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首页> 外文期刊>RSC Advances >Development of high-performance mixed matrix reverse osmosis membranes by incorporating aminosilane-modified hydrotalcite
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Development of high-performance mixed matrix reverse osmosis membranes by incorporating aminosilane-modified hydrotalcite

机译：通过掺入氨基硅烷改性的水滑石，高效混合基质反渗透膜的研制

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摘要

Thin film nanocomposite (TFN) reverse osmosis (RO) membranes were prepared by dispersing 3-aminopropyltriethoxysilane (APTES) modified hydrotalcite (HT), designated as A-HT, in aqueous solution and incorporating the nanoparticles in polyamide layers during the interfacial polymerization process. Results of Fourier transform infrared spectroscopy and zeta potential characterization showed the successful modification of nanoparticles by APTES. In addition, Fourier transform infrared spectroscopy suggested that amidation would take place between the aminosilane on APTES and trimesoyl chloride in organic solution, providing firm covalent interaction between the nanoparticles and polyamide matrix. Dynamic light scattering and transmission electron microscopy indicated that aminosilane modification improved dispersibility of the nanoparticles in aqueous solution and obtained membranes, which suppressed the aggregation. Both the covalent interaction and aggregation suppression were beneficial to compatibility between nanoparticles and the polyamide matrix. TFN RO membranes incorporated with A-HT demonstrated excellent performance. Compared with the pristine RO membrane, the water flux of A-HT-0.050 prepared with an optimum A-HT concentration of 0.050 wt% was enhanced by 18.6% without sacrificing the salt rejection. Moreover, the selectivity of A-HT-0.050 was superior to that of HT-0.050 prepared with HT of 0.050 wt%, which proved aminosilane modification of hydrotalcite was beneficial to high membrane performance especially to selectivity.
机译：通过将3-氨基丙基三乙氧基硅烷（Apt）改性的水滑石（HT）分散在水溶液中并在界面聚合过程中将纳米颗粒掺入聚酰胺层中的纳米颗粒，制备薄膜纳米复合材料（TFN）反渗噬膜（RO）膜。傅立叶变换红外光谱和Zeta电位表征的结果显示通过Aptes纳米颗粒的成功修饰。此外，傅里叶变换红外光谱表明，氨基硅烷在有机溶液中的氨基硅烷上发生胺化，在纳米颗粒和聚酰胺基质之间提供牢固的共价相互作用。动态光散射和透射电子显微镜表明，氨基硅烷改性改善了纳米颗粒在水溶液中的分散性，并得到膜，抑制了聚集体。共价相互作用和聚集抑制均有利于纳米颗粒和聚酰胺基质之间的相容性。与A-HT合并的TFN RO膜表现出优异的性能。与原始RO膜相比，通过最佳A-HT浓度为0.050wt％的A-HT-0.050的水通量增强18.6％而不牺牲盐排斥。此外，A-HT-0.050的选择性优于HT-0.050的HT-0.050重量％，其证明了水滑石的氨基硅烷改性有利于高膜性能，尤其是选择性。

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