Method for separating nano cellulose from reeds

The invention relates to a method for separating nano cellulose from reeds. The method comprises the following steps: drying reeds at 80 DEG C to constant weight, pulverizing and screening; carrying out stirring hydrolysis on the cellulose raw material by using a sodium hydroxide solution; filtering the hydrolyzed precipitate, and bleaching with a bleacher to obtain cellulose; carrying out freeze-drying on the cellulose, and carrying out degradation and separation by using sulfuric acid to obtain nano cellulose; and centrifugating and cleaning for later use. The reeds in the natural world used as the raw material have the advantages of wide distribution, high growth speed and the like. Schistosomes can easily produce in the reeds, so that the method changes wastes into valuable substances; and the reeds used as the raw material can inhibit the breeding of insects. The method is efficient and sustainable. The sodium hydroxide hydrolysis can reduce the consumption of sulfuric acid in the later period; and the obtained nano cellulose has a certain dimensional range, and can be used in the fields of nano medicine, nano food and the like.