▎ 摘　　要

NOVELTY - A nanofiber membrane material is prepared by performing spray spinning using 6-11 wt.% graphene oxide, 7-10 wt.% p-phenolic fluoroboron dipyrrole, and PVP and PVA in a weight ratio of 5:1-25:1. The fiber has diameter of 60-500 nm, and specific surface area of 150-290 m2/g. USE - Nanofiber membrane material for filtering metallic ions (M3+) e.g. ferric ion, aluminum ion and chromic ion from industrial wastewater (all claimed). ADVANTAGE - The nanofiber membrane material has uniform fiber diameter distribution, and excellent filtration ability and adsorption to ferric ions, aluminum ions and chromium ions in industrial wastewater, due to the presence of p-phenolic fluoroboron dipyrrole having specific coordination recognition of ferric ions, aluminum ions and chromium ions. The membrane material is prepared using simple, economical and efficient method which provides thorough metallic ion removal, and is suitable for large-scale industrial production. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of the nanofiber membrane material, which involves vacuum drying PVP and PVA, adding to organic solvent comprising dimethyl sulfoxide, ethyl acetate, acetone or N,N-dimethylamide, ultrasonically stirring at 45 degrees C until homogeneously mixed, adding graphene oxide, ultrasonically stirring, adding p-phenolic fluoroboron dipyrrole, ultrasonically mixing to obtain polymer solution, metering polymer solution by metering pump, passing through spinneret, extruding the polymer spinning solution from spinneret hole, forming a fine flow and simultaneously spraying high-speed air jet stream at a pressure of 50-80 psi using jetting device, stretching to obtain PVP/PVA nanofibers deposited on substrate, and subjecting nanofibers to high-temperature heat stabilization treatment.