Method for preparing size-controllable nanocellulose aerogel microspheres

The invention provides a method for preparing size-controllable nanocellulose aerogel microspheres, which is characterized in that in a cellulose nanocrystal suspension with certain concentration, a certain amount of silane coupling agent capable of hydrolyzing and cross-linking cellulose is used for surface modification of nanocellulose to obtain nanocellulose with a cross-linked structure; dropwise adding the suspension liquid into liquid nitrogen in a manner of externally applying electrostatic voltage to form frozen cellulose microspheres, and performing freeze drying to obtain the nano cellulose aerogel microspheres. The nanocellulose aerogel microsphere has a controllable macroscopic size and a microcosmic internal nanowire-shaped structure, also has a microcosmic porous structure similar to aerogel, can be used for adsorbing dyes or heavy metal ions in wastewater, and has a wide application prospect in the current fields of water treatment, drug sustained release and the like. 本发明提出了一种制备可控尺寸纳米纤维素气凝胶微球的