▎ 摘　　要

NOVELTY - Bionic fiber functional material is rich in multiple adsorption sites, that is, N, O, and S sites that have adsorption properties for heavy metal ions. The material is made by blending polyethyleneimine polymer modified by three multifunctional groups with carboxylated nanocellulose and graphene oxide, and then adopting a coaxial spinning method based on the principle of imitating spider spinning. Obtained by post-crosslinking technology. The material has a multilayer structure with nanocellulose as the skeleton, graphene oxide as the outer layer, and polyethyleneimine polymer modified by three multifunctional groups as the inner layer, and the connection between the layers is a chemical bond connection. The polyethyleneimine polymers modified by the three multifunctional groups are respectively a polyethyleneimine polymer modified with ethylenedithiodiacetic acid containing N and S sites, and a polyethyleneimine polymer modified with N and O sites. USE - Bionic fiber functional material used in low concentration heavy metal ion adsorption. The N, O, and S adsorption site density of the material are all higher than 5m mol l/g, which can realize the simultaneous, rapid and complete removal of multiple heavy metal ions. ADVANTAGE - The N, O, and S adsorption site density of the material are all higher than 5mmmol/g. DETAILED DESCRIPTION - Bionic fiber functional material is rich in multiple adsorption sites, that is, N, O, and S sites that have adsorption properties for heavy metal ions. The material is made by blending polyethyleneimine polymer modified by three multifunctional groups with carboxylated nanocellulose and graphene oxide, and then adopting a coaxial spinning method based on the principle of imitating spider spinning. Obtained by post-crosslinking technology. The material has a multilayer structure with nanocellulose as the skeleton, graphene oxide as the outer layer, and polyethyleneimine polymer modified by three multifunctional groups as the inner layer, and the connection between the layers is a chemical bond connection. The polyethyleneimine polymers modified by the three multifunctional groups are respectively a polyethyleneimine polymer modified with ethylenedithiodiacetic acid containing N and S sites, and a polyethyleneimine polymer modified with N and O sites. The hyperbranched polycarboxylic acid-modified polyethyleneimine polymer and dopamine-modified polyethyleneimine polymer containing O and N sites. The dopamine-modified polyethyleneimine polymer containing O and N sites is obtained by modifying polyethyleneimine with polycarboxylic acid and dopamine. The carboxylated nanocellulose is obtained by oxidizing biomass fiber by TEMPO/NaBr/NaClO oxidation system.