Ultrathin graphene oxide-based hollow fiber membranes with brush-like CO(2)-philic agent for highly efficient CO(2) capture.
Ultrathin graphene oxide-based hollow fiber membranes with brush-like CO(2)-philic agent for highly efficient CO(2) capture.
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DOI：
10.1038/s41467-017-02318-1
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发表时间：
2017-12-13
影响因子：
16.6
通讯作者：
Yu M
中科院分区：
文献类型：
--
作者：
Zhou F;Tien HN;Xu WL;Chen JT;Liu Q;Hicks E;Fathizadeh M;Li S;Yu M
在目前的CO2捕集技术中，膜气体分离具有许多传统技术所不能比拟的优点。然而，制造具有高CO2渗透性和高CO2/N2选择性的气体分离膜，特别是在湿条件下，是一个挑战。在这项研究中，亚20纳米厚，层状氧化石墨烯（GO）为基础的中空纤维膜与接枝，刷状亲CO2剂交替GO层之间的制备通过一个简单的涂层工艺，在潮湿条件下高效CO2/N2分离。作为一种有效的亲CO2试剂，哌嗪作为载体刷通过化学键合引入到GO纳米通道中。该膜在模拟烟气条件下表现出优异的分离性能，CO2渗透率为1，020 GPU，CO2/N2选择性高达680，证明了其从烟气中捕获CO2的潜力。我们期望这种基于GO的膜结构与简易的涂覆工艺相结合，以促进用于CO2捕获的基于CO2的膜的开发。膜分离技术显示出CO2捕获的前景，但通常受到渗透性和选择性之间的权衡。在这里，作者生产了涂有氧化石墨烯和亲CO2试剂的中空纤维膜，可以在潮湿条件下有效地从烟道气中分离CO2。
Among the current CO2 capture technologies, membrane gas separation has many inherent advantages over other conventional techniques. However, fabricating gas separation membranes with both high CO2 permeance and high CO2/N2 selectivity, especially under wet conditions, is a challenge. In this study, sub-20-nm thick, layered graphene oxide (GO)-based hollow fiber membranes with grafted, brush-like CO2-philic agent alternating between GO layers are prepared by a facile coating process for highly efficient CO2/N2 separation under wet conditions. Piperazine, as an effective CO2-philic agent, is introduced as a carrier-brush into the GO nanochannels with chemical bonding. The membrane exhibits excellent separation performance under simulated flue gas conditions with CO2 permeance of 1,020 GPU and CO2/N2 selectivity as high as 680, demonstrating its potential for CO2 capture from flue gas. We expect this GO-based membrane structure combined with the facile coating process to facilitate the development of ultrathin GO-based membranes for CO2 capture. Membrane separation technologies show promise for CO2 capture, but typically suffer from a trade-off between permeance and selectivity. Here, the authors produce hollow fiber membranes coated with graphene oxide and a CO2-philic agent that can efficiently separate CO2 from flue gas under wet conditions.
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