Zeolite Imidazolate Frameworks-8@SiO2−ZrO2 Crystal−Amorphous Hybrid Core−Shell Structure as a Building Block for Water Purification Membranes

Xinxin Chen, Vittorio Boffa*, Xianzheng Ma, Giuliana Magnacca, Paola Calza, Deyong Wang, Fanpeng Meng, Asbjørn Haaning Nielsen, Francesca Deganello, Kang Li, Yuanzheng Yue

*Kontaktforfatter

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

1 Citationer (Scopus)

Abstract

Metal–organic frameworks (MOFs) are emerging as promising materials for water purification membranes, owing to their uniform microporous structures and chemical functionalities. Here, we report a simple procedure for depositing MOF-based nanofiltration membranes on commercial TiO2 ceramic tubular supports, completely avoiding the use of dispersants or binders. Zeolite imidazolate frameworks-8 (ZIF-8) nanocrystals were synthesized in methanol at room temperature and subsequently coated with an amorphous SiO2–ZrO2 gel to generate a dispersion of ZIF-8@SiO2–ZrO2 core–shell nanoparticles. The amorphous SiO2–ZrO2 gel served as a binding agent for the ZIF-8 nanocrystals, thus forming a defect-free continuous membrane layer. After repeating the coating twice, the active layer had a thickness of 0.96 μm, presenting a rejection rate >90% for the total organic carbon in an aquaculture effluent and in a wastewater treatment plant, while reducing the concentration of trimethoprim, here used as a target pollutant. Moreover, the oxide gel provided the MOF-based active layer with good adhesion to the support and enhanced its hydrophilicity, resulting in a membrane with excellent mechanical stability and resistance to fouling during the crossflow filtration of the real wastewater samples. These results implied the high potential of the MOF-based nanocomposite membrane for effective treatment of actual wastewater streams.
OriginalsprogEngelsk
TidsskriftACS Applied Materials & Interfaces
Vol/bind16
Udgave nummer9
Sider (fra-til)11835-11848
Antal sider14
ISSN1944-8244
DOI
StatusUdgivet - 6 mar. 2024

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