▎ 摘　　要

NOVELTY - Preparing composite fibre film comprises adding graphene oxide (GO) into deionized water, carrying out ultrasonic dispersion and stirring uniformly, adding dopamine hydrochloride, stirring, and reacting, filtering, washing and drying to obtain the modified graphene, (2) adding polyvinyl alcohol (PVA) into deionized water, heating, stirring and dissolving, then adding the modified graphene in the step (1), stirring, and then moving to an injection pump, adding cotton fibers into deionized water, then carrying out ultrasonic soaking , adding sodium hydroxide, modulating the concentration of the sodium hydroxide aqueous solution, oscillating and stirring, filtering, and washing, adding the cotton fiber into a sodium periodate solution, carrying out an oscillation reaction under a dark condition, taking out the sample, adding the sample into glycerol, carrying out oscillation treatment, taking out the sample, washing the sample with deionized water. USE - The composite fibre film is useful for treating heavy metal ion in sewage (claimed). DETAILED DESCRIPTION - Preparing composite fibre film comprises (1) adding graphene oxide (GO) into deionized water, carrying out ultrasonic dispersion and stirring uniformly, adding dopamine hydrochloride, stirring, adjusting the pH value to 10.5-11.8, stirring and reacting for 30-60 minutes, filtering, washing and drying to obtain the modified graphene, (2) adding polyvinyl alcohol (PVA) into deionized water, heating to 80-90degrees Celsius, stirring and dissolving, then adding the modified graphene in the step (1), stirring for 50-80 minutes, and then moving to an injection pump for later use, (3), adding cotton fibers into deionized water, then carrying out ultrasonic soaking for 20-30 minutes, adding sodium hydroxide, modulating the concentration of the sodium hydroxide aqueous solution to be 90-120 mg/ml, oscillating and stirring for 2-4 hours, filtering, and washing for 4-6 times with deionized water, (4) adding the cotton fiber obtained in the step (3) into a sodium periodate solution, carrying out an oscillation reaction at 50-60degrees Celsius for 3-6 hours under a dark condition, taking out the sample, adding the sample into glycerol, carrying out oscillation treatment for 1.5-2 hours, taking out the sample, washing the sample with deionized water, and after drying, weaving the cotton fiber film with the thickness of 0.05-0.12 mm into the cotton fiber membrane with the thickness of 0.05-0.12 mm, (5), the injection pump in the step (2) is installed on the high-pressure electrostatic spinning device, then electrostatic spinning is carried out, spun silk is received on the surface of the cotton fiber obtained in the step (4) to obtain a composite film, then the composite membrane is flatly laid on the culture dish, adding amino-terminated hyperbranched polymer (HBP-NH2) after slight shaking of deionized water, then the composite membrane is taken out after being shaken at 55-65degrees Celsius for 7-10 hours and the composite fiber membrane is obtained.