Design of Sub‐Nanochannels between Graphene Oxide Sheets via Crown Ether Intercalation to Selectively Regulate Cation Permeation,Advanced Materials Interfaces

当前位置： X-MOL 学术 › Adv. Mater. Interfaces › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Design of Sub‐Nanochannels between Graphene Oxide Sheets via Crown Ether Intercalation to Selectively Regulate Cation Permeation
Advanced Materials Interfaces ( IF 4.3 ) Pub Date : 2020-03-06 , DOI: 10.1002/admi.201901876
Ki Ryuk Bang _{1,

2} , Daniel Bahamon ₃ , Lourdes F. Vega ₃ , Eun Seon Cho _{1,

2}

Affiliation

Graphene‐based membranes are a promising candidate for separating pollutants and ions. In particular, graphene oxide (GO) membranes are widely studied due to their unique nanochannels. The characteristic nanochannels of GO membranes can be manipulated via intercalation of cations, inhibiting the transport of other ions in the diffusion process. To maintain the tailored nanochannel during a pressure‐assisted filtration procedure, it is essential to retain such inserted cations. Here, dibenzo‐18‐Crown‐6 molecules (DB18C6) tightly binding to potassium ions are intercalated into GO nanosheets for preventing the leakage of the potassium ions from the nanochannel in the separation process. The complex between potassium ion and DB18C6 forges sub‐nanochannels between GO nanochannels, controlling the salt rejection rate as well as the permeation of water molecules, and selectively inhibiting the transport of Na⁺ ions compared to the untreated GO membrane. The as‐prepared GO@Crown composite membranes exhibit excellent NaCl rejection rates (up to 60%), water permeance (3.11–8.86 LMH bar⁻¹), and a Na⁺ rejection rate (up to 62.5%) as well as an outstanding Na₂SO₄ rejection rate (up to 88%) in the dead‐end filtration process. Molecular dynamics compute the tunable interlayer spacing of GO@Crown composite membranes and the possible configuration of crown ethers between GO layers, supporting the experimental results.

中文翻译：

通过冠醚插层设计可选择性调节阳离子渗透的氧化石墨烯片之间的亚纳米通道设计

基于石墨烯的膜是分离污染物和离子的有前途的候选者。特别地，由于其独特的纳米通道，对氧化石墨烯（GO）膜进行了广泛的研究。GO膜的特征性纳米通道可以通过阳离子的嵌入来操纵，从而抑制了扩散过程中其他离子的转运。为了在压力辅助过滤过程中维持定制的纳米通道，必须保留此类插入的阳离子。在这里，与钾离子紧密结合的二苯并18-冠6分子（DB18C6）被插入到GO纳米片中，以防止钾离子在分离过程中从纳米通道泄漏。钾离子和DB18C6之间的络合物在GO纳米通道之间形成亚纳米通道，⁺离子与未处理的GO膜相比。制备的GO @ Crown复合膜具有极好的NaCl截留率（高达60％），透水率（3.11-8.86 LMH bar ^-1），Na ⁺截留率（高达62.5％）以及出色的死角过滤过程中Na ₂ SO _4的排斥率（高达88％）。分子动力学计算GO @ Crown复合膜的可调层间距以及GO层之间冠状醚的可能构型，支持实验结果。

更新日期：2020-03-06

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11