Preparation of ultrafine fibrous membranes containing graphitic carbon nitride composited photocatalyst and their degradation of methylene blue under visible light

Photocatalytic dye degradation technology is an energy-saving, environmentally friendly and sustainable technology, so that it has been extensively studied. In this study, the TiO₂/Zeolite-Y/g-C₃N₄ photocatalyst was prepared by the sol–gel method, and nanofibrous membranes containing the photocatalyst was prepared by the electrospraying combined electrospinning technology for dye wastewater treatment. The nanofibrous membranes containing photocatalyst can be easily removed from dye wastewater compared with the use of the photocatalyst without nanofibrous membranes. The methylene blue (MB) adsorption efficiency of 79.16% by TiO₂/Zeolite-Y/g-C₃N₄(0.3) photocatalyst under dark environment for 180 min, which is significantly higher than P25 (6.13%). Moreover, the TiO₂/Zeolite-Y/g-C₃N₄(0.3) photocatalyst has the highest MB removal efficiency (90.74%) under visible light for 180 min, which is significantly higher than P25 (7.51%). Finally, the MB removal efficiency of the TiO₂/Zeolite-Y/g-C₃N₄ / Nylon 6,6 nanofibrous membranes under visible light is higher than that of the pure Nylon 6,6 nanofibrous membrane, which proves that the composited photocatalyst is successfully combined with the nanofibrous membrane, and can effectively remove MB.