Bioinspired Nanoporous MOF-Modified Basalt Fiber Fabrics for Efficient and Multifunctional Oil–Water Separation

Abstract

Oily wastewater pollution is increasing globally. Conventional treatment methods often fail due to inefficiency and secondary contamination. Therefore, developing advanced membrane separation technologies is crucial. While membrane separation technology holds promise as a solution, its widespread applicability necessitates overcoming significant obstacles related to corrosion resistance, alkali resistance, and the prevention of membrane fouling. This study presents a novel and highly efficient approach for oil–water separation, employing bioinspired, nanoporous metal–organic framework-modified basalt fiber fabrics (BFF). The integration of UiO-66-NH₂, renowned for its high porosity and tunable functionalities, with a chitosan-dopamine (CS-DA) layer on BFFs creates a multifunctional membrane with enhanced hydrophilicity and underwater superoleophobicity. This bioinspired design (refers to engineering solutions that mimic natural structures or mechanisms to improve performance and efficiency), drawing inspiration from the structure and function of natural materials, results in superior oil–water separation performance, demonstrating excellent flux and oil rejection rates. The UiO-66-NH₂ effectively captures oil droplets due to its high porosity, while the CS-DA layer facilitates water permeability and promotes surface stability. Furthermore, the composite membrane exhibits exceptional stability and reusability, positioning it as a promising candidate for efficient and sustainable oil–water separation applications. This research showcases the potential of bioinspired design principles for developing innovative solutions to pressing environmental challenges.