flavonoids.AB-8 macroporous resin showed high selectivity and good desorption property.Static sorption experiments were carried out to study the adsorption equilibrium and kinetics of bamboo flavonoids on AB-8 macroporous resin at different temperatures.The results indicated that Freundlich equation was the best for the description of the adsorption equilibrium of bamboo flavonoids on AB-8 resin,the negative value of ΔG and the positive value of ?S showed that the adsorption was a spontaneous process of increased entropy,and the increase of temperature would benefit the adsorption process.The adsorption heat ?H was 13.45 kJ/mol within the range of hydrogen bond energy;and the FT-IR spectra of AB-8 resins before and after bamboo flavonoids adsorption further suggested that the adsorption of bamboo flavonoids on AB-8 resin was a type of physical adsorption with hydrogen bond.The kinetics results revealed the adsorption followed a pseudo-second-order reaction,and the adsorption rate was mainly decided by the film diffusion.
出处 《化工进展》 EI CAS CSCD 北大核心 2011年第10期2158-2162,2177,共6页 Chemical Industry and Engineering Progress
基金 国家大学生创新性实验计划项目(091035947)
关键词 竹叶总黄酮 AB-8树脂 吸附平衡 动力学 bamboo flavonoids AB-8 resin adsorption equilibrium kinetics
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