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Open AccessArticle

The Effects of Functional Groups and Missing Linkers on the Adsorption Capacity of Aromatic Hydrocarbons in UiO-66 Thin Films

1
Department of Chemistry and Biochemistry, The University of Alabama, Tuscaloosa, AL 35487, USA
2
Department of Biological and Chemical Engineering, The University of Alabama, Tuscaloosa, AL 35487, USA
*
Author to whom correspondence should be addressed.
Received: 26 November 2020 / Revised: 17 December 2020 / Accepted: 21 December 2020 / Published: 26 December 2020
(This article belongs to the Section Organometallic Chemistry)
The adsorption of benzene, toluene, ethylbenzene, and xylene isomers, also known as BTEX, from the gas phase into porous thin films of the metal–organic framework UiO-66-X, where X = H, NH2, and NO2, was measured to quantify adsorption capacity. The thin films were grown by a vapor-conversion method onto Au-coated quartz microbalance crystals. The MOF thin films were characterized by IR and Raman spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy and scanning electron microscopy. The thin films were activated by heating under high vacuum and exposed to each gas to calculate the Henry’s constant. The results demonstrate that the functional groups in the organic linker and missing-linkers both play important roles in the adsorption capacity. Several trends can be observed in the data. First, all the compounds in the BTEX family have lower Henry’s constants in the UiO-66-H films compared to the UiO-66-NH2 and UiO-66-NO2 films, which can largely be attributed to the absence of a functional group on the linker. Second, at 25 °C, the Henry’s constants for all the BTEX compounds in UiO-66-NO2 films are larger than UiO-66-NH2 films. Third, the role of missing linkers is addressed by comparing the measured adsorption capacity to ideal pore filling. The results show that the UiO-66-H films are the most defect-free and the UiO-66-NO2 films have the most missing linker defects. View Full-Text
Keywords: BTEX adsorption; Henry’s constant; metal–organic framework; thin films BTEX adsorption; Henry’s constant; metal–organic framework; thin films
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MDPI and ACS Style

Shankwitz, J.; Speed, D.; Sinanan, D.; Szulczewski, G. The Effects of Functional Groups and Missing Linkers on the Adsorption Capacity of Aromatic Hydrocarbons in UiO-66 Thin Films. Inorganics 2021, 9, 1. https://0-doi-org.brum.beds.ac.uk/10.3390/inorganics9010001

AMA Style

Shankwitz J, Speed D, Sinanan D, Szulczewski G. The Effects of Functional Groups and Missing Linkers on the Adsorption Capacity of Aromatic Hydrocarbons in UiO-66 Thin Films. Inorganics. 2021; 9(1):1. https://0-doi-org.brum.beds.ac.uk/10.3390/inorganics9010001

Chicago/Turabian Style

Shankwitz, Jennifer; Speed, Daniel; Sinanan, Dillon; Szulczewski, Greg. 2021. "The Effects of Functional Groups and Missing Linkers on the Adsorption Capacity of Aromatic Hydrocarbons in UiO-66 Thin Films" Inorganics 9, no. 1: 1. https://0-doi-org.brum.beds.ac.uk/10.3390/inorganics9010001

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