▎ 摘　　要

NOVELTY - Preparing fiber membrane for removing antibiotics from medicinal wastewater comprises e.g. ultrasonically dispersing graphene oxide in water, adding ferric chloride and ferrous chloride, introducing nitrogen gas, heating, and stirring; (2) adding aqueous ammonia to solution obtained in step (1) to adjust pH, maintaining temperature, filtering resulting precipitate, washing with water, and drying under vacuum to obtain graphene adsorbent material; (3) dissolving chitosan in isopropyl alcohol solution, slowly adding sodium hydroxide to the total mass of the solution, heating, stirring and alkalifying, adding 2-3 times the mass of chloroacetic acid of chitosan, continuously reacting, adding aqueous silver nitrate solution, heating, adding ethanol to precipitate, filtering, collecting and drying to obtain modified chitosan; (4) mixing beta -cyclodextrin, polyacrylic acid, citric acid, graphene adsorbent obtained in step (2), and N,N-dimethylformamide, magnetic stirring, and heating. USE - The method is useful for preparing fiber membrane for removing antibiotics from medicinal wastewater. ADVANTAGE - The fiber membrane: can effectively adsorbs large amount of antibiotic residues in medicinal wastewater through conjugation, hydrogen bonding, and electrostatic action. DETAILED DESCRIPTION - Preparing fiber membrane for removing antibiotics from medicinal wastewater comprises (1) ultrasonically dispersing graphene oxide in 95-100 times mass of water, adding ferric chloride and ferrous chloride, introducing nitrogen gas, and heating to 50-60 degrees C, and stirring for 5-10 minutes; (2) adding aqueous ammonia to solution obtained in step (1) to adjust pH to 9.5-10.5, maintaining temperature at 55-65 degrees C for 90-120 minutes, filtering resulting precipitate, washing with water, and drying under vacuum to obtain graphene adsorbent material; (3) dissolving chitosan in isopropyl alcohol solution at solid-liquid ratio of 1:15-18 g/ml, slowly adding 1-2 wt.% sodium hydroxide to the total mass of the solution, heating to 55-65 degrees C, stirring and alkalifying for 60-80 minutes, adding 2-3 times the mass of chloroacetic acid of chitosan, continuously reacting for 4-5 hours, adding aqueous silver nitrate solution, heating at 55-65 degrees C for 24-48 hours, adding ethanol to precipitate, filtering, collecting and drying to obtain modified chitosan; (4) mixing beta -cyclodextrin, polyacrylic acid, citric acid, graphene adsorbent obtained in step (2), and N,N-dimethylformamide in the mass ratio of (15-16): (3-4): (3- 4): (2-3): (75-80), magnetic stirring for 5-6 hours, heating to 60-65 degrees C, adding modified chitosan obtained in step (3) at solid-liquid ratio of 1-4.5 mg/ml, mixing, allowing to stand for 10-12 hours, spinning the solution, thermally crosslinking obtained spun fiber membrane at 150-180 degrees C for 120-150 minutes to obtain fiber membrane; and (5) immersing fiber membrane obtained in the step (4) in 18-22% potassium hydroxide solution, squeezing, dehydrating and drying to obtain fiber membrane.