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Charge-Gated Ion Transport through Polyelectrolyte Intercalated Amine Reduced Graphene Oxide Membranes
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2017-11-16 00:00:00 , DOI: 10.1021/acsami.7b13724
Xiaoxiao Song 1 , Rahul S. Zambare 2 , Saren Qi 3 , Bhuvana NIL Sowrirajalu 2 , Antony Prince James Selvaraj 2 , Chuyang Y. Tang 4 , Congjie Gao 1
Affiliation  

Charge-gated channels are nature’s solutions for transport of water molecules and ions through aquaporins in biological membranes while excluding undesired substances. The same mechanism has good potentials to be adopted in pressure or electrically driven membrane separation processes. Herein, we report highly charged nanochannels created in polyelectrolyte (PE) intercalated amine reduced graphene oxide membrane (PE@ArGO membrane). The PE@ArGO membrane, with a rejection layer of ∼160 nm in thickness, features a laminate structure and a smooth top surface of a low roughness (typically ∼17.2 nm). Further, a modified PE@ArGO membrane (mPE@ArGO membrane) was developed in situ using free chlorine scavenging post-treatment method, which was designed to alter the charge while keeping alteration to the layered structure minimal. The surface charge of the PE@ArGO and mPE@ArGO membrane was +4.37 and −4.28 mC/m2 respectively. In pressure driven processes, the pure water permeability for PE@ArGO and mPE@ArGO was 2.9 and 10.8 L m–2 h–1 bar–1, respectively. Salt rejection is highly dependent on the charge density of the membrane surface, the valence of the co-ions and the size of ions in hydrated form. For example, in the positively charged PE@ArGO membranes, the rejection of the salts follows the order of: R(MgCl2), 93.0% > R(NaCl), 88.2% ≈ R(MgSO4), 88.1% > R(Na2SO4), 65.1%; while in the negatively charged mPE@ArGO membranes, the rejection of the salts follows the order of: R(Na2SO4), 90.3% > R(NaCl), 85.4% > R(MgSO4), 68.3% > R(MgCl2), 42.9%. To the best knowledge of the authors, this is the first study to report graphene oxide based membranes (GOBMs) with high density positive/negative charge gated ion transport behavior. What’s more, the high rejection rate along with high water permeability of the PE@ArGO and mPE@ArGO membranes has not been achieved by other types of GOBMs.

中文翻译:

通过聚电解质插层胺还原的氧化石墨烯膜的电荷门控离子传输。

电荷门控通道是自然界解决方案,用于通过生物膜中的水通道蛋白传输水分子和离子,同时排除不希望的物质。相同的机制具有在压力或电动隔膜分离过程中可以采用的良好潜力。在本文中,我们报道了在聚电解质(PE)插层胺还原氧化石墨烯膜(PE @ ArGO膜)中创建的高电荷纳米通道。PE @ ArGO膜具有约160 nm厚的排斥层,具有层压结构和低粗糙度(通常约17.2 nm)的光滑顶表面。此外,使用游离氯清除后处理方法原位开发了改性的PE @ ArGO膜(mPE @ ArGO膜),该方法旨在改变电荷,同时使对层状结构的改变保持最小。2个。在压力驱动过程中,PE @ ArGO和mPE @ ArGO的纯净水渗透率分别为2.9和10.8 L m –2 h –1 bar –1。脱盐率高度依赖于膜表面的电荷密度,共离子的化合价和水合形式的离子的大小。例如,在带正电的PE @ Argo的膜中,拒绝该盐的如下的顺序:- [R (的MgCl 2),93.0%> [R(NaCl)中,88.2%≈ - [R (硫酸镁4),88.1%> [R (Na 2 SO 4),65.1%;而在带负电的mPE @ ArGO膜中,盐的排阻顺序为:R(Na 2 SO 4),90.3%> R(NaCl),85.4%> R(MgSO 4),68.3%> R( MgCl 2),42.9%。据作者所知,这是第一个报告具有高密度正/负电荷门控离子迁移行为的氧化石墨烯基膜(GOBM)的研究。而且,其他类型的GOBM尚未实现PE @ ArGO和mPE @ ArGO膜的高拒收率以及高透水性。
更新日期:2017-11-17
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