Forward osmosis application of modified TiO2-polyamide thin film nanocomposite membranes
Forward osmosis application of modified TiO2-polyamide thin film nanocomposite membranes
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DOI：
10.1080/19443994.2015.1065441
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发表时间：
2016-06-26
影响因子：
1.1
通讯作者：
Jahanshahi, Mohsen
中科院分区：
文献类型：
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作者：
Amini, Maryam;Rahimpour, Ahmad;Jahanshahi, Mohsen
近年来，二氧化钛纳米粒子改善了膜的表面性质和性能。然而，纳米颗粒的团聚仍然是产生均匀表面的主要障碍之一。改善纳米颗粒分散性的最佳方法之一是对纳米颗粒进行改性。本研究采用APTES作为硅烷偶联剂对TiO2进行化学改性。通过在1,3-苯二胺（MPD）水溶液中掺入不同浓度的改性TiO2纳米粒子，制备了新型薄膜纳米复合膜（TFN），提高了膜的正向渗透性能。从膜结构、表面性能、分离性能、FO性能等方面对制备的TFN膜进行了表征，并与普通薄膜复合材料（TFC）膜进行了比较。形态学研究表明，改性TiO2的掺入显著改变了FO膜的表面性能。与TFC膜相比，TFN膜在改性TiO2负载（0.01-0.1wt./v%）的所有范围内都具有较高的透水性和良好的阻盐性。当活性层面对进料溶液时，最具渗透性的膜为TFN 0.1，其水通量约为40L/m(2)h。这些TFN FO膜显著改善了FO膜的性能。
Recently, TiO2 nanoparticles have improved the surface properties and performance of membranes. However, the agglomeration of the nanoparticles remains as one of the major obstacles for generating the uniform surface. One of the best ways to improve dispersion of nanoparticles is the modification of nanoparticles. In this study, chemical modification of TiO2 was approached using APTES as silane coupling agent. The new thin film nanocomposite (TFN) membranes were synthesized by incorporation of different concentrations of modified TiO2 nanoparticles in aqueous solution of 1,3-Phenylendiamine (MPD) to enhance the forward osmosis (FO) performance of the membranes. The fabricated TFN membranes were characterized in terms of membranes structure, surface properties, separation properties, FO performance, and compared with common thin-film composite (TFC) membrane. The morphological studies showed that the incorporation of modified TiO2 significantly changed the surface properties of FO membranes. The TFN membranes exhibited high water permeability and acceptable salt rejection in all ranges of the modified TiO2 loading (0.01-0.1wt./v%) in comparison to the TFC membrane. The most permeable membrane, TFN 0.1, had a water flux about 40L/m(2)h when the active layer facing feed solution. These TFN FO membranes significantly improved the performance of the FO membranes.