The application discloses a kind of multilayer
biomass cellulose adsorption materials and its preparation method and application, belong to
biomass material and
sewage treatment technical field.The application first obtains PEI-
cellulose by polyethyleneimine modification to
biomass cellulose;Then PEI-cellulose and
chitosan are crosslinked to prepare
surface layer adsorption liquid;While unmodified biomass cellulose and
polyvinyl alcohol are mixed to prepare middle layer adsorption liquid;Finally, by layer
liquid nitrogen freeze forming,
freeze drying and alkali washing treatment, obtain the biomass cellulose adsorption material with sandwich multilayer structure.The multilayer adsorption material prepared by the application has positive
electricity on outer layer, can be efficiently adsorbed by electrostatic effect in water with negative
electricity micro / nano plastic;Middle layer is neutral, can be used to adsorb organic pollutants carried by micro / nano plastic.The material of the application is low in cost, simple in preparation process, fast in adsorption rate, high in removal rate and reusable, and has good application prospect in
water treatment field.