苹果汁中展青霉素的去除动力学与热力学研究
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陕西省科技统筹创新工程计划资助项目(2015KTCL02-02)和“十二五”国家科技支撑计划资助项目(2012BAD31B01)


Adsorption Thermodynamics and Kinetics of Patulin Separation from Apple Juice Using Adsorbent Resin
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    摘要:

    利用Langmuir、Freundlich及Temkin吸附等温模型对LSA-800B型树脂吸附苹果汁中展青霉素的等温线数据进行拟合,确定较佳吸附模型,并且对吸附过程的热力学性质进行研究。此外,利用Lagergren拟一级、McKay拟二级吸附速率模型和Weber-Morris颗粒内扩散模型对LSA-800B型树脂吸附苹果汁中展青霉素的静态吸附过程进行分析,确定较佳的吸附速率模型及吸附机理。结果表明: LSA-800B型树脂吸附苹果汁中展青霉素符合Freundlich吸附等温模型;吸附自由能变量ΔG<0,证明LSA-800B型树脂对展青霉素的吸附是自发的物理过程;吸附焓变量ΔH<0,说明吸附过程是放热过程,温度降低有利于展青霉素的吸附;吸附熵变量ΔS<0,说明水分子不易对被吸附的展青霉素进行解析,解析过程需要其他溶剂;Lagergren拟一级吸附速率模型适合描述吸附过程的动力学,Weber-Morris颗粒内扩散模型揭示其吸附过程由液膜扩散和颗粒内扩散共同控制。

    Abstract:

    China is the biggest apple juice producer in the world. High content of patulin in apple juice can cause severe food safety problem. Adsorbent resins have been applied to apple juice treatment to remove patulin due to their high adsorption abilities. However, the adsorption thermodynamics and kinetics studies of patulin separation from apple juice using adsorbent resin are still limited. The adsorption characteristics of patulin in apple juice were investigated using LSA-800B resin, with the aim to reduce the content of patulin and improve apple juice security. Results showed that the adsorption ability (qe) of the LSA-800B resin decreased with the increase of temperature. The Freundlich isotherm was found to describe the adsorption equilibrium satisfactorily (R2>0.97). Thermodynamic parameters including the changes of free energy (ΔG), enthalpy (ΔH), and entropy (ΔS) were evaluated at 30, 40 and 50℃. The result of free energy change (ΔG<0) demonstrated that it’s a spontaneous adsorption process and involved physical adsorption. The enthalpy change ΔH<0 indicated that the adsorption was exothermal in nature. The kinetic data was best described by the pseudo first-order model. The Weber-Morris model showed that the adsorption mechanism was not limited solely by intra-particle diffusion. It is proposed that the result of this theoretical study of patulin adsorption of apple juice using LSA-800 resin can be a basis for industry control of patulin in the producing of apple juice.

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高振鹏,张丹,刘瑞,袁亚宏,岳田利.苹果汁中展青霉素的去除动力学与热力学研究[J].农业机械学报,2015,46(10):304-310. Gao Zhenpeng, Zhang Dan, Liu Rui, Yuan Yahong, Yue Tianli. Adsorption Thermodynamics and Kinetics of Patulin Separation from Apple Juice Using Adsorbent Resin[J]. Transactions of the Chinese Society for Agricultural Machinery,2015,46(10):304-310.

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  • 收稿日期:2015-04-26
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  • 在线发布日期: 2015-10-10
  • 出版日期: 2015-10-10