In our study we prepared MOF-5 derived carbon to reveal the thermodynamics of CO absorption processes in great detail. Porous carbon material was prepared from a metal-organic framework (MOF-5) carbonization at 1000 °C. The obtained structure consists only of carbon and exhibits a BET specific surface area, total pore volume and micropore volume of 1884 m g, 1.84 cm g and 0.59 cm g, respectively. Structural analysis allowed the assumption that this material is an ideal candidate for efficient CO absorption. The CO uptake was 2.43 mmol g at 25 °C and 1 bar. Additionally, the absorption over a wide range of temperatures (25, 40, 60, 80 and 100 °C) and pressures (in range of 0-40 bar) was investigated. It is shown that the CO absorption isotherm fits a multitemperature Sips model. The calculated Sips equation parameters allows the isosteric heat of adsorption to be obtained. The isosteric heat of adsorption for CO decreased substantially with an increase in surface coverage by gas molecules. This indicates a negligible intermolecular interaction between CO molecules. A decrease in the isosteric heat of adsorption with surface coverage is a result of the disappearance of favourable adsorption sites.
Download full-text PDF |
Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9064818 | PMC |
| http://dx.doi.org/10.1039/c9ra01786k | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Exploring the Fluorination and Hydroxylation of Pore-space-partitioned Metal‒Organic Frameworks for C2H2/CH4 Separation.
Chem Asian J
January 2025
National Cheng Kung University, School of Pharmacy, No.1, University Rd., 70101, Tainan City, TAIWAN.
We report three novel pore-space-partitioned metal‒organic frameworks (MOFs) functionalized with fluorine and hydroxyl groups using 2,3,5,6-tetrafluorobenzene-1,4-dicarboxylic acid (F4-BDC) and a new ligand 3,6-difluoro-2,5-dihydroxybenzene-1,4-dicarboxylic acid (F2(OH)2-BDC) as organic building blocks, with 1,3,5-tris(4-pyridyl)-2,4,6-triazine (TPT) as pore partition agent. With the polar fluorine and hydroxyl groups and the open metal sites being blocked by TPT, moderate molecule-framework interactions can be engineered. These three isoreticular microporous frameworks Mn-TPT-BDC-F4 (NCKU-21), Mn-TPT-BDC-F2(OH)2 (NCKU-22), and Mg-TPT-BDC-F2(OH)2 (NCKU-23) (NCKU = National Cheng Kung University) exhibit distinct single-component gas adsorption behaviors.
View Article and Find Full Text PDFElucidating Thermodynamically Driven Structure-Property Relations for Zeolite Adsorption Using Neural Networks.
JACS Au
December 2024
Department of Chemical and Biomolecular Engineering, Lehigh University, Bethlehem, Pennsylvania 18015, United States.
Understanding the origin and effect of the confinement of molecules and transition states within the micropores of a zeolite can enable targeted design of such materials for catalysis, gas storage, and membrane-based separations. Linear correlations of the thermodynamic parameters of molecular adsorption in zeolites have been proposed; however, their generalizability across diverse molecular classes and zeolite structures has not been established. Here, using molecular simulations of >3500 combinations of adsorbates and zeolites, we show that linear trends hold in many cases; however, they collapse for highly confined systems.
View Article and Find Full Text PDFMoisture sorption isotherm and thermodynamic analysis of egg powders dried by foam-mat-assisted refractance window drying.
J Sci Food Agric
November 2024
Engineering Faculty, Food Engineering Department, Necmettin Erbakan University, Konya, Türkiye.
Article Synopsis
- The study assessed the moisture sorption isotherm and thermodynamic properties of dried egg powders (EWP, EYP, WEP) to understand their moisture absorption behaviors.
- The egg powders exhibited a type II adsorption isotherm and showed the highest fitting accuracy with the Peleg model, with monolayer moisture content ranging from 0.02 to 0.09 g/g.
- Findings indicated that increasing moisture content and temperature led to decreased thermal energy values, highlighting the importance of reaching monolayer moisture for enhanced shelf stability and predicting energy needs in egg powder drying.
Development and CO capture of nitrogen-enriched microporous carbon by coupling waste polyamides with lignocellulosic biomass.
J Environ Manage
October 2024
State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou, 310027, China. Electronic address:
Due to the substantial emissions of global CO, there has been growing interest in nitrogen-enriched porous carbonaceous materials that possess exceptional CO capture capabilities. In this study, a novel N-enriched microporous carbon was synthesized by integrating waste polyamides with lignocellulosic biomass, involving carbonization and physicochemical activation. As-synthesized adsorbents demonstrated significant characteristics including a high specific surface area (1710 m/g) and a large micropore volume (0.
View Article and Find Full Text PDFComparison of surface adsorption efficacies of eco-sustainable agro/animal biomass-derived activated carbon for the removal of rhodamine B and hexavalent chromium.
Environ Sci Pollut Res Int
August 2024
Department of Environment Science and Technology, Central University of Punjab, Bathinda, 151001, Punjab, India.
Article Synopsis
- Effective management strategies are essential for reducing the impact of organic and inorganic contaminants on the environment and human health, and this study explores using biomass-derived activated carbons from cotton shells, rice husks, and wasp hives as an innovative solution.
- The research finds that cotton shell activated carbon (CSAC) is particularly effective in removing hexavalent chromium (Cr(VI)), while rice husk activated carbon (RHAC) excels at adsorbing rhodamine B (Rh B), with different optimal conditions identified for each contaminant.
- Kinetic and thermodynamic analyses suggest that the adsorption mechanisms involve both chemical and physical processes, with various techniques confirming the effectiveness of the biomass-derived activated carbons for pollutant removal.
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!