Preparation method and application of magnetic chitosan lignosulfonate graphene oxide adsorbent

The invention discloses a preparation method and application of a magnetic chitosan lignosulfonate graphene oxide adsorbent. The adsorbent comprises a graphene oxide matrix, and the surface of the matrix is grafted with a magnetic chitosan lignosulfonate complex and contains a large quantity of oxygen-containing functional groups and aromatic groups. The preparation method includes the steps that first, a graphene oxide solution and magnetofluid are prepared; then, magnetic chitosan and sodium lignosulphonate are compounded; next, graphene oxide and the magnetic chitosan lignosulfonate complex are combined, and washing, drying, grinding and screening are performed to obtain the final product. The product has an excellent adsorption effect on methylene blue dye, has the advantages of being wide in raw material source, low in cost, large in adsorption quantity, easy to separate and recycle, free of secondary pollution and the like and can be used for treating wastewater in printing and dyeing mills, chemical plants and the like.