Surface modification of carbon nanotubes is a common method to improve their compatibility with polymer matrix in membranes. In this study, polyethersulfone (PES) nanocomposite membranes were prepared by incorporation of modified multi-walled carbon nanotubes (MWCNT). For this purpose, diallyldimethylammonium chloride was used as a monomer for the functionalization of carboxylated-MWCNT via in situ polymerization. Synthesized polymer possessed a positive charge on repeating unit, which increased the hydrophilicity of carboxylated-MWCNT. The properties and performances of the modified carboxylated-MWCNT and nanocomposite membranes were investigated by field emission scanning electron microscopy, thermogravimetric analysis (TGA), Fourier-transform infrared spectroscopy (FT-IR), contact angle measurement, salt, heavy metal, and dye removal, and fouling studies. The occurrence of the modification reaction was confirmed by FT-IR and TGA studies. Results showed that the incorporation of modified carboxylated-MWCNT into polyethersulfone membranes improved their performance in the separation of salts, heavy metal ions, and dyes. Furthermore, the surface hydrophilicity of membranes was improved by loading of modified carboxylated-MWCNT, and other properties like the pure water flux and anti-fouling resistance of PES membranes were refined remarkably. More importantly, the membranes containing modified additive showed pH sensitivity because of ammonium groups in the attached polymer chain.

中文翻译：

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聚（二烯丙基二甲基氯化铵）接枝羧化多壁碳纳米管作为聚醚砜膜中的添加剂

碳纳米管的表面改性是提高其与膜中聚合物基体相容性的常用方法。在这项研究中，聚醚砜 (PES) 纳米复合膜是通过掺入改性多壁碳纳米管 (MWCNT) 制备的。为此，使用二烯丙基二甲基氯化铵作为单体，通过原位聚合对羧化多壁碳纳米管进行功能化。合成的聚合物在重复单元上带有正电荷，增加了羧化多壁碳纳米管的亲水性。通过场发射扫描电子显微镜、热重分析 (TGA)、傅里叶变换红外光谱 (FT-IR)、接触角测量、盐、重金属和染料研究了改性羧化多壁碳纳米管和纳米复合膜的性质和性能移动，和结垢研究。FT-IR和TGA研究证实了改性反应的发生。结果表明，将改性羧化多壁碳纳米管掺入聚醚砜膜提高了其分离盐类、重金属离子和染料的性能。此外，通过负载改性羧化多壁碳纳米管提高了膜的表面亲水性，并显着改善了PES膜的纯水通量和抗污染性等其他性能。更重要的是，由于连接的聚合物链中的铵基团，含有改性添加剂的膜表现出 pH 敏感性。结果表明，将改性羧化多壁碳纳米管掺入聚醚砜膜提高了其分离盐类、重金属离子和染料的性能。此外，通过负载改性羧化多壁碳纳米管提高了膜的表面亲水性，并显着改善了PES膜的纯水通量和抗污染性等其他性能。更重要的是，由于连接的聚合物链中的铵基团，含有改性添加剂的膜表现出 pH 敏感性。结果表明，将改性羧化多壁碳纳米管掺入聚醚砜膜提高了其分离盐类、重金属离子和染料的性能。此外，通过负载改性羧化多壁碳纳米管提高了膜的表面亲水性，并显着改善了PES膜的纯水通量和抗污染性等其他性能。更重要的是，由于连接的聚合物链中的铵基团，含有改性添加剂的膜表现出 pH 敏感性。