改性Silicalite-1填充聚酰胺反渗透复合膜的研究

Study of polyamide composite reverse osmosis membrane filled with modified Silicalite-1

为改善分子筛Silicalite-1与聚酰胺(PA)之间的相容性,减少膜内非选择性的缺陷,采用双酚A型环氧树脂(BE188)对分子筛纳米颗粒表面进行改性,并将其添加到PA层中制备分子筛杂化膜。TEM表征结果证明:分子筛经表面改性后,不但提高了在PA基质中的分散性,而且与PA基质之间的相容性也明显改善,从而减少了界面缺陷。将所制备的膜用于2 g/L氯化钠水溶液反渗透脱盐,发现改性分子筛杂化膜的分离性能优于未改性分子筛杂化膜。且当改性分子筛的添加量为1 mg/mL时,膜的水通量为38.72 L/(m2.h),约为PA膜的1.5倍,同时膜的截留率也有所提高。

In order to improve the compatibility between Silicalite-1 zeolite and polyamide （PA）, and reduce the non-selective defect in membrane, the surface of zeolite nanoparticles was modified by bisphenol-A epoxy resin with commercial code BE188 （epoxy equivalent weight, EEW = 188 ） , and the modified zeolite was added into PA layer to make hybrid membrane. TEM characterization shows that after modification the dispersion degree of zeolite in PA matrix increases, and the compatibility between them improves, thus reducing the interface defect. The membrane prepared was used for reverse osmosis desalination with 2 g/L NaCI aqueous solution. The separation performance of hybrid membrane filled with modified zeolite is better than the one filled with original zeolite. When the loading of modified zeolite is 1 mg/mL, the water flux of membrane is 38.72 L/（ m^2·h）, which is about 1.5 times as much as that of PA membrane, and the removal rating improves as well.