Metal organic frameworks (MOFs) are a class of compounds that consists of metal ions and organic molecules that are linked together forming porous crystalline solid networks. Nowadays, these materials aroused massive attention among the scientific community due to the considerable promising applications in various fields such as gas adsorption and separation, CO₂ capturing, hydrogen and methane storage, water sorption, biomedical applications, etc.^[1] Moreover, MOF hybrid structures development is drastically accelerating producing gigantic surface areas, different functionalities, and improved physical and chemical properties.^[2] Nevertheless, these compounds showed high sensitivity when exposed to aqueous environment which may render the exploration of these compounds as effective heterogeneous catalysts.^[3] Thus, further studies should be conducted in terms of design and optimized synthesis strategies of these materials to enhance their hydrolytic stability, cost, environmental impact, and sustainability towards potential industrial applications.^[4] This work comprehensively investigates the robustness of MIL-88A experimentally. Stability experiments of these compounds were conducted in terms of chemical, thermal, hydrolytic, and mechanical rigidity. Different conditions as pH, temperature, soaking time in water and milling time, were controlled to meticulously understand the behavior of MIL-88A. The synthesis of this material was conducted in accordance with reported procedure under autogenous pressure.^[5] Different characterization techniques were employed to study the crystallinity and the textural properties of MIL-88A such as XRD, SEM, TEM, BET, FTIR and UV-VIS DRS. Iron-based MIL-88A MOFs are designated as soft, porous crystalline materials and flexible MOFs. In other words, this class of MOFs can have structural transformations as crystal to crystal or crystal to relatively amorphous phase transitions as confirmed by the XRD patterns. Hence, understanding the unusual flexibility and the mechanism of these transitions of MIL-88A is assessed in this study. The detailed results of stability in terms of chemical, thermal, mechanical, and hydrolytic stability will be elaborated and showcased.

[1] A. J. Howarth, Y. Liu, P. Li, Z. Li, T. C. Wang, J. T. Hupp and O. K. Farha, Nature Reviews Materials 2016, 1, 15018.

[2] B. Liu, K. Vikrant, K.-H. Kim, V. Kumar and S. K. Kailasa, Environmental Science: Nano 2020, 7, 1319-1347.

[3] B. S. Gelfand and G. K. H. Shimizu, Dalton Transactions 2016, 45, 3668-3678.

[4] M. Ding, X. Cai and H.-L. Jiang, Chemical Science 2019, 10, 10209-10230.

[5] T. Chalati, P. Horcajada, R. Gref, P. Couvreur and C. Serre, Journal of Materials Chemistry 2011, 21, 2220-2227.

Conference Title

XXVII CONGRESSO NAZIONALE SCI

Conference Country

Italy

Conference Date

May 1, 2021 - Jan. 6, 2021

Conference Sponsor

https://www.soc.chim.it/it/node/2473

Additional Info

Conference Website