A Universal Mathematical Methodology in Characterization of Materials for Tailored Design of Porous Surfaces

Abstract

Understanding adsorption phenomena is essential to optimize and customize the energy transformation in numerous industrial and environmental processes. The complex and heterogeneous structure of the adsorbent surface and the distinct interaction of adsorbent-adsorbate pairs are attributed to the diverse response of adsorption phenomena, measured by the state diagrams of adsorption uptake known as adsorption isotherms. To understand various forms of adsorption isotherms, the surface characteristics of the adsorbent surface with the heterogeneity of adsorption energy sites must be analyzed so that they can be modified for the tailored response of the material. Conventionally, such material synthesis is based on chemical recipes or post-treatment. However, if the adsorbent's surface characteristics and heterogeneity are known, then a directed change in the material structure can be planned for the desired results in the adsorption processes. In this paper, a theoretical and mathematical methodology is discussed to analyze the structure of various adsorbents in terms of the distribution of their adsorption energy sites. The change in their surface is then analyzed, which results in the tailored or customized response of the material.

Tailored alumina nanocomposite membranes featuring MIL-125-NH2 metal-organic frameworks for oily wastewater treatment

“…However, within a wide range, the adsorption amount exhibits only insignificant changes until reaching saturation pressure, where it rapidly increases. This phenomenon can be elucidated by considering the energy distribution of adsorption sites within the MOF structure and the presence of multiple peak energy distribution functions 22,23 . At low partial pressures, the availability of vacant adsorption sites allows for efficient adsorption of N 2 molecules, resulting in high adsorption capacity.…”

Innovative Solid Desiccant Dehumidification Using Distributed Microwaves

“…Van der Waals force (or energy sites) attract water molecules onto the surface of sold desiccant material during dehumidification (Fig. 1a) [15]. Adsorbed water can be removed by pressure swing [16,17] and thermal swing [18].…”

Innovative solid desiccant dehumidification using distributed microwaves

“…In microwave dehumidi cation, the air becomes dehumidi ed due to the attraction of water molecules onto a solid adsorbent (desiccant) pore surface by Van der Walls forces 5 , and then the adsorbed water is removed by microwave irradiation. The former process is named adsorption [6][7][8][9][10] , and the latter is known as desorption.…”