Synthesis And Adsorption Performance Of Micro/Nanoparticles Of Porous Coordination Polymers

Due to their special inorganic-organic hybrid composition, novel topological structures, and excellent performance, porous coordination polymer received extensive interests. With the development of nano science and technology, nanomaterials of coordination polymer developed rapidely. Thus, it is still a challenge to easily and environment friendly synthesize nano-and micromaterials of coordination polymer. In this paper, we systemly investigated the effects of particle size and morphology for the adsorption performance of porous coordination polymers.1. Synthesis and sorption properties of ZIF-90 micro/nanoparticles.(1) ZIF-90 micropolyhedron was prepared with interface method, the gases uptakes desreased compared to the ZIF-90 crystals (1a). ZIF-90 nanostructure (1b) was prepared in DMF solution, and it displayed mesoporous adsorption character.(2) Different sized ZIF-90 nanospheres were prepared in solventhermal condition through changing the reactants concentration. The sizes of the spheres are various from 5μm to 20 nm, and the gases sorption properties changed with the sizes of the spheres. Insterestingly, the gas uptakes of these microspheres decreases with the decrease of the microphere size.2. Synthesis and sorption properties of MOF-5 micro/nanoparticles.(1) High purity MOF-5 nanocubes (2a) were prepared by diluting (dilute 400 times according to the reference) the reactants concentration in solventhermal condition at 100癈 for 7 h. Through controlling the content of H2O in DMF solution, different sized and shaped nanocubes (2b,2c and 2d) were synthesized. The gases sorption properties of these samples were investigated. Especially, the H2 adsorption heat of 2a increased by 20%, CO2 and CH4 uptakes increased by 5-10%compared with the results of MOF-5 crystal.(2) At room temperature, MOF-5 nanoparticles (2e) were also prepared at the DMF/hexane interface with the assistance of triethlyamine (TEA). Through controlling the addition of water into the reaction system, we get different morphological particles (2f,2g,2h), in turn. Surface area of all the samples were decreased from 2e to 2f to 2g to 2h.3. Synthesis and sorption properties of BDC-based coordination polymer micro/nanoparticles.Series of metal coordination polymer nanoparticles based on Cu(NO3)2'3H2O, Cr(NO3)2-9H2O, Pb(NO3)2, Co(NO3)2-6H2O, Cd(NO3)2-4H2O, Ni(NO3)2-6H2O and H2BDC were formed at the DMF/hexane interface. The surface areas of all the nanoparticles were measured, and CO2 and CH4 sorption properties of 3a and 3b were investigated. Especially,3b has higher H2 adsorption heat and higher CO2 and H2 uptakes.'...