高通量自支撑Ni-btc纤维膜用于高效H2/CO2分离OA

In order to prepare self-supporting MOF fiber membranes and study its separation performance for hydrogen/carbon dioxide(H2/CO2).An in situ synthesis method is used to construct linear long-chain molecules through coordination between metal units and organic ligands,and adjacent molecular chains attract each other through hydrogen bonds to prepare MOF fibers(Ni-btc fibers).Driven by pressure,Ni-btc fibers can be further assembled into MOF fiber membranes(Ni-btc fiber membranes).The surface morphology and H2/CO2 separation performance of the samples were evaluated by thermal field emission scanning electron microscopy(SEM),high-resolution transmission electron microscopy(HRTEM)and membrane gas separation performance testing.The results show that the prepared Ni-btc fiber has a high aspect ratio,and the area of the Ni-btc fiber membrane can reach 7 cm2.The H2 permeability coefficient of Ni-btc fiber membrane is 21.8×106 Barrer,and the H2/CO2 separation selectivity is 5.04,exceeding the Robeson upper limit line in 2008.In addition,the Ni-btc fiber membrane has excellent high temperature,high humidity and long-term separation stability properties.This shows that Ni-btc fiber membranes have excellent H2/CO2 separation capabilities and provide the possibility of designing MOF membranes with high permeability coefficients and good separation selectivity.