▎ 摘　　要

NOVELTY - Preparing lanthanum modified graphene oxide hydrogel comprises (i) mixing the graphene oxide and lanthanum hydroxide in water uniformly to obtain the mixed solution, (ii) adding the mixed solution into the sodium alginate aqueous solution, and mixing uniformly to obtain the lanthanum-modified graphene oxide aqueous solution, and (iii) dripping the lanthanum-modified graphene oxide aqueous solution into the aqueous solution of the cross-linking agent for fully cross-linking to obtain the lanthanum-modified graphene oxide hydrogel, where in step (i), the mixing temperature is 65-85℃, and in step (ii), the mixing temperature is 40-50℃. USE - The lanthanum modified grapheme oxide hydrogel is useful in removing phosphorus in sewage (claimed). ADVANTAGE - The hydrogel formed by sodium alginate coats the graphene oxide loaded with lanthanum hydroxide, so that it can have good phosphorus adsorption effect in a wider pH range (pH is 3-10). DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for lanthanum-modified graphene oxide hydrogel prepared by above-mentioned method.