What is MOFs?

In the past two decades, metal organic framework (MOFs) materials have attracted widespread attention from academia and industry as emerging functional materials. MOFs materials are obtained by self-assembly of metal ions and organic ligands. They not only have a crystalline structure with regular pores similar to zeolite molecular sieves, but also have a higher specific surface area than traditional porous materials. Due to the presence of organic components, they are also designed, tailorable, adjustable in pore size, and easy to functionalize the pore surface.

MOFs are considered to be a class of materials with great potential for size screening catalysis, among which hollow MOF materials have attracted particular attention recently. This is because the encapsulation of catalytically active nanomaterials in hollow MOFs can not only use the uniform pores of MOFs to achieve size screening catalysis and protect the catalyst, but also the ultra-thin shell can ensure the rapid diffusion of reactant and product molecules and improve the kinetics of catalytic reactions.

Advantages of 2,5-dihydroxyterephthalic acid in MOF Materials

Currently, there are a large number of MOFs available for CO2 capture, including NU-1000, MIL-101, HKUST-1, UiO-66, ZIF-8, MOF-505 and M-MOF-74 (M/DOBOC) [3]. Among the available single-metal MOF materials, Mg/DOBOC MOF exhibits good affinity for CO2 due to its open metal sites

2,5-Dihydroxyterephthalic acid (DOBDC) can be used to synthesize the MOF core. Due to its specific chemical structure, DOBDC is susceptible to controllable etching by nitric acid (HNO3) and reactive oxygen species (ROS), corroding the MOF core from the inside out or from the outside in to obtain hollow single-crystalline MOF particles with consistent morphology and almost no defects, gaps and grain boundaries. Therefore, the ultra-small pores of the MOF shell can be used to achieve perfect size-selective catalysis.

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