TY - JOUR

T1 - The impact of framework flexibility and defects on the water adsorption in CAU-10-H

AU - Grenev, Ivan V.

AU - Shubin, Aleksandr A.

AU - Solovyeva, Marina V.

AU - Gordeeva, Larisa G.

N1 - Funding Information: The authors are grateful to the Siberian Supercomputer Center and Supercomputing Center of the Novosibirsk State University for providing supercomputer equipment. The reported study was supported by the Russian Foundation for Basic Research, projects number 19-33-60087 and 18-29-04033. Publisher Copyright: © 2021 the Owner Societies.

PY - 2021/10/7

Y1 - 2021/10/7

N2 - Aluminum-based metal-organic framework (MOF) CAU-10-H is a promising candidate for heat transformation and water harvesting applications due to its hydrothermal stability, beneficial step-wise water adsorption isotherm and low toxicity. In this study, the effects of the framework flexibility and structural defects on the mechanism of water sorption in CAU-10-H were studied by grand canonical Monte Carlo (GCMC) methods. It was shown by the simulations that the rigid ideal MOF framework is hydrophobic. The account of the linker "flapping"motion during the simulations made the framework more hydrophilic due to unblocking of hydroxyl groups that are inaccessible to water molecules for the rigid structure model. However, this model cannot predict the experimental pressure, at which the step on the adsorption isotherm is observed. Based on this result, we suggested that the presence of structural defects could increase the MOF hydrophilicity. The investigation of the water adsorption using several models of defective structures demonstrated that even a small number of defects shift the calculated position of the step on the adsorption isotherm towards the experimental values. The results obtained in this study emphasize that the controlled synthesis of defective structures is one of the most efficient methods of regulating the MOF adsorption properties.

AB - Aluminum-based metal-organic framework (MOF) CAU-10-H is a promising candidate for heat transformation and water harvesting applications due to its hydrothermal stability, beneficial step-wise water adsorption isotherm and low toxicity. In this study, the effects of the framework flexibility and structural defects on the mechanism of water sorption in CAU-10-H were studied by grand canonical Monte Carlo (GCMC) methods. It was shown by the simulations that the rigid ideal MOF framework is hydrophobic. The account of the linker "flapping"motion during the simulations made the framework more hydrophilic due to unblocking of hydroxyl groups that are inaccessible to water molecules for the rigid structure model. However, this model cannot predict the experimental pressure, at which the step on the adsorption isotherm is observed. Based on this result, we suggested that the presence of structural defects could increase the MOF hydrophilicity. The investigation of the water adsorption using several models of defective structures demonstrated that even a small number of defects shift the calculated position of the step on the adsorption isotherm towards the experimental values. The results obtained in this study emphasize that the controlled synthesis of defective structures is one of the most efficient methods of regulating the MOF adsorption properties.

UR - http://www.scopus.com/inward/record.url?scp=85116533119&partnerID=8YFLogxK

U2 - 10.1039/d1cp03242a

DO - 10.1039/d1cp03242a

M3 - Article

C2 - 34545867

AN - SCOPUS:85116533119

VL - 23

SP - 21329

EP - 21337

JO - Physical Chemistry Chemical Physics

JF - Physical Chemistry Chemical Physics

SN - 1463-9076

IS - 37

ER -