Preparation of 3-dimensional mesoporous sodium alginate/graphene oxide composite aerogel for adsorption of methylene blue

In order to effectively remove dye from wastewater, sodium alginate/graphene oxide (SA/GO) compo-site hydrogel was prepared by one-step hydrothermal method using sodium alginate (SA) and graphene oxide (GO) as raw materials, and SA/GO composite aerogel was prepared by freeze drying. The synthesized products were characterized by FT-IR, XRD, SEM, TEM, N₂ adsorption-desorption and contact angel. The results show that the SA/GO composite aerogel is a porous material with three-dimensional structure, the specific surface area is about 580.54 m²·g⁻¹. The influence factors of SA/GO composite aerogel on the adsorption process of methylene blue (MB) solution are discussed. Under alkaline conditions, the adsorption effect is the best, the adsorption rate can reach 99.41%, the adsorption capacity can reach 248.53 mg·g⁻¹, and show excellent cyclic regeneration.