We report a novel high-flux nanofiltration (NF) membrane for the precise separation of dyes and salts, which was fabricated using polysulfone-block-polyethylene glycol (PSf-b-PEG) block copolymer through the non-solvent induced phase separation (NIPS) method. The PSf-b-PEG membrane exhibited a very dense sponge-like porous structure with rich interconnected pores, contributing to its superior mechanical strength of 22.4±0.9 MPa. The pore size of PSf-b-PEG membrane was mostly distributed around 1.3 nm in diameter with the mean effective pore size of 3.8 nm in diameter, while the membrane molecular weight cut off (MWCO) towards dyes was about 655 Da. The PSf-b-PEG membrane exhibited a very high water permeance of 49.3±0.9 L m⁻² h⁻¹ bar⁻¹ and a precise separation of salts and dyes with high above 98% Congo Red dye rejection and nearly 100% Na₂SO₄ passage, succeeding the separation performances of current NF membranes used for the separation of dyes and salts. Long-term NF tests prove the highly stable and outstanding separation performances of PSf-b-PEG membrane with the top dense skin layer as the effective selective layer. Our work suggests that the PSf-b-PEG membrane has a great potential to be further optimized and used for practical applications.

我们报告了一种新型的用于精确分离染料和盐的高通量纳滤（NF）膜，该膜是使用聚砜嵌段-聚乙二醇（PSf- b -PEG）嵌段共聚物通过非溶剂诱导的相分离（NIPS）制造的） 方法。PSf- b -PEG膜表现出非常致密的海绵状多孔结构，具有丰富的相互连通的孔，有助于其22.4±0.9 MPa的优异机械强度。PSf- b -PEG膜的孔径主要分布在直径1.3 nm附近，平均有效孔径为3.8 nm，而膜的染料截留分子量（MWCO）约为655 Da。该PSf- b-PEG膜显示出49.3±0.9 L M非常高的水渗透性^{- 2} ħ ^{- 1}巴^{- 1}及其盐和染料具有高精确分离98％以上刚果红染料排斥和接近100％的Na ₂ SO ₄通道，继承了目前用于分离染料和盐的NF膜的分离性能。长期NF试验证明PSf-的高度稳定和出色的分离性能b -PEG膜与顶部致密皮层作为有效选择性层。我们的工作表明PSf- b -PEG膜具有巨大的潜力，可以进一步优化并用于实际应用。