Monolayer graphene membranes for molecular separation in high-temperature harsh organic solvents
Name
e2111360118.full.pdf
Description
Published version
Size
1.98 MB
Format
Unknown
Checksum (MD5)
9cf8860cac3f9fa03a49e60a4773d538
Author(s)
Lu, Yanqiu
Zhang, Liling
Shen, Liang
Liu, Wei
Karnik, Rohit
Zhang, Sui
Date Issued
September 2021
Journal
Proceedings of the National Academy of Sciences
Publisher
National Academy of Sciences
Citation
Lu, Yanqiu et al. 2021. "Monolayer graphene membranes for molecular separation in high-temperature harsh organic solvents." Proceedings of the National Academy of Sciences, 118 (37).
Version
Final published version
Abstract
The excellent thermal and chemical stability of monolayer graphene makes it an ideal material for separations at high temperatures and in harsh organic solvents. Here, based on understanding of solvent permeation through nanoporous graphene via molecular dynamics simulation, a resistance model was established to guide the design of a defect-tolerant graphene composite membrane consisting of monolayer graphene on a porous supporting substrate. Guided by the model, we experimentally engineered polyimide (PI) supporting substrates with appropriate pore size, permeance, and excellent solvent resistance and investigated transport across the resulting graphene-covered membranes. The cross-linked PI substrate could effectively mitigate the impacts of leakage through defects across graphene to allow selective transport without defect sealing. The graphene-covered membrane showed pure solvent permeance of 24.1 L m−2 h−1 bar−1 and stable rejection (∼90%) of Allura Red AC (496.42 g mol−1) in a harsh polar solvent, dimethylformamide (DMF), at 100 °C for 10 d.
MIT Department
Massachusetts Institute of Technology. Department of Mechanical Engineering
Terms of Use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1073/pnas.2111360118
