Tailored Pore Size and Microporosity of Covalent Organic Framework (COF) Membranes for Improved Molecular Separation

Digambar Shinde, Li Cao, Xiaowei Liu, Dinga A.D. Wonanke, Zongyao Zhou, Mohamed N. Hedhili, Matthew Addicoat, Kuo-Wei Huang, Zhiping Lai

Research output: Contribution to journalArticlepeer-review

Abstract

Three highly 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 (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.
Original languageEnglish (US)
Pages (from-to)100008
JournalJournal of Membrane Science Letters
DOIs
StatePublished - Dec 2021

Fingerprint

Dive into the research topics of 'Tailored Pore Size and Microporosity of Covalent Organic Framework (COF) Membranes for Improved Molecular Separation'. Together they form a unique fingerprint.

Cite this