聚醚砜/改性UiO66共混超滤膜的制备与性能

Preparation and properties of polyether sulfone/modified UiO66 blended ultrafiltration membrane

摘要:

为了改善UiO66粒子与聚醚砜（PES）共混超滤膜抗污染能力差，粒子与膜的相互作用弱的缺陷，本文通过更换配体在UiO66上引入氨基和聚吡咯烷酮（PVP），以溶剂热法制备了UiO66-NH2和PVP-UiO66-NH2粒子，与PES共混后，通过相转化法制备超滤膜。考察了基于UiO66的不同种类及含量的粒子对PES超滤膜的纯水通量、截留率、抗污染能力、长期稳定性、亲水性、力学性能等影响。结果表明：当PVP-UiO66-NH2的质量分数为2.5%时，在1bar的测试压力下，与原膜相比，水通量提高了一倍多，达到了506.9L/(m2·h)，拉伸强度约为3.06 MPa，牛血清蛋白（BSA）污染后经过简单的水冲洗，通量恢复率达到了95.97%，长期过滤一段时间水通量能维持在300L/(m2·h)左右。得到的新型超滤膜纯水通量提高的同时，还具有优异的抗污染能力和稳定性，具有较高的应用前景。

Abstract:

In order to improve the defects of the ultrafiltration membrane prepared by blending UiO66 particles with polyether sulfone (PES), such as poor anti-fouling ability and weak interaction between particles and membrane, a novel ultrafiltration membrane was obtained by phase inversion of PES polymer dopes containing modified UiO66 particles. The modified UiO66 particles (UiO66-NH2 and PVP-UiO66-NH2) was obtained by solvothermal method through introducing amino groups and polypyrrolidone (PVP) onto UiO66 by replacing ligands. The effects of types and contents of particles on pure water flux, retention rate, anti-fouling ability, long-term stability, hydrophilicity and mechanical properties of PES blending ultrafiltration membranes were investigated. The results show that the water flux of the blending membrane with 2.5 wt% PVP-UiO66-NH2 reaches to 506.9 L/(m2·h), which is doubled compared to the original membrane. The tensile strength is about 3.06 MPa, and the flux recovery rate is 95.97% after simple water washing after BSA contamination. The water flux can be maintained at about 300 L/(m2·h) for long-term filtration. The novel ultrafiltration membrane not only has enhanced pure water flux, but also has excellent anti-fouling ability and stability, suggesting a high application prospect.