Abstract In this work, nanofiltration membrane with an asymmetric selective separation layer and improved surface negative charge was designed and fabricated to efficient remove anionic dyes from aqueous solution. Firstly, loose polyester selective separation layer was formed through interfacial polymerization of triethanolamine and trimesoyl chloride. Surface carboxylation was then implemented via esterification using poly(acrylic acid) to generate a dense skin. Membrane characterizations verified the asymmetric structure and enrichment of surface carboxyl group, which endowed the carboxylated membrane with improved perm-selectivity and anti-dye-deposition property to anionic dye aqueous solutions. The desired surface carboxylated membrane exhibited 99.6% methyl blue removal, 8.05 l/m2 h bar steady-state water permeability and 14.3% relative flux decline ratio under 5.0 bar. The water permeability of carboxylated membrane to methyl blue aqueous solution was higher than those of most reported membranes and even at least two times higher than that of the polyester-based membrane having nearly the same dye removal ability. The attractive results indicate that surface carboxylated polyester based thin-film composite membrane is a promising material for high-efficiency nanofiltration of anionic dye aqueous solution. This study provides valuable insights into the construction and fabrication of high performance nanofiltration membrane for efficient treatment of anionic dye aqueous solution.

中文翻译：

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构建高渗透选择性和抗染料沉积性能的薄膜复合膜有效去除阴离子染料

摘要 在这项工作中，设计并制造了具有不对称选择性分离层和改进的表面负电荷的纳滤膜，以有效去除水溶液中的阴离子染料。首先，通过三乙醇胺和均苯三甲酰氯的界面聚合形成松散的聚酯选择性分离层。然后使用聚（丙烯酸）通过酯化来实现表面羧化以产生致密的皮肤。膜表征证实了表面羧基的不对称结构和富集，这使羧化膜对阴离子染料水溶液具有更高的渗透选择性和抗染料沉积性能。所需的表面羧化膜表现出 99.6% 的甲基蓝去除率、8.05 l/m2 h bar 稳态水渗透率和 14。5.0 bar 下 3% 的相对通量下降率。羧化膜对甲基蓝水溶液的透水性高于大多数报道的膜，甚至比具有几乎相同染料去除能力的聚酯基膜高至少两倍。有吸引力的结果表明，表面羧化聚酯基薄膜复合膜是一种用于阴离子染料水溶液高效纳滤的有前途的材料。本研究为高效处理阴离子染料水溶液的高性能纳滤膜的构建和制造提供了宝贵的见解。羧化膜对甲基蓝水溶液的透水性高于大多数报道的膜，甚至比具有几乎相同染料去除能力的聚酯基膜高至少两倍。有吸引力的结果表明，表面羧化聚酯基薄膜复合膜是一种用于阴离子染料水溶液高效纳滤的有前途的材料。本研究为高效处理阴离子染料水溶液的高性能纳滤膜的构建和制造提供了宝贵的见解。羧化膜对甲基蓝水溶液的透水性高于大多数报道的膜，甚至比具有几乎相同染料去除能力的聚酯基膜高至少两倍。有吸引力的结果表明，表面羧化聚酯基薄膜复合膜是一种用于阴离子染料水溶液高效纳滤的有前途的材料。本研究为高效处理阴离子染料水溶液的高性能纳滤膜的构建和制造提供了宝贵的见解。有吸引力的结果表明，表面羧化聚酯基薄膜复合膜是一种用于阴离子染料水溶液高效纳滤的有前途的材料。本研究为高效处理阴离子染料水溶液的高性能纳滤膜的构建和制造提供了宝贵的见解。有吸引力的结果表明，表面羧化聚酯基薄膜复合膜是一种用于阴离子染料水溶液高效纳滤的有前途的材料。本研究为高效处理阴离子染料水溶液的高性能纳滤膜的构建和制造提供了宝贵的见解。