Ultra‐Fast Preparation of Large‐Area Graphdiyne‐Based Membranes via Alkynylated Surface‐Modification for Nanofiltration

Abstract

AbstractGraphdiynes (GDYs), two‐dimensional graphene‐like carbon systems, are considered as potential advanced membrane material due to their unique physicochemical features. Nevertheless, the scale‐up of integrated GDY membranes is technologically challenging, and most studies remain at the theoretical stage. Herein, we report a simple and efficient alkynylated surface‐mediated strategy to prepare hydrogen‐substituted graphdiyne (HsGDY) membranes on commercial alumina tubes. Surface alkynylation initiates an accelerated surface‐confined coupling reaction in the presence of a copper catalyst and facilitates the nanoscale epitaxial lateral growth of HsGDY. A continuous and ultra‐thin HsGDY membrane (∼100 nm) can be produced within 15 min. The resulting membranes exhibit outstanding molecular sieving together with excellent water permeances (ca. 1100 L m−2 h−1 MPa−1), and show a long‐term durability in cross‐flow nanofiltration, owing to the superhydrophilic surface and hydrophobic pore walls.