It is highly challenging to prepare durable and chemical resistant ultra-permeable membranes that can quickly separate small organic molecules like dye or inorganic salt in the complex textile wastewater industry. Here, side-chain sulfonated poly(ether ether ketone) (SPEEK) was synthesized and prepared the poly(ether ether ketone) (PEEK) - SPEEK nanofiltration (NF) membrane by a simple dipping coating and heat treatment. Single component filtration tests of the optimized membrane showed ultrahigh pure water flux (126 Lm⁻² h⁻¹ bar⁻¹) and relatively low NaCl rejection (6.7%). Moreover, the negatively charged membrane exhibited excellent rejection of 98.8% toward Congo red (CR). The pure water flux was about 9 folds than that of commercial NF270 with comparable solutes rejection. The separation tests of CR and NaCl mixed solution at optimized conditions exhibited ultra-high permeation flux (34 Lm⁻² h⁻¹ bar⁻¹), satisfactory dye (98.8%)/salt (< 10%) rejection and the separation performance remained stable after 10 cycles. Finally, the contaminated membrane was washed with ethanol, the permeation flux and the CR rejection remained constant after several cycles, while the commercial NF1 membrane exhibited serious swelling only within one cycle. The prepared membrane exhibited good organic solvents resistance and antifouling properties. Thus, this work confirmed the PEEK-SPEEK NF membrane showed great potential in the sustainable treatment of textile wastewater.

制备耐用且耐化学腐蚀的超渗透膜在复杂的纺织废水行业中能够快速分离出染料或无机盐之类的有机小分子，具有很高的挑战。在此，合成了侧链磺化聚醚醚酮（SPEEK），并通过简单的浸涂和热处理制备了聚醚醚酮（PEEK）-SPEEK纳滤（NF）膜。优化膜的单组分过滤测试显示超高纯水通量（126 Lm ^-2 h ^-1 bar ^-1）和较低的NaCl截留率（6.7％）。此外，带负电的膜对刚果红（CR）表现出极好的98.8％的排斥率。纯水通量是商业NF270的9倍，溶质截留率相当。在最佳条件下进行的CR和NaCl混合溶液的分离测试显示出超高的通量（34 Lm ^-2 h ^-1 bar ^-1），令人满意的染料（98.8％）/盐（<10％）截留率，并且10次循环后分离性能保持稳定。最后，受污染的膜用乙醇洗涤，渗透通量和CR排斥在几个循环后保持恒定，而商用NF1膜仅在一个循环内显示出严重的溶胀。制备的膜表现出良好的耐有机溶剂性和防污性能。因此，这项工作证实了PEEK-SPEEK NF膜在纺织废水的可持续处理中显示出巨大潜力。