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 12.7kDa 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 80–84Lm⁻² h⁻¹ bar⁻¹ and Congo red (CR) rejection of 99.9% in 100h 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的一步化学反应-相转化工艺制备原位表面交联致密超滤膜

羧基化的cardo聚（亚芳基醚酮）（PAEK-COOH）是一种热稳定且亲水的膜制造材料。在此，将PAEK-COOH用作膜材料，将其溶解在N-甲基-2-吡咯烷酮（NMP）和1，4-二恶烷（DO）混合溶剂中，并通过添加1-（3-二甲基氨基丙基）-3-乙基碳二亚胺来活化。用盐酸（EDC）和N-羟基琥珀酰亚胺（NHS）制备聚合物浇铸液。然后，将活化的聚合物膜浸入用作凝结浴的聚乙烯亚胺（PEI）水溶液中，以进行一步化学反应相关的相转化过程。如通过SEM图像所示，所制造的交联的紧密超滤膜具有致密且整体皮肤化的分离表皮层。通过ATR-FTIR和水接触角分别研究了膜表面的化学组成和亲水性。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分子已经共价键合到膜表面上，并导致膜亲水性的增加。优化的膜的截留分子量（MWCO）为12.7kDa，等电点为7.4，表明其略带正电荷。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原始聚合物膜和凝结剂中的PEI交联剂，是一种高效且方便的方法，用于制备高渗透性和选择性的紧密超滤膜。在100h长期过滤测试中，^-2 h ^-1 bar ^-1和刚果红（CR）排斥率为99.9％，能够从纺织废水中去除染料。