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蘋(píng)果汁中展青霉素的去除動(dòng)力學(xué)與熱力學(xué)研究
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陜西省科技統(tǒng)籌創(chuàng)新工程計(jì)劃資助項(xiàng)目(2015KTCL02-02)和“十二五”國(guó)家科技支撐計(jì)劃資助項(xiàng)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吸附等溫模型對(duì)LSA-800B型樹(shù)脂吸附蘋(píng)果汁中展青霉素的等溫線數(shù)據(jù)進(jìn)行擬合,確定較佳吸附模型,,并且對(duì)吸附過(guò)程的熱力學(xué)性質(zhì)進(jìn)行研究,。此外,,利用Lagergren擬一級(jí)、McKay擬二級(jí)吸附速率模型和Weber-Morris顆粒內(nèi)擴(kuò)散模型對(duì)LSA-800B型樹(shù)脂吸附蘋(píng)果汁中展青霉素的靜態(tài)吸附過(guò)程進(jìn)行分析,,確定較佳的吸附速率模型及吸附機(jī)理,。結(jié)果表明: LSA-800B型樹(shù)脂吸附蘋(píng)果汁中展青霉素符合Freundlich吸附等溫模型;吸附自由能變量ΔG<0,,證明LSA-800B型樹(shù)脂對(duì)展青霉素的吸附是自發(fā)的物理過(guò)程,;吸附焓變量ΔH<0,,說(shuō)明吸附過(guò)程是放熱過(guò)程,溫度降低有利于展青霉素的吸附,;吸附熵變量ΔS<0,,說(shuō)明水分子不易對(duì)被吸附的展青霉素進(jìn)行解析,解析過(guò)程需要其他溶劑,;Lagergren擬一級(jí)吸附速率模型適合描述吸附過(guò)程的動(dòng)力學(xué),,Weber-Morris顆粒內(nèi)擴(kuò)散模型揭示其吸附過(guò)程由液膜擴(kuò)散和顆粒內(nèi)擴(kuò)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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高振鵬,張丹,劉瑞,袁亞宏,岳田利.蘋(píng)果汁中展青霉素的去除動(dòng)力學(xué)與熱力學(xué)研究[J].農(nóng)業(yè)機(jī)械學(xué)報(bào),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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  • 在線發(fā)布日期: 2015-10-10
  • 出版日期: 2015-10-10
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