Column‐to‐Beam Structure House Inspired MXene‐Based Integrated Membrane with Stable Interlayer Spacing for Water Purification

Abstract Ti 3 C 2 T x (MXene) displays prominent properties in water purification due to its rich surface chemistry and physicochemical property. However, the separation property is severely restrained because of the intercalation‐induced swelling. Inspired by the column‐to‐beam structure house, an advanced MXene‐based membrane is developed with a stable interlayer spacing for water purification. Laminar Ti 3 C 2 T x nanosheets with numerous nanochannels are set as the “beam” part, and the boron nitride (BN) nanosheets are thought of as the “brick” part of the MXene‐based integrated membrane. Moreover, the Ti 3 C 2 T x nanosheets form stable interactions with the BN nanosheets through covalent cross‐linking and supramolecular hydrogen bonding. Furthermore polydopamine and polyethylenimine assume the roles of the “column” part of this membrane through covalent cross‐linking interaction. Therefore, this membrane shows outstanding anti‐swelling property with a stable interlayer spacing of 14.7 ± 0.13 Å after 600 h immersion in water, which is superior to that of most previously reported works. In addition, its hydrophilic functional groups and charges endow itself with exceptional anti‐fouling ability. This work may offer a promising manner to construct advanced separation materials with a stable structure for precise water purification.