Abstract:

As a new membrane separation technology, organic solvent nanofiltration (OSN) has been widely used in medical and chemical industries. However, the common nanofiltration membranes do not have good solvent resistance, so the selection of suitable membrane materials is the key to the industrial application of organic solvent nanofiltration. Using piperazine (PIP) as an aqueous monomer and TMC as an organic monomer, PA/PEEK composite nanofiltration membranes with good solvent resistance were prepared by interfacial polymerization. The microstructure and hydrophilicity of the membranes were studied. The microstructure and hydrophilicity of the membrane were also studied. The effect of PIP concentration on the permeation separation performance of the composite membranes was investigated, and the flux of various organic solvents and the retention performance of low salt ions and small molecule organic compounds were tested for the membranes with the best performance. The results showed that the membranes prepared with 0.3%(weight fraction) PIP concentration had the best permeation separation performance. The water flux reached (4.81±0.04)L/(h·m²·bar)(1bar=10⁵Pa) and the retention rate of Na₂SO₄ was 98.23%. The flux of the composite film to methanol solvent reached (2.77±0.22)L/(h·m²·bar) and the retained molecular weight in ethanol solvent was about 519g/mol. In addition, the composite membrane exhibited stable long-term organic solvent nanofiltration performance.

Key words: poly ether ether ketone, polyamide, organic solvent nanofiltration, composite materials, membrane, permeate

摘要：

有机溶剂纳滤（OSN）作为一种新兴的膜分离技术在医药化工等领域得到广泛应用。然而常见的纳滤膜不具备良好的耐溶剂性能，因此选择适合的膜材料是有机溶剂纳滤工业应用的关键。以哌嗪（PIP）为水相单体，均苯三甲酰氯（TMC）为油相单体，通过界面聚合法在聚醚醚酮（PEEK）多孔膜上负载了聚酰胺（PA）功能层，制备了良好耐溶剂性能的PA/PEEK复合纳滤膜，并对其微观结构、亲水性能等进行了研究。探究了PIP浓度对复合膜渗透分离性能的影响，并对性能最优异的膜进行了多种有机溶剂的通量测试以及低价盐离子和小分子有机物截留性能测试。结果表明，0.3%（质量分数）PIP浓度制备的膜具有最优渗透分离性能，其水通量达到(4.81±0.04)L/(h·m²·bar)（1bar=10⁵Pa），Na₂SO₄截留率为98.23%；复合膜对甲醇溶剂通量达到(2.77±0.22)L/(h·m²·bar)，在乙醇溶剂中的截留分子量约为519g/mol。此外，复合膜表现出稳定的长期有机溶剂纳滤性能。

关键词: 聚醚醚酮, 聚酰胺, 有机溶剂纳滤, 复合材料, 膜, 渗透