【摘要】An ammoniated PAN nanofibers (PAN-NH2) absorbent was prepared by grafting amino hyperbranched polymer (HBP-NH2) onto polyacrylonitrile (PAN) nanofiber in presence of glutaraldehyde as a crosslinking agent. The structure and performance of  PAN-NH2 were characterized. The results indicated that HBP-NH2 was successfully grafted onto PAN nanofibers surface by chemical crosslinking modification; PAN-NH2 nanofiber provided the adsorption capacity up to 28.02 mg/g while used as an absorbent in the treatment of water containing Cu2+ ; and the amino mass fraction of PAN-NH2 fiber was 5.4%.