Abstract
Wood-derived materials have been utilized to develop filtration membranes for sustainable oil/water separation. However, it remains a significant challenge to manufacture durable wood-based membranes with high efficiency and ultra-high flux by simple methods. Herein, we report a facile strategy to fabricate a novel superhydrophobic hybrid wood membrane (PDMS@MOF-199/WS) with ultrahigh-flux and excellent oil/water separation performance. Firstly, copper-based metal organic frameworks (MOF-199) were in situ grown on the TEMPO-oxidized wood sponge (TO-WS) substrate to construct a hierarchical micro-nano structure with internal inherent microchannels. Secondly, a super-wetting surface was formed through soaking in polydimethylsiloxane (PDMS) and heat treatment. Remarkably, the water contact angle (WCA) of PDMS@MOF-199/WS could reach 163° and the oil contact angle (OCA) was around 0°, which remained stable over a long period of ultrasonic treatment and tape peeling. More importantly, the as-prepared modified wood membrane can efficiently separate a wide range of immiscible oil/water mixtures, solely by tiny gravity, with ultra-high flux of 10,385 L m−2 h−1 (carbon tetrachloride/water) and separation efficiency of 99.6% (n-hexane). Furthermore, this novel membrane can also effectively separate surfactant-stabilized water-in-oil emulsions with an efficiency of as high as 97.8%. Meanwhile, the hybrid membrane displayed exceptional reusability, maintaining a high-flux of 8599.6 L m−2 h−1 and retaining WCA at 154.8° after 12 cycles. Our results demonstrate that the synergetic impact of MOF-199 and PDMS as a means of encoding on-surface wettability substantially improved the separation efficiency. This work opens a new avenue for the design of functional wood-derived filtration membranes for the ultrahigh flux oil–water separation.
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Funding
We gratefully acknowledge the financial support provided by the Yunnan Agricultural Joint Special General Project (202301BD070001-243), the Yunnan Province Natural Science Key Foundation (202201AS070152), the Key Laboratory of State Forestry and Grassland Administration on Highly Efficient Utilization of Forestry Biomass Resources in Southwest China (2022-KF04), the Scientific Research Fund Project of the Yunnan Provincial Department of Education (2023J0695), Distinguished Young Scholars in Yunnan Province (202001AV070008) and Special Project of “Top Young Talents” of Yunnan Ten Thousand Talents Plan (51900109).
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XZ: Conceptualization, Investigation, Supervision, Writing-original draft. KL: Formal analysis, Methodology, Writing-review & editing. LG: Data curation, Methodology, Validation. XL: Investigation, Formal analysis, Validation. ZX: Software, Methodology. SD: Visualization, Methodology, Investigation. GZ: Conceptualization, Methodology, Supervision, Writing-review & editing, Project administration.
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Zhang, X., Li, K., Guo, L. et al. Construction of superhydrophobic PDMS@MOF-199/wood sponge hybrid membrane for ultrahigh-flux gravitational oil/water separation. Wood Sci Technol 57, 1421–1442 (2023). https://doi.org/10.1007/s00226-023-01502-5
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DOI: https://doi.org/10.1007/s00226-023-01502-5