Title: Interactions on External MOF Surfaces: Desorption of Water and Ethanol from CuBDC Nanosheets

Abstract

The external surfaces of metal-organic framework (MOF) materials are difficult to experimentally isolate due to the high porosities of these materials. MOF surface surrogates in the form of copper benzenedicarboxylate (CuBDC) nanosheets were synthesized using a bottomup approach and the surface interactions of water and ethanol were investigated by temperature programmed desorption (TPD). A method of analysis of diffusion-influenced TPD was developed to measure the desorption properties of these porous materials. This approach also allows the extraction of diffusion coefficients from TPD data. The transmission Fourier transform infrared spectra, powder X-ray diffraction patterns and TPD data indicate that water desorbs from CuBDC nanosheets with activation energies of 44±2 kJ/mol at edge sites and 58 ± 1 kJ/mol at external surface and internal and pore sites. Ethanol desorbs with activation energies of 58 ± 1 kJ/mol at internal pore sites and 66 ± 0.4 kJ/mol at external surface sites. Co-adsorption of water and ethanol was also investigated. The presence of ethanol was found to inhibit the desorption of water that results in a water desorption process with an activation energy of 68 ± 0.7 kJ/mol.

Authors:

Elder, Alexander C.  ^[1];

• Search DOE PAGES for author "Elder, Alexander C."
• Search DOE PAGES for ORCID "0000-0002-5041-4565"

Aleksandrov, Alexandr B. ^[1]; Nair, Sankar  ^[2];

• Search DOE PAGES for author "Nair, Sankar"
• Search DOE PAGES for ORCID "0000-0001-5339-470X"

Orlando, Thomas M. ^[1]

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+ Show Author Affiliations

1. Georgia Inst. of Technology, Atlanta, GA (United States). School of Chemistry and Biochemistry
2. Georgia Inst. of Technology, Atlanta, GA (United States). School of Chemical and Biomolecular Engineering

Publication Date:

Wed Sep 06 00:00:00 EDT 2017

Research Org.:

Energy Frontier Research Centers (EFRC) (United States). Center for Understanding and Control of Acid Gas-induced Evolution of Materials for Energy (UNCAGE-ME)

Sponsoring Org.:

USDOE Office of Science (SC), Basic Energy Sciences (BES)

OSTI Identifier:

1469893

Grant/Contract Number:  

SC0012577

Resource Type:

Accepted Manuscript

Journal Name:

Langmuir

Additional Journal Information:

Journal Volume: 33; Journal Issue: 39; Related Information: UNCAGE-ME partners with Georgia Institute of Technology (lead); Lehigh University; Oak Ridge National Laboratory; University of Alabama; University of Florida; University of Wisconsin; Washington University in St. Louis; Journal ID: ISSN 0743-7463

Publisher:

American Chemical Society

Country of Publication:

United States

Language:

English

Subject:

36 MATERIALS SCIENCE; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 77 NANOSCIENCE AND NANOTECHNOLOGY; catalysis (heterogeneous); defects; membrane; carbon capture; materials and chemistry by design; synthesis (novel materials); synthesis (self-assembly); synthesis (scalable processing)