Shaping MOF oxime oxidation catalysts as three-dimensional porous aerogels through structure-directing growth inside chitosan microspheres

Abstract

Metal-organic frameworks stand as unique building-blocks, bridging the gap between coordination chemistry and materials science. While significant advance has been made in their design, current efforts focus on expanding their...

Enhanced Gas Adsorption in HKUST-1@Chitosan Aerogels, Cryogels, and Xerogels: An Evaluation Study

“…This observation further supports the feasibility of creating porous aerogels, which can be achieved through hydrogel swelling or by modifying the hydrogen bonding between adjacent biopolymer fibrillar chains. These alterations likely occur during the solvent exchange or removal process, which is a crucial step in drying polysaccharides . Additionally, in HKUST-1@CS 1:1 C , a macroscopic porosity was observed (Figures d and S4), which can be attributed to the formation of ice crystals.…”

“…Our previous work involved the templating of microporous MOFs inside porous chitosan microspheres to create MOF@CS aerogel composites with hierarchical micro-, meso-, and macroporous networks using a supercritical CO 2 drying process. 13 However, further research is necessary to systematically investigate the impact of various parameters on the gas capture performance of MOF@CS composites, as well as to apply this strategy to better-performing MOFs such as HKUST-1. HKUST-1 (Cu(II) benzene-1,3,5-tricarboxylate) is still considered to be one of the most promising adsorbents for CO 2 capture due to its high surface area, simple and low-cost synthesis, and high density of adsorption sites.…”

The solvent-free mechano-chemical grinding of a bifunctional P25–graphene oxide adsorbent–photocatalyst and its configuration as porous beads

“…We have previously used chitosan as a mould to grow and shape more sophisticated objects, including metal oxide clusters, 26 metal nanoparticles, 28 clay and graphene sheets, 29 and metal–organic frameworks. 30 We consequently attempted to shape binary TiO 2 @GO within singular microspheres. Interestingly, regular porous beads could be obtained using different ratios of chitosan with respect to TiO 2 @GO-45 : 55, showing that the powder does not alter the gelation memory of the polysaccharide.…”

Review and Perspectives of Monolithic Metal–Organic Frameworks: Toward Industrial Applications

“…Thus, monolithic MOF composites were successfully prepared with the assistance of scCO 2 . 74 ZIF-8, ZIF-67, and Fe-BTC 75 MOFs were used the scCO 2 drying method to form monolithic MOFs or composite materials (Table 1). The experimental results indicated that scCO 2 drying not only preserves the pore structure of MOFs but also maintains the integrity of the block, confirming the advantages of supercritical drying.…”