Layer-by-layer self-assembly of polycation/GO nanofiltration membrane with enhanced stability and fouling resistance
Layer-by-layer self-assembly of polycation/GO nanofiltration membrane with enhanced stability and fouling resistance
复制标题
聚阳离子/GO纳滤膜的层层自组装增强稳定性和抗污染能力
DOI：
10.1016/j.seppur.2016.01.024
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发表时间：
2016-02-29
影响因子：
8.6
通讯作者：
Ji, Shulan
中科院分区：
文献类型：
--
作者：
Wang, Lin;Wang, Naixin;Ji, Shulan
聚电解质多层膜是制备纳滤膜的一种很好的技术。然而，为了实现工业应用，聚电解质膜的稳定性和抗污染性能有待进一步提高。在这项研究中，氧化石墨烯（GO）纳米片通过聚阳离子通过一层一层的自组装策略在聚丙烯腈衬底上形成多层。由于相邻氧化石墨烯纳米片层的约束作用，限制了聚电解质链的迁移和重排。因此，增强了聚阳离子/氧化石墨烯多层膜的抗膨胀性能，使其性能更加稳定。氧化石墨烯纳米片的抗污性能也提高了多层膜的抗污性能。采用聚阳离子/氧化石墨烯多层膜去除水中染料。在5 bar条件下甲基蓝分子与水分离时，得到的多层膜通量和保留率分别达到6.42 kg m(-2) h(-1) bar（-1）和99.2%。与纯聚电解质多层膜相比，聚阳离子/氧化石墨烯膜的分离性能、稳定性和抗污性能均有显著提高。聚阳离子/氧化石墨烯多层膜具有成本效益，且氧化石墨烯纳米片可以大规模生产，因此有可能用于制备纳滤膜。(C) 2016 Elsevier B.V.版权所有
Polyelectrolyte multilayering is a good technique used to fabricate nanofiltration (NF) membranes. However, the stability and fouling resistance of the polyelectrolyte membranes should be improved for industrial application. In this study, graphene oxide (GO) nanosheets were assembled with polycation to form a multilayer on a polyacrylonitrile substrate via a layer-by-layer self-assembly strategy. The migration and rearrangement of the polyelectrolyte chain were restricted because of the confinement effect of a neighboring GO nanosheet layer. Therefore, the anti-swelling property of the polycation/GO multilayer membrane was enhanced, which resulted in a more stable performance. The fouling resistance of the multilayer membrane was also improved because of the anti-fouling capability of the GO nanosheets. The polycation/GO multilayer membrane was used to remove dye from water. During the separation of methyl blue molecule from water at 5 bar, the flux and retention rate of the obtained multilayer membrane could reach 6.42 kg m(-2) h(-1) bar(-1) and 99.2%, respectively. Compared with a pure polyelectrolyte multilayer membrane, the separation performance, stability, and fouling resistance of the polycation/GO membranes were significantly enhanced. The polycation/GO multilayer membrane can be potentially used to fabricate NF membranes because it is cost efficient and GO nanosheets can be produced in a large scale. (C) 2016 Elsevier B.V. All rights reserved.