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EDITORIAL article

Front. Chem., 06 April 2021 | https://doi.org/10.3389/fchem.2021.668553

Editorial: Physisorption of Gases: Adsorbent Characterization, Adsorbent-Adsorbate Equilibrium and Kinetics

  • 1Institute for Sorption and Problems of Endoecology, National Academy of Sciences (NAS) of Ukraine, Kyiv, Ukraine
  • 2Royal Military Academy, Brussels, Belgium
  • 3Department of Chemical Engineering, University of South Carolina, Columbia, SC, United States
  • 4Instituto de Ciencia y Tecnología del Carbono INCAR-Consejo Superior de Investigaciones Científicas (CSIC), Oviedo, Spain

The purpose of this Research Topic is to get an overview of new advances in the synthesis of new selective adsorbents that can reduce greenhouse gas emissions; in methods of surface modification of adsorbents and their influence on adsorption properties; and also to show new methods of characterization of porous structure and surface properties in terms of the pore size distribution and adsorption energy distribution calculated from experimental data on gas adsorption.

To reduce the emissions of greenhouse gases, particularly of CO2, ionic liquid/metal-organic framework composites, using ZIF-8 as the original material, were synthesized by Ferreira et al.. For the entire range pressure investigated, i.e., 0.5 and 16 atm, the prepared composites showed superior volume capacities and CO2 selectivities over N2 or CH4 relative to pristine ZIF-8. In particular, the composite [C4MIM]2[MnCl4]@ZIF-8 exhibited a different low-pressure selectivity trend from the original ZIF-8, with a 33% increase in the CO2/N2 selectivity at 1 bar and a 19% increase in the CO2/CH4 selectivity at 10 bar. This material shows potential for use in a post-combustion CO2 capture application that can contribute to greenhouse gas mitigation.

The impact of fluorination on the texture and surface chemistry of activated carbon fiber (ACF) was studied by Velasco et al.. It has been shown that mild fluorination not only can preserve most of the textural properties of the parent ACF but also enhance the water uptake at the first stages of the water sorption process, together with a shift in the upswing of the water isotherms toward lower relative humidity. On the contrary, a higher concentration of fluorine has led to highly fluorinated fibers with lower porosity and a more hydrophobic character. Moreover, they presented lower chemical stability as demonstrated by a change in the shape of the water isotherms after two consecutive measurements. The kinetics of water sorption in the ACFs provided further insights into the different sorption phenomena involved. Hence, water sorption can help to tailor the water affinity, stability, and performance of fluorinated porous carbon materials under humid conditions.

An efficient method to characterize pore size distribution (PSD) of activated carbons was proposed by de Oliveira et al.. The method chooses a limited number of representative pores, which will constitute a simplified kernel to describe the PSD which is later applied to predict the adsorption equilibrium of other gases. The method allows quick solutions for large-scale calculations for carbonaceous materials screening. It also gives access to an easily understood and prompt evaluation of the structure-property relationship of activated carbons. The authors applied this method to the removal of organic contaminants in dilute aqueous solutions.

A theoretical and mathematical methodology based on the condensation approximation approach is described by Burhan et al.. The method intends to analyze the structure of various adsorbents in terms of the distribution of their adsorption energy sites. The use of this method for the analysis of nitrogen adsorption isotherms on various adsorbents was demonstrated.

The Guest Editors of this Research Topic are grateful to all the authors for the submitted articles and to all the reviewers for their comments on the manuscripts. We hope that readers will find the articles included in this Research Topic interesting and useful for their research. Finally, we are grateful to the editorial staff of Frontiers in Chemistry for their work in publishing this issue of Research.

Author Contributions

All authors contributed to manuscript revision, read, and approved the submitted version.

Conflict of Interest

The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

Acknowledgments

The Guest Editors of this Research Topic are grateful to all the authors for the submitted articles and to all the reviewers for their comments on the manuscripts. We hope that readers will find the articles included in this Research Topic interesting and useful for their research. Finally, we are grateful to the editorial staff of Frontiers in Chemistry for their work in publishing this issue of Research.

Keywords: adsorption, characterization, porous structure, kinetics of adsorption, dynamics of adsorption

Citation: Puziy AM, Lodewyckx P, Ritter JA, Ebner AD and Suarez-Garcia F (2021) Editorial: Physisorption of Gases: Adsorbent Characterization, Adsorbent-Adsorbate Equilibrium and Kinetics. Front. Chem. 9:668553. doi: 10.3389/fchem.2021.668553

Received: 16 February 2021; Accepted: 15 March 2021;
Published: 06 April 2021.

Edited and reviewed by: Malgorzata Biczysko, Shanghai University, China

Copyright © 2021 Puziy, Lodewyckx, Ritter, Ebner and Suarez-Garcia. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

*Correspondence: Alexander M. Puziy, alexander.puziy@gmail.com