Construction of Micro-crumpled Nanofiltration Membranes based on Metal Organic Frameworks Interlayers and Their Efficacy in Water Treatment

Surface chemistry, morphology, and network architecture jointly of nanofiltration (NF) membranes significantly influence their water treatment performance. Within these levers, constructing micro-crumpled polyamide (PA) skins has emerged as a promising tactic to simultaneously enhance permeability, selectivity, and fouling resistance. Based on this, the strategy of introducing metal-organic framework (MOFs) materials as an intermediate layer to construct micro-crumpled structures offers a novel approach to addressing the traditional trade-off between permeability and selectivity in nanofiltration membranes. However, the strategies, mechanisms, and effects of using MOF intermediate layers have not yet been systematically summarized. This paper explores the influencing factors in preparing micro-crumpled nanofiltration membranes based on MOFs interlayers. It reviews different preparation methods and their mechanisms, focusing on how the nature and introduction mode of MOFs affect the micro-crumpled structure and modulation mechanism. Additionally, it examines the influence of the micro-crumpled selective layer on the permeability, selectivity, and anti-contamination performance of nanofiltration membranes. Finally, it outlines the current research shortcomings and envisions future research directions and objectives for using MOFs interlayers to construct micro-crumpled nanofiltration membranes.