Polyelectrolyte functionalized lamellar graphene oxide membranes on polypropylene support for organic solvent nanofiltration
Polyelectrolyte functionalized lamellar graphene oxide membranes on polypropylene support for organic solvent nanofiltration
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DOI：
10.1016/j.carbon.2017.07.011
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发表时间：
2017-10-01
期刊：
影响因子：
10.9
通讯作者：
Chung, Tai-Shung
中科院分区：
文献类型：
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作者：
Hua, Dan;Chung, Tai-Shung
我们首次报道了一种简单而环保的方法，在坚固的疏水性聚丙烯（PP）载体上分子设计氧化石墨烯（GO）纳米片，该纳米片具有优异的附着力和优异的分离性能，可用于染料/乙醇混合物的有机溶剂纳滤（OSN）。该方法包括：(1)在氩气等离子体（TPP）的帮助下用聚乙二醇（PEG）接枝PP表面；(2)氧化石墨烯分散体的压力辅助过滤；(3)各种聚电解质的功能化。我们发现，在TPP/GO膜的最外层被超支化聚乙烯亚胺（HPEI）修饰的膜对阳离子染料有很高的排斥。它对阿利新蓝的拒斥率为95%，具有14.9 L m(-2) h(-1) bar（-1）的高渗透率。同样，如果在其最外层用聚苯乙烯磺酸酯（PSS）修饰，则表现出优异的阴离子染料/乙醇分离。对玫瑰孟加拉的拒绝率高达97%，总渗透率为3.1 L m(-2) h(-1) bar（-1）。实验结果证实，分子筛分和静电斥力是氧化石墨烯基膜分离染料/有机溶剂混合物的关键因素。这项工作不仅可以拓宽氧化石墨烯沉积膜支撑材料的选择范围，还可以为开发用于OSN的氧化石墨烯基膜提供有用的见解。(C) 2017 Elsevier Ltd.版权所有。
We have reported, for the first time, a straightforward and eco-friendly approach to molecularly design graphene oxide (GO) nanosheets on robust hydrophobic polypropylene (PP) supports with excellent adhesion and superior separation performance for organic solvent nanofiltration (OSN) of dye/ethanol mixtures. The approach consists of (1) grafting the PP surface with polyethylene glycol (PEG) with the aid of argon plasma (TPP), (2) a pressure-assisted filtration of GO dispersion and (3) functionalization by various polyelectrolytes. We find that the TPP/GO membrane modified by hyperbranched polyethylenimine (HPEI) on its outmost layer has high rejections toward cationic dyes. It has a rejection of 95% toward Alcian blue with a high permeance of 14.9 L m(-2) h(-1) bar(-1). Similarly, it exhibits excellent anionic dye/ethanol separation if it is modified by poly(styrenesulfonate) (PSS) on its outmost layer. It shows a rejection up to 97% toward Rose bengal with a total permeance of 3.1 L m(-2) h(-1) bar(-1). Experimental results confirm that both molecular sieving and electrostatic repulsion play critical factors for GO based membranes to separate dye/organic solvent mixtures. This work may not only widen the selection of membrane support materials for GO deposition but also provide useful insights for developing GO based membranes for OSN. (C) 2017 Elsevier Ltd. All rights reserved.