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采用硫酸、硝酸混酸改性多壁碳纳米管(MWCNTs),通过化学水热法在改性的MWCNTs表面负载纳米Fe_3O_4,将负载Fe_3O_4的MWCNTs(MWCNTs/Fe_3O_4)与PVC在无磁场、有磁场作用下共混制膜,获得MWCNTs无序排列、有序排列修饰的PVC超滤膜,同时,制备了纯PVC膜以作比较.对共混膜有序修饰机制及断面形态进行了分析,对相关性能参数如接触角、膜的溶胀、膜孔隙率、膜平均孔径、纯水通量、截留性能及吸附性能等进行了研究.研究结果表明:MWCNTs/Fe_3O_4的加入使膜的亲水性、纯水通量、截留性能等有了显著提高,MWCNTs有序排列修饰使膜在表皮层形成了更加致密,更为狭长的微孔结构,具有了更优异的导流网络通道,在长时间运行条件下仍能保持良好的过滤负荷,提高了膜的性能.
Multi-walled carbon nanotubes (MWCNTs) were modified by sulfuric acid and nitric acid mixed with acid, and the nano-Fe 3 O 4 was loaded on the surface of modified MWCNTs by chemical hydrothermal method. The MWCNTs / MWCNTs / Under the same conditions, pure PVC membrane was prepared for comparison.Moreover, the modification mechanism and cross-section morphology of the blend membrane were analyzed, Performance parameters such as contact angle, membrane swelling, membrane porosity, membrane average pore size, water flux, retention and adsorption properties were studied.The results show that the addition of MWCNTs / Fe 3 O 4 makes the membrane hydrophilic, pure Water flux, retention performance, etc. have been significantly improved MWCNTs orderly arrangement of the membrane in the epidermis to form a more dense, more narrow porous structure, with more excellent diversion network access, long-term operating conditions Still maintain a good filtration load, improve the performance of the membrane.