Iron(III) based Metal-Organic Frameworks in cellulose acetate film preservation ; Fundamental aspects and first application

Funding Information: This work has received funding from the European Union's Horizon 2020 research and innovation program under grant agreement no. 760801\NEMOSINE . Fundação para a Ciência e a Tecnologia (FCT-MCTES) is acknowledged for the funding to the Projects UIDB/04028/2020 and UIDP/04028/2020 (CERENA) and to the Project UID/QUI/50006/2020 (Associated Laboratory for Sustainable Chemistry−Clean Processes and Technologies, LAQV−REQUIMTE). Publisher Copyright: © 2023 The Authors ; Low-temperature storage to slow down degradation is accepted by the film conservation community. Still, this solution prohibits public access, is price-sensitive, has high energy costs, and there are concerns about their effects on the physical stability and material lifetime. In this research, a smart solution is developed based on the selective capture of acetic acid produced by the cellulose acetate polymer. This innovative approach is based on Metal-Organic Frameworks (MOFs) for acetic acid adsorption, specifically a highly selective porous iron(III) based MOF, MIL-100(Fe), which was synthesized using a green approach. The stability of MIL-100(Fe), under acetic acid exposure, was demonstrated by accelerated aging experiments, with no noticeable changes in crystallinity and/or porosity as deduced from powder X-ray diffraction analysis, infrared spectroscopy, thermogravimetric analysis, nitrogen porosimetry, and electron microscopy. Compatibility tests with the artefacts were performed to prove the safety of the MIL-100(Fe) to the artefacts. A field application in a demonstration prototype (smart box) was performed at Institut Valencià de Cultura. A recently developed hybrid model provided recommendations on the quantity of adsorbents to use in the smart box. Good agreement was observed between the model predictions and the in-field experimental results, which validated the model application. The model predicted that the new adsorbent (5% of the film's weight, replaced every 10 years, at 16°C or 22°C) extends the film's lifetime ...