▎ 摘　　要

NOVELTY - Modified polyacrylonitrile fiber film is claimed. The modified polyacrylonitrile fiber film is prepared by (i) adding polyacrylonitrile, chitosan, biochar and thioacetamide into solvent A, stirring ultrasonically for 30-50 minutes to obtain mixture I, where the mass ratio of polyacrylonitrile, chitosan, biochar and thioacetamide is 1:0.55-0.9:0.4-0.6:0.3-0.7, (ii) adding dopamine and graphene oxide into solvent B, stirring ultrasonically for 20-30 minutes to obtain mixture II, where the mass ratio of dopamine and graphite oxide is 1:0.23-0.45 and (iii) adding mixture II into mixture I, stirring, then adding ascorbic acid and 3% tris-buffer, stirring for 20 minutes to obtain spinning solution, transferring into electrospinning syringe pump and electrospinning to obtain final product, where the molar ratio of ascorbic acid to 3% tris-buffer is 0.1:0.06-0.09. USE - The modified polyacrylonitrile fiber film is useful for absorbing lead ion in water (claimed). ADVANTAGE - The modified polyacrylonitrile fiber film: has good removing rate to lead ion in water, the removing rate of the lead ion up to more than 95% even after circulating test ten times.