Large-area graphene-nanomesh/carbon-nanotube hybrid membranes for ionic and molecular nanofiltration
Large-area graphene-nanomesh/carbon-nanotube hybrid membranes for ionic and molecular nanofiltration
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用于离子和分子纳滤的大面积石墨烯-纳米网/碳纳米管杂化膜
DOI：
10.1126/science.aau5321
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发表时间：
2019-06-14
期刊：
影响因子：
56.9
通讯作者：
Duan, Xiangfeng
中科院分区：
文献类型：
--
作者：
Yang, Yanbing;Yang, Xiangdong;Duan, Xiangfeng
支持的石墨烯基膜多孔石墨烯片具有出色的过滤能力，能够阻挡大多数离子，但它们的脆弱性限制了其在实验室演示之外的规模扩大。杨等人。创建了一种由单壁碳纳米管 (SWNT) 网络增强的纳米多孔石墨烯膜，以提供机械稳定性（参见 Mi 的观点）。单壁碳纳米管网络还阻止了石墨烯中裂纹的扩展，有效地将损伤定位到碳纳米管网格中的细胞定义的小区域。该膜表现出高水通量率以及对大多数离子的高截留率。科学，本期第 14 页。 1057;另见 p. 1033 超薄膜由位于碳纳米管支撑网上的带有小孔的石墨烯片组成。纳米多孔二维材料对于离子和分子纳滤很有吸引力，但由于大面积机械强度不足而受到限制。我们报道了一种大面积石墨烯纳米网/单壁碳纳米管（GNM/SWNT）杂化膜，具有优异的机械强度，同时充分捕捉了原子薄膜的优点。单层 GNM 具有高密度、亚纳米孔，可有效传输水分子，同时阻挡溶质离子或分子以实现尺寸选择性分离。 SWNT网络在物理上将GNM分成微米级的岛屿，并充当支撑GNM的微观框架，从而确保原子薄GNM的结构完整性。由此产生的GNM/SWNT膜表现出高透水性和对盐离子或有机分子的高截留率，并且它们在管式模块中保持稳定的分离性能。
Supported graphene-based membranes Porous graphene sheets have excellent filtration capabilities and are able to block most ions, but their fragility limits their scale-up beyond laboratory demonstrations. Yang et al. created a nanoporous graphene membrane reinforced by a network of single-walled carbon nanotubes (SWNTs) to provide mechanical stability (see the Perspective by Mi). The SWNT network also stopped the propagation of cracks in the graphene, effectively localizing the damage to a small area defined by a cell in the carbon nanotube mesh. The membranes showed high water flux rates as well as a high rejection rate for most ions. Science, this issue p. 1057; see also p. 1033 An ultrathin membrane consists of graphene sheets with small pores resting on a support mesh of carbon nanotubes. Nanoporous two-dimensional materials are attractive for ionic and molecular nanofiltration but limited by insufficient mechanical strength over large areas. We report a large-area graphene-nanomesh/single-walled carbon nanotube (GNM/SWNT) hybrid membrane with excellent mechanical strength while fully capturing the merit of atomically thin membranes. The monolayer GNM features high-density, subnanometer pores for efficient transport of water molecules while blocking solute ions or molecules to enable size-selective separation. The SWNT network physically separates the GNM into microsized islands and acts as the microscopic framework to support the GNM, thus ensuring the structural integrity of the atomically thin GNM. The resulting GNM/SWNT membranes show high water permeance and a high rejection ratio for salt ions or organic molecules, and they retain stable separation performance in tubular modules.