Highly hydrophilic thin-film composite forward osmosis membranes functionalized with surface-tailored nanoparticles.
Highly hydrophilic thin-film composite forward osmosis membranes functionalized with surface-tailored nanoparticles.
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DOI：
10.1021/am301532g
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发表时间：
2012-09
影响因子：
9.5
通讯作者：
A. Tiraferri;Yan Kang;E. Giannelis;M. Elimelech
中科院分区：
文献类型：
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作者：
A. Tiraferri;Yan Kang;E. Giannelis;M. Elimelech
薄膜复合聚酰胺膜是用于基于膜的水净化和海水淡化工艺的最先进材料，这些工艺要求高污染物去除率和高透水性。然而，由于聚酰胺固有的表面物理化学特性，这些膜在处理天然水和废水时容易结垢。目前的工作展示了通过使用微调纳米颗粒进行简单且可扩展的功能化，制造具有优化表面性能的正向渗透聚酰胺膜。二氧化硅纳米颗粒涂有超亲水配体，该配体具有赋予纳米颗粒稳定性并不可逆地结合到膜选择性层上的天然羧基部分的官能团。紧密束缚的纳米粒子层调整了新型复合膜的表面化学性质，而不改变膜选择性层的形态或水/溶质渗透性。表面表征和界面能分析证实成功获得了高度亲水和可润湿的膜表面。在新型膜材料和模型有机污染物之间测量到较低的分子间粘附力，表明聚酰胺膜表面存在结合水合层，为污染物粘附形成屏障。
Thin-film composite polyamide membranes are state-of-the-art materials for membrane-based water purification and desalination processes, which require both high rejection of contaminants and high water permeabilities. However, these membranes are prone to fouling when processing natural waters and wastewaters, because of the inherent surface physicochemical properties of polyamides. The present work demonstrates the fabrication of forward osmosis polyamide membranes with optimized surface properties via facile and scalable functionalization with fine-tuned nanoparticles. Silica nanoparticles are coated with superhydrophilic ligands possessing functional groups that impart stability to the nanoparticles and bind irreversibly to the native carboxyl moieties on the membrane selective layer. The tightly tethered layer of nanoparticles tailors the surface chemistry of the novel composite membrane without altering the morphology or water/solute permeabilities of the membrane selective layer. Surface characterization and interfacial energy analysis confirm that highly hydrophilic and wettable membrane surfaces are successfully attained. Lower intermolecular adhesion forces are measured between the new membrane materials and model organic foulants, indicating the presence of a bound hydration layer at the polyamide membrane surface that creates a barrier for foulant adhesion.