Fabriation Of Uio-66/tr(?)ger’s Base Nanocomposite Membrane And Study On Quaternization Of Tr(?)ger’s Base

There is a great deal of fossil fuel consumption in industrial production that produces CO2,which is the main cause of the greenhouse effect.The emission of CO2 will cause global warming that needs to be urgently resolved.Membrane separation technology can be applied to the field of CO2 separation due to its advantages of low energy consumption and environmental-friendly.Mixed matrix membranes are made from dispersed nanomaterials and polymer matrix which combines the advantages of high separation performance of inorganic nanomaterials and excellent mechanical properties of polymer matrix.Metal Organic Frameworks(MOFs)are inorganic nanomaterials with regular pore structure.Compared with traditional inorganic materials,MOF materials are structurally easy to be functionalized and controlled and have significant advantages to fabricate mixed matrix membrane.In this paper,two MOF materials UiO-66 and UiO-66-NH2 were prepared by the traditional solvothermal method and its structures were characterized by wide-angle diffraction(XRD),thermogravimetric analyze(TGA),adsorption-desorption(BET),etc.It has the characteristics of regular microporous structure,good chemical stability,high specific surface area and so on.The structure of the mixed matrix film was characterized by scanning electron microscope(SEM)and infrared spectrum(FTIR).The influence of the doping amount of UiO-66 and UiO-66-NH2 on the gas separation performance of the mixed matrix membrane was studied.The loading of UiO-66 caused the increment of the permeability but a decrement of the selectivity of the mixed matrix membrane.When the doping amount of UIO-66 reaches 50%,its CO2 permeability is about 13 times to the DMBPTB membrane,and its CO2/CH4 and O2/N2 selectivity was reduced by 26.4%and 18%,respectively.The amine-functionalized UiO-66-NH2 nanoparticles have a higher CO2 affinity than UiO-66 and plays a significant role in enhancing the dispersion of nanoparticle in polymer matrix.Compared with For UiO-66-NH2/DMBPTB mixed matrix membranes,its CO2/CH4 selectivity reached 17.95 when the doping amount was 30%,and the CO2 permeability was 743.7 Barrer.In this paper,the quaternization modification of Tr(?)ger’s Base substrate was also studied by reacting the polymer with monoalkylating reagents and dihaloalkylating reagents.The monohaloalkylation with different chain length destroys the close packing of polymer molecular chains.Through n-C4H9I quaternization modification,the permeability of CO2 and O2 reach 274.2 Barrer and 61.7 Barrer,respectively.Compared with the pure membrane,the permeability is increased by 54.5%and 40%,and the selectivity of CO2/CH4 and O2/N2 was increased by 25.4%and 14.7%,respectively.1,4-Diiodobutane was used as the dihalogenated alkylating agent to fabricate cross-linked structure between the polymer chain.Due to the tighter packing between the molecular chains,the CO2 permeability decreased to 44.7%compared with the DMBPTB pure membrane,and the selectivity of CO2/CH4 was increased by 57.6%.