Langmuir吸附等温式推导浅析

Brief Analysis of Deduction of Langmuir Adsorption Isotherm

介绍了3种典型的Langmuir吸附等温式推导方法,分别是吸附动力学、吸附热力学和德博尔吸附理论。重点提出了一种新的Langmuir吸附等温式推导方法——化学反应类比法,并引入可调参数ν1。推导出的吸附等温式通过ν1的取值变化既能描述单分子层吸附也能描述多分子层吸附,且当ν1在不同的范围内时,其吸附等温曲线形状与Ⅰ型、Ⅲ型、Ⅴ型吸附等温线形状相同。总结和比较了这几种推导方法的核心机理,探究了气固吸附的本质特征。

We presented three classical deduction methods of Langmuir adsorption isotherm, namely, adsorption kinetics, adsorption thermodynamics, and DeBoen adsorption theory. Moreover, we mainly put forward a new deduction method -chemical reaction analogism, which introduced an adjustable parameter Ⅴ1. Through the change of Ⅴ1 ,the deduced adsorption isotherm can describe monolayer adsorption as well as multimolecular layer adsorption. When Ⅴ1 is in different ranges, the shape of adsorption isotherm curve is the same as that of type Ⅰ ,Ⅲ ,and Ⅴ adsorption isotherms. We summarized and compared the core mechanisms of these deduction methods, and explored the substantive characteristics of gas-solid adsorption.