MOF-based core-shell structures nanofiltration membranes for water purification

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

*Corresponding author for this work

Research output: Contribution to conference without publisher/journalConference abstract for conferenceResearchpeer-review

Abstract

Metal-organic framework (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 ceramic tubular supports, completely avoiding the use of dispersants or binders. Zeolite imidazolate frameworks-8 (ZIF-8) nanocrystals were synthesized using a hydrothermal method 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, present 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.
Original languageEnglish
Publication date2023
Publication statusPublished - 2023
EventXVIIIth Conference of the European Ceramic Society
- France, Lyon, France
Duration: 2 Jul 20236 Jul 2023
https://www.ecers2023.org/

Conference

ConferenceXVIIIth Conference of the European Ceramic Society
LocationFrance
Country/TerritoryFrance
CityLyon
Period02/07/202306/07/2023
Internet address

Keywords

  • ZIF-8
  • Amorphous silica
  • Nanofiltration
  • Aquaculture effluent
  • Urban wastewater

Fingerprint

Dive into the research topics of 'MOF-based core-shell structures nanofiltration membranes for water purification'. Together they form a unique fingerprint.

Cite this