膜科学与技术

层层自组装PDADMAC/PSS纳滤膜的制备

作者：王宗文苏保卫高学理韩姗姗高从堦

单位：中国海洋大学化学化工学院，海洋化学理论与工程技术教育部重点实验室，青岛 266100

关键词：层层自组装；纳滤膜；荷电性能；分离性能；亲水性

出版年,卷(期):页码： 2012,32(1):27-32

摘要：

以荷负电的PES超滤膜为基膜，采用静态层层自组装技术，制备了PDADMAC/PSS多层聚电解质纳滤膜。考察了支撑盐的种类、浓度、自组装层数对膜的分离性能、荷电性能、亲水性等的影响。研究结果表明，以NaCl为支撑电解质制得的膜具有较高的性能，聚合电解质溶液中支撑电解质的浓度以0.5M为宜；在较优的条件下所制备的(PDADMAC/PSS)5对2g/LNa2SO4的截留率可达93%，通量在1.0MPa下接近60L/m2h，对NaCl的截留率仅为9~13%，通量可达80L/m2h。膜表面的荷电量和接触角的变化均反映了聚电解质的交替自组装。以PSS为最外层的膜表面具有很好的负电性和很低的接触角。随着双层数的增加，膜表面的负电荷量的绝对值先逐渐增大，达到一个极大值后又逐渐减少，说明层数并非越多越好；以PSS作为最外层的膜具有很好的亲水性。

Using negatively charged PES ultrafiltration membrane as substrate, multilayer PDADMAC/PSS polyelectrolytes nanofiltration membranes were prepared by layer-by-layer self-assembly technology. The membrane surface morphology, charging property, as well as the effect of concentration and types of the support electrolyte on the membrane performance were investigated. The results indicated that the prepared NF membrane surface was uniform and with no defect; the values of negative charge on membrane surface first gradually increase with the bi-layer number, and then gradually decrease with the bi-layer number, which demonstrate that there should be an optimal concentration of the support electrolyte. In addition, the performance of the (PDADMAC/PSS)5 NF membranes prepared in optimal conditions was evaluated. The results showed that under 1.0 MPa, the Na2SO4 (2 g/L) rejection was 93%, and corresponding the flux was up to 60 L/m2h; the NaCl rejection was only 9~13%, while the flux could reach 80 L/m2h. The prepared NF membrane could be completely used for the separation of univalent and bivalent salt solution system. The variation of contact angles reflect the alternative self-assembly of the polyelectrylytes. The prepared NF membranes with PSS as surface layer have excellent hydrophilic property.

王宗文（1985~），山东济南人，硕士研究生，研究方向：纳滤膜分离技术。* 通讯联系人：苏保卫，subaowei@ouc.edu.cn

参考文献：

[1 ] Jin Wanqin, Toutianoush A , Tieke B. Use of Polyelectrolyte Layer-by-Layer Assemblies as Nanofiltration and Reverse Osmosis Membranes [J]. Langmuir. 2003, 19: 2550-2553.
[ 2] A. El-Hashani, Ali Toutianoush, Bernd Tieke. Use of layer-by-layer assembled ultrathin membranes of dicopper-[18]azacrown-N6 complex and polyvinylsulfate for water desalination under nanofiltration conditions [J].Journal of Membrane Science.2008, 318:65–70.
[ 3] Hong S U , Malaisamy R , Bruening M L. Optimization of ?ux and selectivity in Cl−/SO42− separations with multilayer polyelectrolyte membranes [J]. Journal of Membrane Science, 2006,283: 366-372.
[4 ] Seong Uk Hong, Matthew D. Miller, and Merlin L. Bruening. Removal of Dyes, Sugars, and Amino Acids from NaCl Solutions Using Multilayer Polyelectrolyte Nanofiltration Membranes [J].Ind. Eng. Chem. Res. 2006, 45: 6284-6288.
[ 5] Ramamoorthy Malaisamy, Merlin L. Bruening. High-Flux Nanofiltration Membranes Prepared by Adsorption of Multilayer Polyelectrolyte Membranes on Polymeric Supports [J]. Langmuir. 2005, 21:10587-10592.
[6 ] Hui-Yu Deng, You-Yi Xu, Bao-Ku Zhu, et.al. Polyelectrolyte membranes prepared by dynamic self-assembly of poly (4-styrenesulfonic acid-co-maleic acid) sodium salt (PSS/MA) for nanofiltration (I) [J].Journal of Membrane Science. 2008,323: 125–133.
[ 7] 邓慧宇，朱宝库，徐又一等．PSS、PSS-co-MA/PAH动态自组装制备荷正电纳滤膜[J]．功能材料．2008，39（8）：1313-1317．
[ 8] 曹志源，方建慧，刘达等．PSS／PAH聚电解质复合纳滤膜制备及其性能研究[J]．功能材料.2007，38：2727-2703．
[ 9] 刘达，方建慧，曹志源等．PES基膜表面PSS/PDADMAC多层膜的构筑及其离子截留性能[J]．上海大学学报（自然科学版)．2008，14（4）：423-427．
[10 ] 徐又一，徐志康．高分子膜材料[M]．北京：化学工业出版社，2005．
[ 11] 沈家骢等. 超分子层结构-组装与功能[M]. 北京：科学出版社，2005：16.
[ 12] 金谷. 表面活性剂化学[M]. 合肥：中国科学技术大学出版社，2008：83.
[ 13] Maneesha Adusumilli, Merlin L.Bruening. Variation of Ion-Exchange Capacity ζ Potential, and Ion-Transport Selectivities with the Number of Layers in a Multilayer Polyelectrolyte Film [J]. Langmuir.2009, 25(13):7478–7485.
[ 14] Rashida N. Smith, Linda Reven, Christopher J. Barrett. 13C Solid-State NMR Study of Polyelectrolyte Multilayers [J].Macromolecules. 2003, 36: 1876-1881.

服务与反馈：

【文章下载】【加入收藏】

《膜科学与技术》编辑部地址：北京市朝阳区北三环东路19号蓝星大厦邮政编码：100029 电话：010-64426130/64433466 传真：010-80485372邮箱：mkxyjs@163.com