磁性壳聚糖微球吸附苹果渣多酚的动力学及热力学分析

为了更好的利用胺基化磁性壳聚糖微球吸附分离苹果渣多酚的工艺,对其反应动力学和热力学进行了研究。主要采用Langmuir准一级动力学模型、Langmuir准二级动力学模型、Elovich方程及内扩散方程对吸附反应动力学过程进行拟合,并利用Langmuir等温吸附模型、Freundlich等温吸附模型及Temkin等温吸附模型对吸附反应热力学特性进行解析。结果表明：吸附动力学过程符合准二级动力学模型的描述,吸附温度越高,吸附速率常数和初始吸附速率越大,且平衡吸附量越高。吸附热力学过程符合Freundlich等温吸附模型,热力学参数ΔG〈0,ΔH〉0,ΔS〉0,表明胺基化磁性壳聚糖微球对苹果渣多酚的...

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Bibliographic Details
Published in农业工程学报 Vol. 28; no. 16; pp. 264 - 269
Main Author 袁亚宏 蔡露阳 岳田利 高振鹏 赵旭博
Format Journal Article
LanguageChinese
Published 西北农林科技大学食品科学与工程学院,杨凌,712100 2012
Subjects
动力学
吸附
热力学
胺基化磁性壳聚糖微球
苹果渣多酚
热力学
动力学
胺基化磁性壳聚糖微球
吸附
苹果渣多酚
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ISSN1002-6819
DOI10.3969/j.issn.1002-6819.2012.16.041

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Summary:为了更好的利用胺基化磁性壳聚糖微球吸附分离苹果渣多酚的工艺,对其反应动力学和热力学进行了研究。主要采用Langmuir准一级动力学模型、Langmuir准二级动力学模型、Elovich方程及内扩散方程对吸附反应动力学过程进行拟合,并利用Langmuir等温吸附模型、Freundlich等温吸附模型及Temkin等温吸附模型对吸附反应热力学特性进行解析。结果表明：吸附动力学过程符合准二级动力学模型的描述,吸附温度越高,吸附速率常数和初始吸附速率越大,且平衡吸附量越高。吸附热力学过程符合Freundlich等温吸附模型,热力学参数ΔG〈0,ΔH〉0,ΔS〉0,表明胺基化磁性壳聚糖微球对苹果渣多酚的吸附过程可以自发进行,并且是伴随着焓变〉0的吸热过程。动力学及热力学研究为利用胺基化磁性壳聚糖微球进行苹果渣多酚的提取分离提供了技术依据。
Bibliography:Yuan Yahong, Cai Luyang, Yue Tianli, Gao Zhenpeng, Zhao Xubo （College of Food Science and Engineering, Northwest Agriculture and Forestry University, Yangling 712100, China）
11-2047/S
The aim of this study was to study the kinetics and thermodynamics of apple polyphenols adsorption by aminated magnetic chitosan microspheres. The pseudo-first-order kinetics model, pseudo-second-order kinetics model, Elovich equation and pore diffusion equation were used to fit the adsorption kinetics process. Three isothermal adsorption models （Langmuir, Freundlich and Temkin） were used to analysis adsorption thermodynamics properties. The results showed that adsorption kinetics process conformed to the pseudo-second-order kinetics model. Adsorption rate constant, initial adsorption rate and equilibrium adsorption content tended to increase with the increasing of the temperature, and adsorption amount was higher. Adsorption thermodynamics conformed to Freundlich isothermal adsorption model. The results of thermodynamic parameter
ISSN:1002-6819
DOI:10.3969/j.issn.1002-6819.2012.16.041