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    Solvent-exchange process in MOF ultrathin films and its effect on CO2 and methanol adsorption

    Year: 2021

    Journal: J. Colloid Interface Sci., Volume 590, MAY 15, page 72–81

    Authors: Andres, M. A.; Fontaine, P.; Goldmann, M.; Serre, C.; Roubeau, O.; Gascon, I

    Organizations: European Union Seventh Framework Programme (FP7/2007-2013) [608490]; Spanish MINECO; Spanish FEDER [MAT2016-78257-R, MAT2017-86826-R]; Aragon Government (DGA); FEDER [E31_17R]; University of Zaragoza [JIUZ-2015-CIE-02]; Ministerio de Educacion from the Spanish Government under a FPU grant (Formacion de Profesorado Universitario) [FPU14/05367]; SOLEIL synchrotron [20160935, 20180164]

    Keywords: Metal organic framework (MOF); MIL-96(Al); Nanoparticles (NPs); Langmuir and Langmuir-Blodgett (LB) films; Quartz crystal microbalance (QCM); Adsorption studies; CO2 adsorption; VOC adsorption; Synchrotron characterization

    Metal-organic framework (MOF) activation is crucial for the use of MOFs in several applications and solvent-exchange process is a necessary step in many activation methods. In this contribution, we have explored in situ MOF monolayer film formation at the air-water interface. Nanoparticles (NPs) of the Al trimesate MIL-96(Al) retain chloroform into their micropores, which considerably diminishes the CO2 adsorption capacity of MOF films. However, a solvent-exchange process between chloroform and water increases CO2 film adsorption capacity by 30%. Total Reflection X-Ray Fluorescence (TRXF) allows studying the kinetics of this process at the air-water interface, that strongly depends on the NP size. The conclusions derived from in situ studies allow optimizing the ex situ activation procedure of MIL-96(Al) films deposited onto quartz crystal microbalance (QCM) substrates in order to maximize CO2 and methanol adsorption. (C) 2021 Elsevier Inc. All rights reserved.
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