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

M A Andrés; P Fontaine; M Goldmann; C Serre; O Roubeau; I Gascón

doi:10.1016/j.jcis.2021.01.030

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

J Colloid Interface Sci. 2021 May 15:590:72-81. doi: 10.1016/j.jcis.2021.01.030. Epub 2021 Jan 16.

Authors

M A Andrés¹, P Fontaine², M Goldmann³, C Serre⁴, O Roubeau⁵, I Gascón⁶

Affiliations

¹ Departamento de Química Física, Facultad de Ciencias, Universidad de Zaragoza, 50009 Zaragoza, Spain; Instituto de Nanociencia y Materiales de Aragón (INMA), CSIC and Universidad de Zaragoza, 50009 Zaragoza, Spain.
² Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin, BP 48, 91192 Gif-sur-Yvette, France.
³ Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin, BP 48, 91192 Gif-sur-Yvette, France; Institut des NanoSciences de Paris, UMR 7588 CNRS, Sorbonne Université, 4 place Jussieu, 75252 Paris Cedex 05, France.
⁴ Institut des Matériaux Poreux de Paris, FRE 2000 CNRS Ecole Normale Supérieure de Paris, Ecole Supérieure de Physique et de Chimie Industrielles de Paris, PSL Research University, 75005 Paris, France.
⁵ Instituto de Nanociencia y Materiales de Aragón (INMA), CSIC and Universidad de Zaragoza, 50009 Zaragoza, Spain.
⁶ Departamento de Química Física, Facultad de Ciencias, Universidad de Zaragoza, 50009 Zaragoza, Spain; Instituto de Nanociencia y Materiales de Aragón (INMA), CSIC and Universidad de Zaragoza, 50009 Zaragoza, Spain. Electronic address: igascon@unizar.es.

PMID: 33524722
DOI: 10.1016/j.jcis.2021.01.030

Abstract

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.

Keywords: Adsorption studies; CO(2) adsorption; Langmuir and Langmuir-Blodgett (LB) films; MIL-96(Al); Metal organic framework (MOF); Nanoparticles (NPs); Quartz crystal microbalance (QCM); Synchrotron characterization; VOC adsorption.