2D/2D Covalent triazine-based heterostructure membrane for highly enhanced photoactivity and anti-fouling ability

Abstract 2D/2D heterostructure membrane of covalent triazine frameworks@TiO2 fibrous membrane (CTFs@TiO2) was rationally designed through the combination of hydrothermal reaction and vapor-catalyzed in situ polymerization. Structure and composition characterization have confirmed that tiny 2D CTFs flakes were firmly anchored on TiO2 nanosheets forming porous heterojunction architecture. The introduction of CTFs could be quantitatively optimized, and thus offered the heterojunction system with considerable mesopores and strong interfacial interaction with TiO2, boosting efficient charge transfer and tetracycline degradation under visible light and sunlight. Moreover, this heterostructure membrane possessed superior anti-fouling property benefitted from hydrophilicity, increased surface roughness, and self-cleaning ability. It is believed that this 2D/2D CTFs@TiO2 heterostructure membrane reveals a promising future in environment remediation.