聚苯胺纳米管改性聚酰胺纳滤膜的制备研究

Preparation of polyaniline nanotubes modified polyamide nanofiltration membrane

针对纳滤膜水通量与选择性相互制约的“trade-off”效应现象,以聚醚砜(PES)超滤膜为支撑层,通过界面聚合制备了聚苯胺纳米管改性的高通量聚酰胺纳滤膜。聚苯胺纳米管的空腔可以在膜内构建更多水通道,促进水分子传递。同时,聚苯胺纳米管可以与均苯三甲酰氯发生反应,形成了较强的共价键,优化填充材料与高分子基质的界面相容性。结果表明,与空白聚酰胺纳滤膜相比,当聚苯胺纳米管填充量为1.5 g·m^(-2)时,纳滤膜水通量由12.5 L·m^(-2)·h^(-1)·bar^(-1)上升至21 L·m^(-2)·h^(-1)·bar^(-1),但对硫酸钠的截留仍然高达94.3%。

In view of the trade-off effect between permeability and selectivity of nanofiltration membrane,the polyaniline nanotubes modified polyamide nanofiltration membrane with enhanced water flux was pre-pared via interfacial polymerization on a polyether sulfone(PES)substrate.The tube structure of polyan-iline could provide more channels for water pass through.The reaction between polyaniline nanotubes and trimesoyl chloride could form strong covalent bonds which was beneficial for the interface compatibility of filler materials with polymer matrix.The results indicated that the membrane prepared with a nanotubes loading of 1.5 g·m^(-2) exhibited an increased water flux form 12.5 L·m^(-2)·h^(-1)·bar^(-1) to 21 L·m^(-2)·h^(-1)·bar^(-1) compared to the polyamide membrane while the rejection to Na_(2)SO_(4) was up to 94.3%.