▎ 摘　　要

NOVELTY - Nano fibrous membrane, is claimed. It is prepared by electro-spinning, and the nanofiber membrane realizes photocatalytic degradation of ethylene under visible light irradiation, the nanofiber membrane is a modified titanium dioxide nanofiber membrane, and the modified titanium dioxide nanofiber membrane reduces the titanium dioxide energy band gap by doping particles, and realizes the ability of visible light catalytic degradation of ethylene, the doped particles in the modified titanium dioxide nanofiber membrane comprises at least one of silver nanoparticles, cobalt nanoparticles, zinc nanoparticles and zinc oxide nanoparticles. The nanoparticles with visible light catalytic degradation of ethylene loaded on the nano fibrous film comprises at least one of graphite-phase carbon nitride nanoparticles, graphene oxide nanoparticles, and nitrided graphene oxide nanoparticles. USE - The nano fibrous membrane is useful for catalyzing the degradation of ethylene by visible light. Can also be useful in reusable visible light catalytic device for delaying postharvest ripening of fruits and vegetables. ADVANTAGE - The nano fibrous membrane film has large specific surface area, high porosity, effectively improves ethylene catalytic degradation efficiency, delays maturity of fruit and vegetable. The device has air circulation module, which accelerates collision probability of the gas molecule and nano fibrous membrane. DETAILED DESCRIPTION - Nano fibrous membrane useful for catalyzing the degradation of ethylene by visible light, is claimed. It is prepared by electro-spinning, and the nanofiber membrane realizes photocatalytic degradation of ethylene under visible light irradiation, the nanofiber membrane is a modified titanium dioxide nanofiber membrane, and the modified titanium dioxide nanofiber membrane reduces the titanium dioxide energy band gap by doping particles, and realizes the ability of visible light catalytic degradation of ethylene, or by loading nanoparticles with the ability to catalytically degrade ethylene with visible light on the nano fibrous membrane, the doped particles in the modified titanium dioxide nanofiber membrane comprises at least one of silver nanoparticles, cobalt nanoparticles, zinc nanoparticles and zinc oxide nanoparticles. The nanoparticles with visible light catalytic degradation of ethylene loaded on the nano fibrous film comprises at least one of graphite-phase carbon nitride nanoparticles, graphene oxide nanoparticles, and nitrided graphene oxide nanoparticles, where the diameter of the nanofiber membrane is 100-200 nm, the rate of air passing through the nanofiber membrane under constant pressure difference of 100 Pa is ≯ 200 mm/second, and the tensile strength of the nanofiber membrane is 50-150 MPa. INDEPENDENT CLAIMS are also included for: preparation method of the nano fibrous membrane loaded with nanoparticles for catalytically degrading ethylene with visible light, comprising adding at least one of graphite phase carbon nitride nanoparticles, graphene oxide nanoparticles, and nitrided graphene oxide nanoparticles, where the diameter of the nanoparticles is 100 nm, the mass fraction of the nanoparticles in the spinning solution is 10-15%, and preparing nano fibrous membranes by electro-spinning, where the voltage for controlling electro-spinning is 50-70 kV, the flow rate of spinning solution is 0.08 mm/minutes, the receiving distance is 18 cm, the temperature is 25-28℃, the humidity is 25-30%, the spinning time is 3 minutes, and the receiving substrate is non-woven fabric; and a reusable visible light catalytic device for delaying postharvest ripening of fruits and vegetables, comprising nano fibrous membrane and air circulation module with visible light catalytic degradation ethylene ability, the air circulation module comprises a fan and a ventilation duct, the fan is arranged at one end of the ventilation duct, the nano fibrous membrane with the ability of visible light catalytic degradation of ethylene is covered and arranged at the other end of the ventilation duct, after the fan is turned on, the ambient air passes through the nano fibrous membrane at a high flux of 200-350 mm/seconds to achieve efficient photocatalytic degradation of ethylene.