Fe_2O_3-SiO_2复合粒子的制备及其PU共混膜的氧氮分离性能

Preparation of nano-sized Fe_2O_3-SiO_2 composite particles and the O_2/N_2 separation performance of their PU blend membrane

采用共沉淀与复配2种方法制备了Fe2O3-SiO2复合纳米粒子,将其添加到聚氨酯(PU)膜中,研究了粒子复合方式对PU共混膜力学性能和O2、N2分离性能的影响。结果表明,通过共沉淀法制备的Fe2O3-SiO2粒子粒径小且均匀,内部存在硅铁固溶体结构,其PU共混膜的机械强度和氧氮分离性能优于复配法制备的Fe2O3/SiO2粒子;当Fe2O3-SiO2添加量为10%时,PU共混膜的O2渗透系数为13.35 Barrer,O2/N2理论分离因子为7.14。

Nano-sized Fe203-SiO2 composite particles were prepared by coprecipitation method and mixed method. Further PU blend membrane were prepared by blending composite particles with PU and their 02 and N2 permeation properties were investigated. Results showed that Fe203-SiO2 prepared by the co-pre- cipitating method had smaller and more uniform particle size than Fe203/SiO2 prepared by blending Fe2O3 with SiO2. Due to the Si/Fe solid solution structure in F%O3-SiO2 particle, PU/Fe203-SiO2 membrane had better mechanical and oxygen and nitrogen separation properties compared to PU/Fe2OJSiO2 membrane. Meanwhile, at 10% F%O3-SiO2 content, the 02 permeability coefficients of PU/Fe203-SiO2 blend membrane is 13.35 Barter, the ideal selectivity of O2/N2 is 7.14.