Porous sodium alginate/cellulose nanofiber gel microspheres as well as preparation method and application thereof

The invention provides a porous sodium alginate/cellulose nanofiber gel microsphere and a preparation method and application thereof, and belongs to the technical field of preparation of heavy metal ion adsorbents, the preparation method comprises the following steps: adding polyethylene glycol and sodium alginate into an aqueous dispersion of cellulose nanofibers, stirring and dissolving to obtain a solution A; an aqueous solution of sodium alginate/cellulose nanofiber/polyethylene glycol is obtained; the preparation method comprises the following steps: mixing a sodium alginate/cellulose nanofiber/polyethylene glycol aqueous solution and an oil phase through a micro-fluidic chip to obtain a water-in-oil emulsion; and outputting the water-in-oil emulsion into a stirred CaCl2 solution, reacting, washing, and freeze-drying to obtain the dried porous sodium alginate/cellulose nanofiber gel microspheres. The prepared gel microspheres have high adsorption rate and adsorption capacity on heavy metal ions, and have