Preparation method of nano cellulose fiber-sodium alginate-hydroxyapatite flame-retardant aerogel

The invention relates to the field of flame retardance, and in particular, relates to a preparation method of nano cellulose fiber-sodium alginate-hydroxyapatite flame-retardant aerogel; firstly, chemical pretreatment is carried out by taking lemon juice as an acidolysis agent, and nano cellulose fibers are extracted from pericarp waste pomelo peel by combining an efficient and low-consumption ball milling technology, so that the cost is low, and the preparation method is green and environment-friendly; the sodium alginate contains a large amount of hydroxyl carboxyl which can form a large amount of hydrogen bonds with cellulose and hydroxyapatite, and Ca on the surface of the hydroxyapatite has relatively good affinity with carboxylic acid groups; and the prepared nano cellulose fibers are compounded with hydroxyapatite and sodium alginate to prepare the flame-retardant aerogel which is efficient in flame retardance and does not cause harm to a human body and the environment according to the characterist