Journal
SCIENCE OF THE TOTAL ENVIRONMENT
Volume 793, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.scitotenv.2021.148622
Keywords
MOFs; VOCs; Hierarchical porous; Toluene adsorption; Regeneration
Categories
Funding
- National Key Research and Development Program of China [2018YFB0605200]
- National Natural Science Foundation of China [51976110]
- Young Scholars Program of Shandong University [2018WLJH75]
Ask authors/readers for more resources
This study synthesized and evaluated three Fe-based MOFs for toluene adsorption, with MIL-100(Fe) showing the highest equilibrium adsorption capacity. Toluene adsorption on MIL-100(Fe) followed pseudo-first order kinetics and Langmuir isotherm model, primarily attributed to pi-pi stacking interaction.
In light of the promising merits of large surface area, uniform pore size, and tunable functional groups, metal-organic frameworks (MOFs) have great potential to be utilized for adsorbing volatile organic compounds (VOCs). In this study, three Fe-based MOFs, MIL-100(Fe), MIL-101(Fe), and MIL-53(Fe), were synthesized systematically and used to adsorb a typical VOC, toluene. Static adsorption, dynamic breakthrough curves, and adsorption kinetics were conducted to assess the adsorption performance. Additionally, the surface functional groups, pore structure, and morphology were systematically characterized by means of XRD, SEM, XPS, FTIR and N-2 adsorption-desorption analyses to reveal the cause of the difference in adsorption of these Fe-based MOFs. The results revealed that the maximum equilibrium adsorption capacity of 663 mg/g was achieved by MIL-100(Fe) with the highest specific surface area and pore volume. The dynamic adsorption of toluene on MIL-100(Fe) was in accordance with the pseudo-first order kinetic model and the Langmuir isothermal model. The formed pi-pi stacking interaction between organic ligands and the benzene ring in the MIL-100(Fe) cluster is the primary adsorption mechanism based on XPS analysis. Moreover, MIL-100(Fe) was easily regenerated via microwave irradiation with a negligible adsorption capacity decrease after three cycles. This work highlights the feasibility of hierarchical porous Fe-based MOFs as toluene adsorbents and promotes the application of MOFs in the field of pollution control. (C) 2021 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available