Mixed matrix membranes based on controllable synthesized one-dimensional HOFs for molecular separation

Hydrogen-bonded organic frameworks (HOFs), as a novel type of porous material formed by intermolecular hydrogen bonds, possess outstanding characteristics such as excellent solution processability and mild synthesis conditions, and exhibit great potential in the field of molecular separation. In this study, we synthesized one-dimensional needle-like HOF–F particles at low temperature through a simple method. These particles as fillers and cellulose acetate as polymer matrix were used to prepare HOF–F/CA mixed matrix membranes (MMMs). The MMMs were further applied in the field of molecular separation. A maximum interception rate of 99.1 % for dyes like Congo red was achieved, and a long-term separation of nearly 130 h could be maintained. Regarding per- and polyfluoroalkyl substances (PFAS) pollutants, the maximum interception rate could also reach 98.3 %. This research achievement has opened a new path for the practical application of HOFs in molecular separation and is expected to promote the further development of related fields.