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Derivation of adsorption capacity and adsorption isotherm by a single adsorbate concentration in liquid–solid system
Chemical Papers ( IF 2.2 ) Pub Date : 2021-01-11 , DOI: 10.1007/s11696-020-01476-9
Jiaxin Zhang , Jiakun Bai , Meijiao Duan , Jian Yang , Liujiao Bian

A novel approach was presented as a strategy for deriving adsorption capacity and isotherm by a single adsorbate concentration in the liquid–solid system with experimental proof utilizing frontal chromatography (FC). A breakthrough curve equation presented in this work shows the dependence of adsorbate concentration in feed solution on time in FC and can be used to derive three characteristic binding parameters n (the number of the adsorbates bound to adsorbents), K (the adsorption equilibrium constant of adsorbates) and na (the total number of the adsorption sites). Moreover, the adsorption capacity and isotherm could be derived by a single breakthrough curve, even part of it. The equation was verified with the breakthrough curves of some arene and proteins on reversed-phase, ion-exchange, hydrophobic and affinity media, showing good fitness and consistent with the classical static method and elution peak method. Besides, all the adsorption data were referred to the type I adsorption of the Langmuir isotherm. This work presented new insight that utilizing a single breakthrough curve to determine adsorption parameters and isotherms and may provide some perspective for the determination of physico-chemical property and performance study of very rare substances.



中文翻译:

液固体系中单一吸附物浓度的吸附容量和吸附等温线的推导

提出了一种新颖的方法,作为通过液-固系统中单一吸附物浓度得出吸附容量和等温线的策略,并利用额叶色谱(FC)进行了实验证明。这项工作中提出的突破曲线方程式显示了FC中进料溶液中吸附物浓度随时间的变化,可以用来推导三个特征性的结合参数n(与吸附剂结合的吸附物的数量),K(吸附剂的吸附平衡常数)。被吸附物)和n a(吸附位点的总数)。而且,吸附容量和等温线可以由一条甚至部分的穿透曲线得出。用某些芳烃和蛋白质在反相,离子交换,疏水和亲和介质上的穿透曲线验证了该方程,显示出良好的适用性并且与经典的静态方法和洗脱峰方法一致。此外,所有的吸附数据都被称为Langmuir等温线的I型吸附。这项工作提出了新的见解,即利用单个突破曲线来确定吸附参数和等温线,并可能为确定稀有物质的理化性质和性能研究提供一些依据。

更新日期:2021-01-11
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