TY - JOUR
T1 - Zeolite Imidazolate Frameworks-8@SiO2−ZrO2 Crystal−Amorphous Hybrid Core−Shell Structure as a Building Block for Water Purification Membranes
AU - Chen, Xinxin
AU - Boffa, Vittorio
AU - Ma, Xianzheng
AU - Magnacca, Giuliana
AU - Calza, Paola
AU - Wang, Deyong
AU - Meng, Fanpeng
AU - Nielsen, Asbjørn Haaning
AU - Deganello, Francesca
AU - Li, Kang
AU - Yue, Yuanzheng
PY - 2024/3/6
Y1 - 2024/3/6
N2 - 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.
AB - 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.
KW - ZIF-8
KW - amorphous silica
KW - aquaculture effluent
KW - nanofiltration
KW - urban wastewater
U2 - 10.1021/acsami.3c19559
DO - 10.1021/acsami.3c19559
M3 - Journal article
SN - 1944-8244
VL - 16
SP - 11835
EP - 11848
JO - ACS Applied Materials & Interfaces
JF - ACS Applied Materials & Interfaces
IS - 9
ER -