TY - JOUR
T1 - Tailored Pore Size and Microporosity of Covalent Organic Framework (COF) Membranes for Improved Molecular Separation
AU - Shinde, Digambar
AU - Cao, Li
AU - Liu, Xiaowei
AU - Wonanke, Dinga A.D.
AU - Zhou, Zongyao
AU - Hedhili, Mohamed N.
AU - Addicoat, Matthew
AU - Huang, Kuo-Wei
AU - Lai, Zhiping
N1 - KAUST Repository Item: Exported on 2021-12-14
Acknowledged KAUST grant number(s): BAS/1/1375-01, FCC/1/1972-19
Acknowledgements: The research work was supported by the KAUST Centre Competitive Fund FCC/1/1972-19 and KAUST baseline fund BAS/1/1375-01.
PY - 2021/12
Y1 - 2021/12
N2 - 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.
AB - 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.
UR - http://hdl.handle.net/10754/673923
UR - https://linkinghub.elsevier.com/retrieve/pii/S2772421221000088
U2 - 10.1016/j.memlet.2021.100008
DO - 10.1016/j.memlet.2021.100008
M3 - Article
SN - 2772-4212
SP - 100008
JO - Journal of Membrane Science Letters
JF - Journal of Membrane Science Letters
ER -