▎ 摘　　要

Sodium alginate graft poly (acrylic acid-co-2-acrylamide-2-methyl propane sulfonic acid)/graphene oxide (SA-g-P(AA-co-AMPS)/GO) hydrogel composite is prepared. The composite is characterized by infrared (IR) spectroscopy, X-ray diffraction (XRD), high-resolution scanning electron microscope (HRSEM), and differential scanning calorimetry (DSC). The swelling properties of the composite are investigated. GO acts as part of the cross-linking points, which improves the swelling property of the composite. Maximal amount of absorption capacity in water and 0.9% NaCl is 862.3 and 164.7 g/g, respectively, with a GO content of 5 wt% of total mass of monomers. However, the absorption of water and 0.9% NaCl is only 390.3 and 52.5 g/g, respectively, without the incorporation of GO. Water retention properties of the composite are also tested.