Covalent organic framework-immobilized wood membrane for efficient, durable, and high-flux nanofiltration
JOURNAL OF CLEANER PRODUCTION(2023)
摘要
Covalent organic frameworks (COFs) are promising for the construction of nanofiltration membranes owing to their uniform, ordered channel structures and high chemical stability. However, developing a low-cost strategy for fabricating COF-based nanofiltration membranes and increasing the long-term stability of the membranes are challenging. Here, we developed a TpPa-wood membrane through the in-situ formation of massive imine COFs on the top surface of a wood block for the rapid and efficient nanofiltration-based separation of organic pollutants. The numerous hydroxyl groups of cellulose in wood provided nucleation sites for the growth of dense, defect-free COFs with a diameter of 1.8 nm. The nano porous COFs enabled efficient separation, while the long and low-tortuosity channels of wood with a diameter of 10-30 mu m facilitated rapid water transport and augmented the mechanical robustness of the membrane. Therefore, the prepared TpPa-wood membrane showed an outstanding separation efficiency of similar to 97.0% toward organic pollutants such as dyes and pharmaceutical molecules at a flux rate of 600 L m(-2) h(-1). In addition, the TpPa-wood membrane exhibited excellent stability at a wide pH range (3-11) and over continuous filtration for 48 h. The TpPa-wood membrane opens up a new avenue for rapid and efficient nanofiltration by combining the merits of nano porous COFs and biomass with numerous micro-channels and high hydrophilicity.
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关键词
Covalent organic frameworks (COFs),Membrane,Nano filtration,Water remediation
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