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Modelling toluene sorption in ionic liquid/metal organic framework composite materials.

Authors :
Ramos VC
Han W
Zhang X
Zhang S
Yeung KL
Source :
Environmental research [Environ Res] 2023 Feb 15; Vol. 219, pp. 115000. Date of Electronic Publication: 2022 Dec 16.
Publication Year :
2023

Abstract

Toluene is a prevalent pollutant in indoor environments and its removal is essential to maintain a healthy environment. Adsorption is one of the best alternatives for organic vapours removal, specially at low indoor concentrations. Metal Organic Frameworks (MOFs) and Ionic Liquids (ILs) are potential materials for this mean. In this work, the synthesis and application of IL/MOF composite materials for toluene removal is reported. Loading [BMIM][CH <subscript>3</subscript> COO] ionic liquid into MIL101 porous structure improves parent materials affinity towards toluene capture by two orders of magnitude (as Henry's constants, attesting to their synergy). MIL101(Cr) and absorption in [BMIM][CH <subscript>3</subscript> COO] IL is best described by Henry's Law, while the Langmuir adsorption model predicts toluene adsorption on [BMIM][CH <subscript>3</subscript> COO]/MIL101(Cr) better than Freundlich and Toth equations. Diffusional and kinetics models revealed that toluene diffusion is the rate limiting step for pristine MIL101. Kinetic and diffusion rates were systematically improved upon the incorporation of the ionic liquid due to shorter toluene hops with the adsorbed IL and the increased hydrophobicity in the composites making the sorption more favourable. This study provides a systematic analysis and modelling of the toluene capture process in IL/MOF composites aiding a better understanding of the sorption process in these novel materials.<br />Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.<br /> (Copyright © 2022 Elsevier Inc. All rights reserved.)

Details

Language :
English
ISSN :
1096-0953
Volume :
219
Database :
MEDLINE
Journal :
Environmental research
Publication Type :
Academic Journal
Accession number :
36529328
Full Text :
https://doi.org/10.1016/j.envres.2022.115000