Multiple functional groups-containing modified nanocellulose and preparation method thereof

The invention relates to multiple functional groups-containing modified nanocellulose and a preparation method thereof. The preparation method comprises the following steps: mixing binary weak acid with water, then adding carboxymethyl cellulose powder, centrifuging the mixed solution to obtain a solid mixture, adding water and alkaline for neutralizing and then standing and centrifuging; adding water into the solid for washing and centrifuging to obtain a solid product, standing and layering the solid product in water, removing water from superstratum suspension to obtain multiple functional groups-containing modified nanocellulose crystal whiskers, diluting substratum solid precipitate with water, and then homogenizing to obtain the multiple functional groups-containing modified nanocellulose. The nanocellulose CMNW and CMNFs can be prepared by taking carboxymethyl cellulose as a raw material, the range of the nanocellulose preparation raw materials can be extended, the nanocellulose can be prepared by hydr