Ultrathin graphene oxide-based hollow fiber membranes with brush-like CO<sub>2</sub>-philic agent for highly efficient CO<sub>2</sub> capture.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 29235466.
- Also identified by DOI 10.1038/s41467-017-02318-1 and PMC identifier 5727382.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
Among the current CO<sub>2</sub> capture technologies, membrane gas separation has many inherent advantages over other conventional techniques. However, fabricating gas separation membranes with both high CO<sub>2</sub> permeance and high CO<sub>2</sub>/N<sub>2</sub> 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 CO<sub>2</sub>-philic agent alternating between GO layers are prepared by a facile coating process for highly efficient CO<sub>2</sub>/N<sub>2</sub> separation under wet conditions. Piperazine, as an effective CO<sub>2</sub>-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 CO<sub>2</sub> permeance of 1,020 GPU and CO<sub>2</sub>/N<sub>2</sub> selectivity as high as 680, demonstrating its potential for CO<sub>2</sub> 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 CO<sub>2</sub> capture.