Tailored Graphene Oxide Membranes for the Separation of Ions and Molecules,ACS Applied Energy Materials

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Tailored Graphene Oxide Membranes for the Separation of Ions and Molecules
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2019-09-11 00:00:00 , DOI: 10.1021/acsanm.9b01356
Junzhang Ye _{1,

2} , Bowu Zhang _{2,

3} , Yu Gu _{2,

4} , Ming Yu ₃ , Dawei Wang ₁ , Jiangyu Wu ₁ , Jingye Li _{2,

3}

Affiliation

Graphene oxide (GO) membranes, with 2D nanochannels and peculiar permeation performance, are promising nanobarriers for ion and molecule separations. However, practical applications have been challenged by dramatic deterioration in mechanical durability, structural stability, and sieving ability under aqueous solution. Thus, the enhancement of stability while maintaining species sieving under aqueous conditions is a key topic of GO-based membrane research. Herein, the functionalization of GO membranes was investigated by combining imidazolium complexation with electron beam irradiation to enhance membrane stability in aqueous solution, which included improvements in mechanical strength and suppression of interlayer spacing (d-spacing) of GO laminates in aqueous solution. Here, 1-allyl-3-vinylimidazolium chloride ([AVIM]Cl) was first used to complex with GO sheets and were subsequently covalently bonded onto adjacent GO sheets by electron beam irradiation. It was found that prepared GO-hybrid membranes could withstand 15.9 kPa of hydrostatic pressure and that d-spacing enlargement after water immersion was effectively suppressed, compared to original GO membranes. In addition, the properties of GO hybrid membranes were easily controlled via the mass ratio of [AVIM]Cl/GO in the mixed GO dispersions and the absorbed dose and dose rate of electron beam irradiation. Permeation results revealed that electrostatic repulsion between imidazolium cation and metal ions had a crucial influence on metal ion permeation through GO-hybrid membranes. The well-confined d-spacing in the wet state made the resultant membranes completely sieve out species with hydrated diameters >0.99 nm. This study confirmed that imidazolium-complexation coupling with electron beam irradiation was effective for tailoring GO membranes with enhanced mechanical durability and controlled d-spacing, which benefitted its applications for ion and molecule separations in aqueous solution.

中文翻译：

量身定制的氧化石墨烯膜，用于离子和分子的分离

具有2D纳米通道和独特的渗透性能的氧化石墨烯（GO）膜是用于离子和分子分离的有前途的纳米屏障。但是，实际应用受到了机械耐久性，结构稳定性和在水溶液中的筛分能力的显着降低的挑战。因此，在水条件下保持物种筛选的同时提高稳定性是基于GO的膜研究的关键课题。在这里，通过结合咪唑鎓络合物和电子束辐照来提高水溶液中的膜稳定性，从而研究了GO膜的功能，包括提高机械强度和抑制层间距（d（间距）GO层压板在水溶液中。在此，首先使用1-烯丙基-3-乙烯基咪唑鎓氯化物（[AVIM] Cl）与GO片络合，然后通过电子束辐照将其共价键合到相邻的GO片上。已经发现，制备GO-杂化膜可以承受的静水压力和15.9千帕d与原始的GO膜相比，有效地抑制了水浸后的-spacing扩大。另外，通过混合的GO分散体中的[AVIM] Cl / GO的质量比以及电子束辐射的吸收剂量和剂量率，可以容易地控制GO杂化膜的性能。渗透结果表明，咪唑鎓阳离子与金属离子之间的静电排斥对金属离子通过GO混合膜的渗透具有至关重要的影响。湿状态下良好限制的d间距使所得的膜完全筛出水合直径> 0.99 nm的物质。这项研究证实用电子束照射该咪唑鎓络合耦合是有效的具有增强的机械耐久性和控制剪裁GO膜d间距，有利于其在水溶液中进行离子和分子分离的应用。

更新日期：2019-09-11

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