Rajakumari Krishnamoorthi , Fraz Saeed Butt , Nurul A. Mazlan , Siyu Chen , Norbert Radacsi , Shuiqing Yang , Yeomin Yoon , Yi Huang
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The obtained CGO lamellar membrane with well-defined nanochannels showed ultrafast pure water flux of ∼1112 L h<sup>−1</sup> m<sup>−2</sup> bar<sup>−1</sup> and an excellent separation efficiency of >99 % towards negatively charged organic dye molecules at a high permeation flux of ∼932 L h<sup>−1</sup> m<sup>−2</sup> bar<sup>−1</sup>, which was nearly 2.5-fold enhancement compared with that of the pristine GO membrane (∼400 L h<sup>−1</sup> m<sup>−2</sup> bar<sup>−1</sup>). The electrostatic and π–π interaction forces between the CGO membrane and organic dye molecules played a major role in the overall dye separation mechanism. Furthermore, the CGO membrane demonstrated excellent stability with no loss in separation performance (>96 % organic molecules rejection) after exposure to various pH solutions and deionized water (DI) water. 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引用次数: 0
摘要
通过加入带正电荷的表面活性剂--十六烷基三甲基溴化铵(CTAB),开发出了一种制造片状复合氧化石墨烯(CGO)膜的简便方法。通过静电作用,CTAB 在 GO 表面的垂直和水平排列之和调节了 GO 纳米片的层间距。CTAB 插层 GO 膜的内部层间距为 16.97 Å,而 GO 膜的内部层间距为 8.26 Å。所获得的具有清晰纳米通道的 CGO 片层膜显示出 ∼1112 L h-1 m-2 bar-1 的超快纯水通量,在 ∼932 L h-1 m-2 bar-1 的高渗透通量下,对带负电荷的有机染料分子的分离效率高达 >99 %,比原始 GO 膜(∼400 L h-1 m-2 bar-1)提高了近 2.5 倍。CGO 膜与有机染料分子之间的静电力和 π-π 相互作用力在整个染料分离机制中发挥了重要作用。此外,CGO 膜表现出卓越的稳定性,在暴露于各种 pH 溶液和去离子水(DI)后,其分离性能没有下降(有机分子去除率达 96%)。目前的研究工作为形成用于超快分子分离的高度可调且稳定的 CTAB 嵌入式 GO 膜提供了一种直接的方法。
Tuning the interlayer spacing of graphene oxide membrane via surfactant intercalation for ultrafast nanofiltration
A facile method has been developed to fabricate lamellar composite graphene oxide (CGO) membranes by incorporating positively charged surfactants – cetyltrimethylammonium bromide (CTAB). The interlayer spacing of GO nanosheets was regulated by the sum of both vertical and horizontal alignment of CTAB on the GO surface via electrostatic interaction. The CTAB intercalated GO membrane exhibited an internal layer spacing of 16.97 Å compared to 8.26 Å for the GO membrane. The obtained CGO lamellar membrane with well-defined nanochannels showed ultrafast pure water flux of ∼1112 L h−1 m−2 bar−1 and an excellent separation efficiency of >99 % towards negatively charged organic dye molecules at a high permeation flux of ∼932 L h−1 m−2 bar−1, which was nearly 2.5-fold enhancement compared with that of the pristine GO membrane (∼400 L h−1 m−2 bar−1). The electrostatic and π–π interaction forces between the CGO membrane and organic dye molecules played a major role in the overall dye separation mechanism. Furthermore, the CGO membrane demonstrated excellent stability with no loss in separation performance (>96 % organic molecules rejection) after exposure to various pH solutions and deionized water (DI) water. The current work provides a straightforward approach for the formation of highly tunable and stable CTAB-intercalated GO membranes for ultrafast molecular separation.
期刊介绍:
The Journal of Membrane Science is a publication that focuses on membrane systems and is aimed at academic and industrial chemists, chemical engineers, materials scientists, and membranologists. It publishes original research and reviews on various aspects of membrane transport, membrane formation/structure, fouling, module/process design, and processes/applications. The journal primarily focuses on the structure, function, and performance of non-biological membranes but also includes papers that relate to biological membranes. The Journal of Membrane Science publishes Full Text Papers, State-of-the-Art Reviews, Letters to the Editor, and Perspectives.