Tailored pore size and microporosity of covalent organic framework (COF) membranes for improved molecular separation
•COF membranes with tailored pore size are designed through a de novo approach.•Ultrathin and crystalline COF membranes are prepared.•The transport mechanism through COF membrane is studied systematically. Three crystalline truxene-based β-ketoenamine COF membranes (TFP-HETTA, TFP-HBTTA and TFP-HHTT...
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| Published in | Journal of Membrane Science Letters Vol. 1; no. 2; p. 100008 |
|---|---|
| Main Authors | , , , , , , , , |
| Format | Journal Article |
| Language | English |
| Published |
Elsevier B.V
01.12.2021
Elsevier |
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| Online Access | Get full text |
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| Abstract | •COF membranes with tailored pore size are designed through a de novo approach.•Ultrathin and crystalline COF membranes are prepared.•The transport mechanism through COF membrane is studied systematically.
Three crystalline truxene-based β-ketoenamine COF membranes (TFP-HETTA, TFP-HBTTA and TFP-HHTTA) are fabricated via a de novo monomer design approach to understand the fundamental correlations between pore structure and molecular separation performance. By introducing bulky alkyl groups into the truxene framework, the pore size of TFP-HETTA, TFP-HBTTA, and TFP-HHTTA are systematically tuned from 1.08 to 0.72 nm. Accordingly, the TFP-HETTA showed good water permeance of 47 L m−2h−1 bar−1 along with a prominent rejection rate of Reactive Blue (RB, 800 Da) but less than 10% rejection rate of inorganic salts. In contrast, the TFP-HHTTA membrane with pore size of 0.72 nm can reject small dye molecules such as Safranin O (SO, 350 Da) and trivalent salts but with a moderate water permeance of 19 L m−2h−1 bar−1. The pore-flow model rooted from the viscous flow could well fit the observed organic solvent nanofiltration results of all three COF membranes.
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| AbstractList | Three crystalline truxene-based β-ketoenamine COF membranes (TFP-HETTA, TFP-HBTTA and TFP-HHTTA) are fabricated via a de novo monomer design approach to understand the fundamental correlations between pore structure and molecular separation performance. By introducing bulky alkyl groups into the truxene framework, the pore size of TFP-HETTA, TFP-HBTTA, and TFP-HHTTA are systematically tuned from 1.08 to 0.72 nm. Accordingly, the TFP-HETTA showed good water permeance of 47 L m−2 h−1 bar−1 along with a prominent rejection rate of Reactive Blue (RB, 800 Da) but less than 10% rejection rate of inorganic salts. In contrast, the TFP-HHTTA membrane with pore size of 0.72 nm can reject small dye molecules such as Safranin O (SO, 350 Da) and trivalent salts but with a moderate water permeance of 19 L m−2 h−1 bar−1. The pore-flow model rooted from the viscous flow could well fit the observed organic solvent nanofiltration results of all three COF membranes. •COF membranes with tailored pore size are designed through a de novo approach.•Ultrathin and crystalline COF membranes are prepared.•The transport mechanism through COF membrane is studied systematically. Three crystalline truxene-based β-ketoenamine COF membranes (TFP-HETTA, TFP-HBTTA and TFP-HHTTA) are fabricated via a de novo monomer design approach to understand the fundamental correlations between pore structure and molecular separation performance. By introducing bulky alkyl groups into the truxene framework, the pore size of TFP-HETTA, TFP-HBTTA, and TFP-HHTTA are systematically tuned from 1.08 to 0.72 nm. Accordingly, the TFP-HETTA showed good water permeance of 47 L m−2h−1 bar−1 along with a prominent rejection rate of Reactive Blue (RB, 800 Da) but less than 10% rejection rate of inorganic salts. In contrast, the TFP-HHTTA membrane with pore size of 0.72 nm can reject small dye molecules such as Safranin O (SO, 350 Da) and trivalent salts but with a moderate water permeance of 19 L m−2h−1 bar−1. The pore-flow model rooted from the viscous flow could well fit the observed organic solvent nanofiltration results of all three COF membranes. [Display omitted] |
| ArticleNumber | 100008 |
| Author | Liu, Xiaowei Hedhili, Mohamed N. Lai, Zhiping Wonanke, Dinga A.D. Zhou, Zongyao Shinde, Digambar B. Cao, Li Addicoat, Matthew Huang, Kuo-Wei |
| Author_xml | – sequence: 1 givenname: Digambar B. surname: Shinde fullname: Shinde, Digambar B. organization: Division of Physical Science and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia – sequence: 2 givenname: Li surname: Cao fullname: Cao, Li organization: Division of Physical Science and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia – sequence: 3 givenname: Xiaowei surname: Liu fullname: Liu, Xiaowei organization: Division of Physical Science and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia – sequence: 4 givenname: Dinga A.D. surname: Wonanke fullname: Wonanke, Dinga A.D. organization: School of Science and Technology, Nottingham Trent University, Nottingham NG11 8NS, United Kingdom – sequence: 5 givenname: Zongyao surname: Zhou fullname: Zhou, Zongyao organization: Division of Physical Science and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia – sequence: 6 givenname: Mohamed N. surname: Hedhili fullname: Hedhili, Mohamed N. organization: Core labs, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia – sequence: 7 givenname: Matthew surname: Addicoat fullname: Addicoat, Matthew organization: School of Science and Technology, Nottingham Trent University, Nottingham NG11 8NS, United Kingdom – sequence: 8 givenname: Kuo-Wei surname: Huang fullname: Huang, Kuo-Wei organization: Division of Physical Science and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia – sequence: 9 givenname: Zhiping surname: Lai fullname: Lai, Zhiping email: zhiping.lai@kaust.edu.sa organization: Division of Physical Science and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia |
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| Keywords | de novo design Membranes COF Pore-flow model Organic solvent nanofiltration |
| Language | English |
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| Snippet | •COF membranes with tailored pore size are designed through a de novo approach.•Ultrathin and crystalline COF membranes are prepared.•The transport mechanism... Three crystalline truxene-based β-ketoenamine COF membranes (TFP-HETTA, TFP-HBTTA and TFP-HHTTA) are fabricated via a de novo monomer design approach to... |
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| SubjectTerms | COF de novo design Membranes Organic solvent nanofiltration Pore-flow model |
| Title | Tailored pore size and microporosity of covalent organic framework (COF) membranes for improved molecular separation |
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