| Forward osmosis membrane（FO）has the advantages of low energy consumption and high recovery.It can be applied in the field of seawater desalination to solve the shortage of fresh water resources.However,the application of FO is restricted by the inner concentration polarization（ICP）and membrane contamination.Therefore,it is of great significance to improve the structure and performance of forward osmosis membranes modified by nanoparticle.In this study,high performance hybrid matrix forward osmosis membranes were prepared by modifying the basic cellulose acetate（CA）forward osmosis membranes using nanomaterials with high hydrophilicity and high porosity.MOFs material MIL-53（Al）was successfully synthesized by hydrothermal method and tested for structural characterization by XRD,FTIR,SEM and N2 adsorption and desorption.MIL-53（Al）was used as a blend additive to prepare the CA/MIL-53（Al）mixed matrix FO membrane.The effects of MIL-53（Al）content,mixing temperature,coagulation bath temperature and pore-causing agent content on the properties of the mixed matrix membrane were investigated.The optimal preparation conditions were determined,and the mixed matrix FO membrane with high performance was prepared.Under the optimal preparation conditions,the mixed matrix membrane was characterized by FTIR,SEM,AFM and contact angle.In addition,the properties of basic CA membrane and CA/MIL-53（Al）mixed matrix membrane were tested and compared.The experimental results showed that the addition of MIL-53（Al）improved the structure,water flux and salt intercepting effect of the FO.MOFs material MOF-808（Zr）was successfully synthesized by hydrothermal method and tested for structural characterization by XRD,FTIR,SEM and N2 adsorption and desorption.MOF-808（Zr）was used as a blend additive to prepare the CA/MOF-808（Zr）mixed matrix FO membrane.The effects of MOF-808（Zr）content,mixing temperature,coagulation bath temperature and pore-causing agent content on the properties of the mixed matrix FO membrane were investigated.The optimal preparation conditions were determined.Under the optimal preparation conditions,the CA membrane and CA/MOF-808（Zr）mixed matrix membrane were characterized by FTIR,SEM,AFM and contact angle.In addition,the properties of basic CA membrane and CA/MOF-808（Zr）mixed matrix membrane were tested and compared.The experimental results showed that the addition of MOF-808（Zr）improved the structure,water flux and salt intercepting effect of the FO membrane.MIL-53（Al）@MOF-808（Zr）composite material was successfully synthesized by hydrothermal method and characterized by XRD,FTIR,SEM and N2 adsorption and desorption.The composite material MIL-53（Al）@MOF-808（Zr）was added into the casting liquid to modify the FO membrane.The influences of the content of MIL-53（Al）@MOF-808（Zr）,mixing temperature,the coagulation bath temperature and the pore-causing agent content on the properties of the membrane were discussed,so as to determine the optimal preparation conditions.Under the optimal preparation conditions,the CA membrane and CA/MIL-53（Al）@MOF-808（Zr）mixed matrix membrane were characterized by FTIR,SEM,AFM and contact angle.Moreover,the properties of CA membrane and CA/MIL-53（Al）@MOF-808（Zr）mixed matrix membrane were analyzed and tested.The experimental results showed that the addition of MIL-53（Al）@MOF-808（Zr）composite material increased the water flux of the mixed matrix FO membrane,and improved the separation and permeability of the membrane.The seawater desalination experiments of CA/MIL-53（Al）,CA/MOF-808（Zr）,CA/MIL-53（Al）@MOF-808（Zr）mixed matrix membranes,basic CA membranes and HTI commercial membranes prepared under the optimal preparation conditions were carried out.The experimental results showed that the water flux and salt intercepting rate of the three modified mixed matrix membranes are significantly improved,and the mixed matrix membrane modified by MIL-53（Al）@MOF-808（Zr）has better performance than that modified by MIL-53（Al）and MOF-808（Zr）. |
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