Abstract Carboxylated cardo poly(arylene ether ketone)s (PAEK-COOH) is a thermally stable and hydrophilic membrane fabrication material. Herein, PAEK-COOH was employed as membrane material, being dissolved in N-methyl-2-pyrrolidone (NMP) and 1,4-dioxane (DO) mixed solvent and activated by adding 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (EDC) and N-hydroxysuccinimide (NHS) to prepare polymer casting solution. Then the activated polymer film was immersed into polyethylenimine (PEI) aqueous solution that served as coagulation bath for taking the one-step chemical reaction-involved phase inversion process. As illustrated by the SEM images, the fabricated crosslinked tight ultrafiltration membrane had a dense and integrally skinned separation skin layer. Chemical composition and hydrophilicity of membrane surface were studied by ATR-FTIR and water contact angle, respectively. Those results revealed that, via the in situ crosslinking of activated carboxylic acid group and PEI along with the phase inversion process, the PEI molecules had been covalently bonded onto membrane surface and resulted in the increase of membrane hydrophilicity. The optimized membrane had a molecular weight cut off (MWCO) of 12.7 kDa and an isoelectric point of 7.4, indicating which is slightly positively charged. The one-step chemical reaction involved phase inversion between reactive macromolecules, i.e., activated PAEK-COOH original polymer film and PEI crosslinker in coagulant, was an efficient and convenient approach for fabrication of highly permeable and selective tight ultrafiltration membranes. Membrane had a dye solution permeability of 80–84 L m−2 h−1 bar−1 and Congo red (CR) rejection of 99.9% in 100 h long-term filtration testing, being capable for dye removal from textile wastewater.

中文翻译：

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活化PAEK-COOH与PEI一步化学反应-涉及转相过程制备的原位表面交联致密超滤膜

摘要 羧化卡多聚亚芳基醚酮 (PAEK-COOH) 是一种热稳定且亲水的膜制造材料。本文以PAEK-COOH为膜材料，溶解于N-甲基-2-吡咯烷酮(NMP)和1,4-二恶烷(DO)混合溶剂中，加入1-(3-二甲氨基丙基)-3-乙基碳二亚胺活化盐酸盐 (EDC) 和 N-羟基琥珀酰亚胺 (NHS) 制备聚合物浇铸溶液。然后将活化的聚合物薄膜浸入作为凝固浴的聚乙烯亚胺（PEI）水溶液中，进行一步化学反应涉及的相转化过程。如 SEM 图像所示，制造的交联紧密超滤膜具有致密且整体结皮的分离表层。分别通过ATR-FTIR和水接触角研究膜表面的化学成分和亲水性。这些结果表明，通过活化的羧酸基团和 PEI 的原位交联以及相转化过程，PEI 分子已共价键合到膜表面，导致膜亲水性增加。优化的膜具有 12.7 kDa 的截留分子量 (MWCO) 和 7.4 的等电点，表明其带轻微正电荷。一步化学反应涉及反应性大分子之间的相转化，即活化的 PAEK-COOH 原始聚合物膜和混凝剂中的 PEI 交联剂，是制造高渗透性和选择性紧密超滤膜的一种有效且方便的方法。