Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 13, Issue 41, Pages 48679-48690Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c13801
Keywords
metal-organic framework membrane; metal-polyphenolic complex; interfacial polymerization; reverse osmosis; desalination
Funding
- National Natural Science Foundation of China [21736009, 21808202]
- Zhejiang Provincial Bureau of Science and Technology, China [2021C03169]
- SINOPEC Science and Technology Development Project from China Petrochemical Corporation [33750000-20-ZC0607-0012]
- Tongjiang Scholarship from Fujian Quanzhou Government
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The use of Fe3+-polyphenolic complex coating as an interlayer allows for the effective preparation of stable and high-quality MOF-based PA nanocomposite RO membranes, resulting in improved permeate flux and NaCl rejection rate.
The metal-organic framework (MOF)-based polyamide (PA) membranes applied for desalination with high permeability and selectivity are attracting more and more attention. However, the design and fabrication of high-quality and stable MOF-based PA nanocomposite reverse osmosis (RO) membrane still remain a big challenge. Herein, Fe3+-polyphenolic complex coating via interfacial coordination was first explored as an interlayer of an in situ assembled stable and high-quality Fe(BTC)-based PA nanocomposite RO membranes for desalination. Although depositing the Fe3+-polyphenolic complex on the polymer support, sufficient heterogeneous nucleation sites for the in situ synthesizing Fe(BTC) are provided. Using this strategy, we can not only facilely prepare continuous MOF-based PA nanocomposite RO membranes, ignoring the complicated and time-consuming co-blending process and the MOF-particle aggregation, but also restrict the formation of PA matrix inside the pores of the support membrane and increase the rigidity of the polyamide chain. The method also gives a proper level of generality for the fabrication of versatile stable MOF-based PA RO membranes on various supports. The prepared PA/Fe(BTC) composite membrane exhibited excellent separation performance with a large permeate flux of 2.93 L m(-2) h(-1) bar(-1) and a high NaCl rejection of 96.8%.
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