Elucidating the Role of Embedded Metal-Organic Frameworks in Water and Ion Transport Properties in Polymer Nanocomposite Membranes
- Authors
- Lee, Tae Hoon; Oh, Jee Yeon; Jang, Jun Kyu; Moghadam, Farhad; Roh, Ji Soo; Yoo, Seung Yeon; Kim, Yu Jin; Choi, Tae Hwan; Lin, Haiqing; Kim, Hyo Won; Park, Ho Bum
- Issue Date
- Dec-2020
- Publisher
- AMER CHEMICAL SOC
- Citation
- CHEMISTRY OF MATERIALS, v.32, no.23, pp.10165 - 10175
- Indexed
- SCIE
SCOPUS
- Journal Title
- CHEMISTRY OF MATERIALS
- Volume
- 32
- Number
- 23
- Start Page
- 10165
- End Page
- 10175
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/7890
- DOI
- 10.1021/acs.chemmater.0c03692
- ISSN
- 0897-4756
- Abstract
- Metal-organic frameworks (MOFs) have been extensively studied as promising nanofillers in developing high-performance polymer nanocomposite membranes (PNMs) for efficient water/ion separation applications. However, given the ambiguous role of embedded MOFs, achieving simultaneous improvement in both water permeability and water/ion selectivity of PNMs remains challenging. Here, we elucidates fundamental water and ion transport properties of MOF/PNMs to better understand the role of embedded MOFs in polymer matrices. We prepared freestanding PNMs consisting of a cross-linked poly(ethylene glycol) (XPEG)-based hydrogel and nanoporous zeolitic imidazole framework-8 (ZIF-8) exhibiting high diffusivity selectivity. The transport studies and material characterizations, especially with Raman mapping analysis showing a homogeneous distribution of permeating water molecules throughout ZIF-8/XPEG PNM, revealed that the incorporated ZIF-8 acts as an additional water-permselective channel inside the polymeric matrix, which leads to an unusual "reverse-selective" ion transport behavior. Ultimately, 20 wt % of ZIF-8 loading could significantly enhance both water permeability (similar to 240%) and water/NaCl selectivity (similar to 160%) compared to a pure polymer membrane by overcoming the conventional permeability-selectivity trade-off limitation. Our finding provides new insights for developing advanced PNMs for water/ion separation.
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