Size And Morphology Controllable NH₂-MIL-53（Al） Crystals And Their Application

In the recent years, metal organic frameworks (MOFs) have been developed to be a hot topic in the research area of materials, which was mainly contributed from its highly developed pore structures, various structures and highly tunable physicochemical properties. As a result, MOFs have shown great promise for a number of diverse applications, such as catalysis, gas adsorption and separation, and nonlinear optics. However, nanoscale MOFs (NMOFs) enjoying many obvious advantages when compared with the traditional bulk crystal of MOFs. For example, the bulk crystal of MOFs needs to be scaled down to nanoscale when they are used to deliver drugs or for biomedical imaging.In this thesis, we proposed a new way to synthesize NH2-MIL-53(Al)crystals with different size and shape based on the previous research works, and then use it to fabricate silver nanoparticles with controllable particle size and uniform distribution. The main research results are as follows:1) We present here a simple solvothermal method to fabricate NH2-MIL-53(Al) crystals with controllable size and morphology just by altering the ratio of water in the DMF-water mixed solvent system without the addition of any surfactants or capping agents.2) We obtained a kind of NH2-MIL-53(Al) crystal with very high BET surface areas (1882m2/g), which broaden its application in gas adsorption and postsynthetic modification. In addition, we prepared a class of NH2-MIL-53(Al) crystals with high crystallinity as well as high yield.3) We successfully grafted thiol group on the framework of NH2-MIL-53(Al) and obtained HS-MIL-53(Al) by postsynthetic modification.4) By using HS-MIL-53(A1) to adsorb Ag+ions, and then restore them to metallic silver, we could fabricate silver nanoparticles contain in MOFs’pores. Moreover, the particle size of silver nanoparticles can be tuned through changing the amount of silver ions being adsorbed.5) We are trying to combine the research works of NMOFs and metal nanoparticles that using MOFs as carriers (Metals@MOFs) to fabricate metal nanoparticles within various kinds of pore structures of NMOFs (Metals@NMOFs), which should have very high catalytic activity.