Understanding the mechanism of monolayer adsorption from isotherm

IF 3 4区工程技术 Q3 CHEMISTRY, PHYSICAL

Adsorption Pub Date : 2024-07-03 DOI:10.1007/s10450-024-00512-4

Elena Butyrskaya

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Abstract

A new approach for understanding the mechanism of monolayer adsorption is proposed. The Langmuir model, which does not take into account sorbate-sorbate bonds, is the most common one for interpreting monolayer adsorption.When using it, the assumption about the absence of sorbate-sorbate interactions between the sorbate molecules of the first layer is never checked. However, the sorbate-sorbate interactions can make an important contribution to the adsorption energy at physical adsorption. In this case, the formation of sorbate clusters in first layer is an energetically preferable process compared to the process of individual molecules adsorption. The monolayer cluster adsorption model, which takes into account sorbate-sorbate interactions, was introduced in our previous works. In present work, based on the experimental isotherms analysis, a criterion for the mechanism of monolayer adsorption (cluster or adsorption of individual molecules) is proposed. Examples are given of the this criterion application to the study of the mechanism of carbon dioxide adsorption by IRMOF-6, IRMOF-11 and IRMOF-1, ethane by highly activated carbon Saran and methane by mica. This work develops a new approach to the interpretation of monolayer adsorption mechanism.

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从等温线了解单层吸附机理

本文提出了一种理解单层吸附机理的新方法。朗缪尔模型不考虑吸附剂-吸附剂键，是解释单层吸附的最常用模型。在使用该模型时，从未检查过第一层吸附剂分子之间不存在吸附剂-吸附剂相互作用的假设。然而，在物理吸附时，吸附剂与吸附剂之间的相互作用会对吸附能产生重要影响。在这种情况下，与单个分子吸附过程相比，在第一层形成吸附剂团簇在能量上是一个更可取的过程。我们在之前的研究中提出了考虑到吸附剂-吸附剂相互作用的单层团簇吸附模型。本研究在实验等温线分析的基础上，提出了单层吸附（团簇吸附或单个分子吸附）机制的标准。在研究 IRMOF-6、IRMOF-11 和 IRMOF-1 对二氧化碳的吸附机理，高活性碳 Saran 对乙烷的吸附机理，以及云母对甲烷的吸附机理时，举例说明了这一标准的应用。这项工作为解释单层吸附机理提供了一种新方法。

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来源期刊

Adsorption 工程技术-工程：化工

CiteScore

8.10

自引率

3.00%

发文量

审稿时长

2.4 months

期刊介绍： The journal Adsorption provides authoritative information on adsorption and allied fields to scientists, engineers, and technologists throughout the world. The information takes the form of peer-reviewed articles, R&D notes, topical review papers, tutorial papers, book reviews, meeting announcements, and news. Coverage includes fundamental and practical aspects of adsorption: mathematics, thermodynamics, chemistry, and physics, as well as processes, applications, models engineering, and equipment design. Among the topics are Adsorbents: new materials, new synthesis techniques, characterization of structure and properties, and applications; Equilibria: novel theories or semi-empirical models, experimental data, and new measurement methods; Kinetics: new models, experimental data, and measurement methods. Processes: chemical, biochemical, environmental, and other applications, purification or bulk separation, fixed bed or moving bed systems, simulations, experiments, and design procedures.