| Autor: |
Hui CHEN, Yutao LIU, Jinping LI, Libo LI |
| Jazyk: |
English<br />Chinese |
| Rok vydání: |
2023 |
| Předmět: |
|
| Zdroj: |
Taiyuan Ligong Daxue xuebao, Vol 54, Iss 6, Pp 978-987 (2023) |
| Druh dokumentu: |
article |
| ISSN: |
1007-9432 |
| DOI: |
10.16355/j.tyut.1007-9432.2023.06.003 |
| Popis: |
Purposes Metal-organic framework (MOF) membranes have been extensively studied in recent years owing to their rich porosity as well as their uniform and adjustable pore size. Still, the preparation of ultra-thin and defect-free MOF membranes faces great challenges. Controlling the growth orientation of the MOF membranes helps reduce intergranular defects and optimize membrane thickness. Methods For the first time, an ultra-thin and oriented UTSA-280 MOF membrane is prepared on a porous substrate via a polydopamine (PDA) interface layer-mediation strategy. The PDA layer provides abundant adsorption and anchoring sites for UTSA-280 through multiple interactions with metal ions to facilitate the heterogeneous nucleation and growth of UTSA-280. Furthermore, the nucleation density and growth rate can be controlled through varying PDA deposition amounts to modulate the growth orientation of MOF crystals and membrane thickness. Findings Finally, a (202)-oriented UTSA-280 MOF membrane prepared under optimal conditions with a membrane thickness of 162 nm achieves H2 permeance up to 4 141.8 GPU and H2/CO2 separation selectivity of 18.5, far exceeding the Robeson upper bound in 2008. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
|
