Sodium alkoxide-mediated g-C 3 N 4 immobilized on a composite nanofibrous membrane for preferable photocatalytic activity.

g-C 3 N 4 is a classic photocatalyst not only owing to the metal-free semiconducting electronic structure but also tunable multifunctional properties. However, strategies for chemical exfoliation of g-C 3 N 4 based on organic bases have been rarely reported. A family of sodium alkoxide-mediated g-C 3 N 4 has been prepared via a simple synthesis. The degradation rate of bulk g-C 3 N 4 is 39.8% when irradiation lasts 140 minutes. However, the degradation rate of g-C 3 N 4 -MeONa, g-C 3 N 4 -EtONa, and g-C 3 N 4 - t BuONa is 55.1%, 68.6%, and 79.1%, respectively, under the same conditions. Furthermore, g-C 3 N 4 - t BuONa has been immobilized on flexible electrospun PAN nanofibers to prepare floating photocatalysts. SEM analysis shows that the paper-based photocatalyst PAN/g-C 3 N 4 - t BuONa becomes a nanofiber membrane (A4 size, 210 mm × 297 mm). The nanofiber is approximately 350 nm in diameter. Interestingly, once synthesized, the g-C 3 N 4 - t BuONa particles move into the spinning solution, where the nanofiber wraps around them to form a monodisperse structure that resembles beads, or knots of 1-2 μm, on a string. The degradation efficiency of 10 mg L -1 MB solution can reach 100% for 2 hours until the solution becomes colorless. In addition, the photocatalytic mechanism studies have been validated. Different from H 2 SO 4 or HNO 3 , this work has proposed a facile strategy for designing preferable floating photocatalysts using sodium alkoxide.