Details

Autor(en) / Beteiligte

• Xu, Li-Hao
• Li, Shen-Hui
• Mao, Heng
• Li, Yan
• Zhang, Ao-Shuai
• Wang, Sen
• Liu, Wei-Min
• Lv, Jing
• Wang, Tao
• Cai, Wei-Wei
• Sang, Le
• Xie, Wen-Wen
• Pei, Chan
• Li, Zheng-Zheng
• Feng, Ying-Nan
• Zhao, Zhi-Ping

Titel

Highly flexible and superhydrophobic MOF nanosheet membrane for ultrafast alcohol-water separation

Ist Teil von

• Science (American Association for the Advancement of Science), 2022-10, Vol.378 (6617), p.308-313

Ort / Verlag

Washington: The American Association for the Advancement of Science

Erscheinungsjahr

2022

Quelle

American Association for the Advancement of Science

Beschreibungen/Notizen

• High-performance pervaporation membranes have potential in industrial separation applications, but overcoming the permeability-selectivity trade-off is a challenge. We report a strategy to create highly flexible metal-organic framework nanosheet (MOF-NS) membranes with a faveolate structure on polymer substrates for alcohol-water separation. The controlled growth followed by a surface-coating method effectively produced flexible and defect-free superhydrophobic MOF-NS membranes. The reversible deformation of the flexible MOF-NS and the vertical interlamellar pathways were captured with electron microscopy. Molecular simulations confirmed the structure and revealed transport mechanism. The ultrafast transport channels in MOF-NS exhibited an ultrahigh flux and a separation factor of 8.9 in the pervaporation of 5 weight % ethanol-water at 40°C, which can be used for biofuel recovery. MOF-NS and polydimethylsiloxane synergistically contribute to the separation performance. Honeycomb channels enhance separations Pervaporation membranes use a combination of permeation and evaporation for energy-efficient separations of volatile compounds from solutions. Xu et al . designed a strategy to fabricate defect-free superhydrophobic metal-organic framework (MOF) nanosheet membranes. Instead of dispersing the MOFs into a polydimethylsiloxane (PDMS) matrix, the authors grew a continuous and uniform layer of embedded MOF seeds on polymeric substrates that were then sealed with PDMS. This procedure results in a honeycomb-like structure with high flexibility and fast molecular transport channels, thus enhancing the separation of alcohols from water. —MSL Flexible metal-organic framework honeycombed nanosheet membranes are applied for alcohol-water separations.