Thin film composite forward osmosis membranes based on polydopamine modified polysulfone substrates with enhancements in both water flux and salt rejection
Thin film composite forward osmosis membranes based on polydopamine modified polysulfone substrates with enhancements in both water flux and salt rejection
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DOI：
10.1016/j.ces.2012.05.033
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发表时间：
2012-10-01
影响因子：
4.7
通讯作者：
Chung, Tai-Shung
中科院分区：
文献类型：
--
作者：
Han, Gang;Zhang, Sui;Chung, Tai-Shung
通过在表面功能化的多孔聚合物基底上进行界面聚合，可以提高薄膜复合正渗透膜的分离性能。该方法以间苯二胺（MPD）和均苯三甲酰氯（TMC）为界面聚合单体，通过氧化剂引发的多巴胺聚合反应，在聚砜（PSf）基底上表面修饰一种新型的仿生聚合物聚多巴胺（PDA），形成聚酰胺（PA）截留层。这种新的方案已经揭示，与在原始PSf基底上构造的那些相比，可以同时制造具有显著改善的水渗透性和盐截留性能的新型TFC-FO膜。约20 I/g的高J（w）/h（s）（或约0.05 g/l的低J（s）/J（w））可以通过在测试配置中使用2 M NaCl作为汲取溶液和去离子水作为进料溶液来实现，其中活性层在23 ℃下面向汲取溶液。PDA表面改性步骤在TFC-FO膜的制备中起着积极的作用，这是通过产生具有较小表面孔和较窄孔径分布的亲水光滑膜表面以用于界面聚合反应以及改善基底内部孔壁的亲水性来实现的。此外，涂覆的PDA层可以在界面聚合期间与TMC单体积极地相互作用，这可能有利于形成具有高盐截留率的更好质量的PA层。(C)2012爱思唯尔有限公司保留所有权利。
A novel approach has been demonstrated to improve the separation performance of thin film composite (TFC) forward osmosis (FO) membranes, which were interfacial polymerized on the surface functionalized porous polymeric substrates. In the new approach, top surface of the polysulfone (PSf) substrates were modified by a novel bio-inspired polymer polydopamine (PDA) through the oxidant-induced dopamine polymerization in a Tris-buffer solution at pH=8.5 in air, over which m-phenylenediamine (MPD) and trimesoyl chloride (TMC) were employed as the monomers for the interfacial polymerization reaction to form a polyamide (PA) rejection layer. This new scheme has revealed that it is possible to fabricate novel TFC-FO membranes with significantly improved water permeability and salt rejection properties simultaneously compared with those constructed on pristine PSf substrates. A high J(w)/h(s) of about 20 I/g (or a low J(s)/J(w) of about 0.05 g/l) can be achieved by using a 2 M NaCl as the draw solution and deionized water as the feed solution in a testing configuration where the active layer facing the draw solution at 23 degrees C. The PDA surface modification step plays a positive role in the fabrication of TFC-FO membranes, which is realized by producing a hydrophilic smooth membrane surface with smaller surface pores and a narrower pore size distribution for the interfacial polymerization reaction, as well as improving the hydrophilicity of the pore wall inside the substrate. Furthermore, the coated PDA layer could actively interact with TMC monomer during the interfacial polymerization, which may be favorable for the formation of a better quality PA layer with a high salt rejection. (C) 2012 Elsevier Ltd. All rights reserved.