液体介质中的朗缪尔吸附动力学：界面反应模型,ACS Omega

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液体介质中的朗缪尔吸附动力学：界面反应模型
ACS Omega ( IF 3.7 ) Pub Date : 2021-05-26 , DOI: 10.1021/acsomega.1c01449
Md Akhtarul Islam ₁ , Myisha Ahmed Chowdhury ₁ , Md. Salatul Islam Mozumder ₁ , Md. Tamez Uddin ₁

Affiliation

假设吸附动力学方程遵循固-液界面上的非均相化学反应行为。该方程转化为平衡时的朗缪尔等温线，很好地描述了非稳态吸附过程。在此基础上，开发了一个工作方程，该方程给出了与包括浓度在内的操作参数无关的吸附速率常数。此外，一个动力学模型表示为文献中可用的一阶和二阶系统的总和（用界面反应概念修改）来确定吸附速率常数。两种方法都给出了相似的结果。已经开发了三个无量纲数来确定和区分从化学动力学的角度证明的伪一级和伪二级动力学。结果表明，具有高相关系数的曲线拟合可以验证经验动力学模型，但如果模型本身不是基于明确定义的化学动力学，则拟合模型参数不能自动与化学动力学参数相关。最后得出结论，目前应用的经验方法不能为类似系统之间的比较提供可靠的数据，而基于多相反应概念开发的朗缪尔动力学方程将为吸附系统表征方法的标准化提供良好的基础。结果表明，具有高相关系数的曲线拟合可以验证经验动力学模型，但如果模型本身不是基于明确定义的化学动力学，则拟合模型参数不能自动与化学动力学参数相关。最后得出结论，目前应用的经验方法不能为类似系统之间的比较提供可靠的数据，而基于多相反应概念开发的朗缪尔动力学方程将为吸附系统表征方法的标准化提供良好的基础。结果表明，具有高相关系数的曲线拟合可以验证经验动力学模型，但如果模型本身不是基于明确定义的化学动力学，则拟合模型参数不能自动与化学动力学参数相关。最后得出结论，目前应用的经验方法不能为类似系统之间的比较提供可靠的数据，而基于多相反应概念开发的朗缪尔动力学方程将为吸附系统表征方法的标准化提供良好的基础。

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Langmuir Adsorption Kinetics in Liquid Media: Interface Reaction Model

Adsorption kinetic equation has been derived assuming that the process follows the behavior of a heterogeneous chemical reaction at the solid–liquid interface. This equation is converted into the Langmuir isotherm at equilibrium and describes well the unsteady-state adsorption process. Based on that, a working equation has been developed, which gives adsorption-rate-constant independent of operating parameters including concentration. Also, a kinetic model expressed as a sum of first- and second-order systems available in the literature has been applied (modified with the interface reaction concept) to determine the adsorption rate constant. Both methods gave similar results. Three dimensionless numbers have been developed to determine and distinguish pseudo-first-order and pseudo-second-order kinetics justified from the viewpoint of chemical kinetics. It is shown that curve-fitting with a high correlation coefficient could validate an empirical kinetic model, but the fitted model parameters could not automatically be related to chemical kinetic parameters if the model itself is not grounded on well-defined chemical kinetics. Finally, it is concluded that the currently applied empirical approach could not provide reliable data for comparison among similar systems, while the Langmuir kinetic equation developed based on the concept of heterogeneous reaction would be a good basis for standardization of the method for adsorption system characterization.

更新日期：2021-06-08

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