Functional Metal Organic Framework/SiO2 Nanocomposites: From Versatile Synthesis to Advanced Applications

Abstract

Metal organic frameworks (MOFs), also called porous coordination polymers, have attracted extensive attention as molecular-level organic-inorganic hybrid supramolecular solid materials bridged by metal ions/clusters and organic ligands. Given their advantages, such as their high specific surface area, high porosity, and open active metal sites, MOFs offer great potential for gas storage, adsorption, catalysis, pollute removal, and biomedicine. However, the relatively weak stability and poor mechanical property of most MOFs have limited the practical application of such materials. Recently, the combination of MOFs with inorganic materials has been found to provide a possible strategy to solve such limitations. Silica, which has excellent chemical stability and mechanical properties, shows great advantages in compounding with MOFs to improve their properties and performance. It not only provides structured support for MOF materials but also improves the stability of materials through hydrophobic interaction or covalent bonding. This review summarizes the fabrication strategy, structural characteristics, and applications of MOF/silica composites, focusing on their application in chromatographic column separation, catalysis, biomedicine, and adsorption. The challenges of the application of MOF/SiO2 composites are addressed, and future developments are prospected.

Proton exchange composite membranes comprisingSiO2, sulfonatedSiO2, and metal–organic frameworks loaded inSPEEKpolymer for fuel cell applications

“…In the present work, the SiO 2 , SSiO 2, and MOF‐5 incorporated SPEEK membrane was synthesized to study the synergistic effect of three‐component hybrid membranes 32 . The influence of SSiO 2 nanoparticles and MOF‐5 in terms of thermal and mechanical stability has been explored.…”

Coordination Polymer Frameworks for Next Generation Optoelectronic Devices

“…Since then, the term coordination polymer and metal organic framework have been used interchangeably. The term MOFs was first introduced by Omar Yaghi in 1995 [4,9]. The framework of MOFs is either porous or non-porous.…”

“…However, Further investigations demonstrated that ZnO impurities in the material gave rise to the emission assigned to the quantum dot like luminescence and that pure MOF-5 displays a luminescence behavior that is more closely relevant to that of the ligand. [9] However, the exact nature of the luminescence of MOF-5 is still under dispute with ligand− ligand charge transfer, [10] ligand-centered, [9] and ligand-metal charge transfer [11] mechanisms as primary suggestions.…”

“…The first MOF, MOF-5 or IRMOF-1 (Zn 4 O(BDC) 3 ) reported by Omar M. Yaghi was used in gas adsorption applications accounting to its high surface area of 2900 m 2 /g [5,6]. To date, 80,000 MOFs [7] have been reported owing to its diverse structure, compositions, tunable porosity, specific surface area, [8] ease of functionalization, unsaturated metal sites [9] and biocompatibility [10] . As a result, MOFs were used in a wide range of applications such as gas storage and separation, drug delivery and storage, chemical separation, sensing, catalysis, and bio-imaging [3,7,[11][12][13].…”

Metal Organic Framework@Polysilsesequioxane Core/Shell-Structured Nanoplatform for Drug Delivery

“…In pharmaceutical applications, enhancing the water stability, mechanical strength, and biocompatibility of MOFs while maintaining their other advantages remains a big challenge [23][24][25]. To solve this problem, researchers have attempted to fabricate MOF nanocomposites with other materials, such as polymers, silica, graphene, or carbon nanotubes, which have different properties, as the reinforcement phase [26][27][28][29][30][31][32][33][34][35][36][37][38]. Silica is suitable for preparation of composite materials to improve the performance of MOFs due to its high stability and structural adjustability [39][40][41][42].…”