▎ 摘　　要

NOVELTY - Preparation of compression-resistant hydrophilic aerogel involves (a) preparing mixed solution of sodium alginate and graphene oxide and then ultrasonically stirring until it is uniform, (b) adding an aqueous solution of calcium chloride to the mixed solution, leaving, taking out obtained hydrogel and then placing in deionized water, leaving, replacing deionized water every 3 hours and repeating replacement of deionized water until conductivity of water is not increased, and (c) pre-freezing hydrogel and freeze-drying to obtain compression-resistant hydrophilic aerogel. USE - Method is useful for preparing compression-resistant hydrophilic aerogel, which is useful as forward osmosis draw component for sewage or brackish water purification process, as hydration bag in portable forward osmosis water purification device and for military and emergency rescue (all claimed). ADVANTAGE - The compression-resistant hydrophilic aerogel can be prepared under mild reaction conditions in a simple and economical manner with less energy consumption, low toxicity and excellent membrane compatibility. DETAILED DESCRIPTION - Preparation method of compression-resistant hydrophilic aerogel involves (a) preparing mixed solution of sodium alginate and graphene oxide and then ultrasonically stirring until it is uniform, (b) adding an aqueous solution of calcium chloride to the mixed solution, leaving at room temperature for 24-48 hours, taking out obtained hydrogel and then placing in deionized water, leaving at room temperature, replacing deionized water every 3 hours and repeating the replacement of the deionized water until conductivity of deionized water is not increased, (c) pre-freezing the obtained hydrogel at -25 degrees C to -15 degrees C for 2-4 hours and freeze-drying the frozen hydrogel at -60 degrees C to -90 degrees C for 24-48 hours to obtain compression-resistant hydrophilic aerogel, and (d) taking compression-resistant hydrophilic aerogel as forward osmosis draw component for sewage or brackish water purification process. The mass ratio of sodium alginate and graphene oxide is 100:1-8:1. The concentration of graphene oxide is 0.2-2.5 mg/ml. The molar ratio of calcium chloride and sodium alginate is 1-3:1.