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Graphene oxide nanofiltration membranes for desalination under realistic conditions
Nature Sustainability ( IF 27.6 ) Pub Date : 2021-01-18 , DOI: 10.1038/s41893-020-00674-3
Zhongzhen Wang , Chen Ma , Chunyan Xu , Scott A. Sinquefield , Meisha L. Shofner , Sankar Nair

The demands of clean water production and wastewater recycling continue to drive nanofiltration membrane development. Graphene oxide (GO) membranes have exhibited the potential to revolutionize nanofiltration, but sustaining high solute rejections at realistic concentrations remains a major challenge. Here we show that a series of membranes based on GO bound to polycyclic π-conjugated cations such as toluidine blue O show substantially enhanced rejections for salts and neutral solutes over a wide concentration range. The observed solute rejection behaviours in these π-intercalated GO membranes can be understood by a dual mechanism of interlayer spacing modulation and creation of diffusion barriers in the two-dimensional interlayer galleries. These membranes are easily scalable and possess good chemical and mechanical robustness in desalination of a multicomponent industrial stream at elevated pH, temperature, stream velocity and solids content.



中文翻译:

实际条件下用于脱盐的氧化石墨烯纳米过滤膜

清洁水生产和废水回收的需求继续推动纳滤膜的发展。氧化石墨烯(GO)膜具有革新纳米过滤的潜力,但在实际浓度下维持高溶质截留率仍然是一项重大挑战。在这里,我们显示了一系列基于GO的与多环π共轭阳离子(如甲苯胺蓝O)结合的膜在宽浓度范围内显示出对盐和中性溶质的截留率显着提高。在这些π中观察到的溶质排斥行为插入的GO膜可以通过层间间距调制和在二维层间画廊中创建扩散屏障的双重机制来理解。这些膜易于扩展,并在pH,温度,料流速度和固体含量较高的多组分工业料流脱盐中具有良好的化学和机械稳定性。

更新日期:2021-01-18
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