Electrospun Membranes of Hydrophobic Polyimide and NH₂-UiO-66 Nanocomposite for Desalination

Abstract

Hydrophobic nanofiber composite membranes comprising polyimide and metal–organic frameworks are developed for desalination via direct contact membrane distillation (DCMD). Our study demonstrates the synthesis of hydrophobic polyimides with trifluoromethyl groups, along with superhydrophobic UiO-66 (hMOF) prepared by phenylsilane modification on the metal-oxo nodes. These components are then combined to create nanofiber membranes with improved hydrophobicity, ensuring long-term stability while preserving a high water flux. Integration of hMOF into the polymer matrix further increases membrane hydrophobic properties and provides additional pathways for vapor transport during MD. The resulting nanofiber composite membranes containing 20 wt% of hMOFs (PI-1-hMOF-20) were able to desalinate hypersaline feed solution of up to 17 wt% NaCl solution, conditions that are beyond the capability of reverse osmosis systems. These membranes demonstrated a water flux of 68.1 kg m^-2 h^-1 with a rejection rate of 99.98% for a simulated seawater solution of 3.5 wt% NaCl at 70 °C, while maintaining consistent desalination performance for 250 h.

Keywords

desalination / electrospinning / membrane distillation / metal organic frameworks / polyimide

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2024 The Author(s). Energy & Environmental Materials published by John Wiley & Sons Australia, Ltd on behalf of Zhengzhou University.