▎ 摘　　要

NOVELTY - Preparing polyvinyl alcohol/graphene oxide/manganese dioxide adsorbent, comprises e.g. mixing polyvinyl alcohol and manganese acetate tetrahydrate in water, heating at 50-100 degrees C, and stirring for 3-10 hours to obtain crosslinking agent solution, adding cross-linking agent into 4-12 mg/ml graphene oxide dispersion (diluted and prepared from purchased stock solution), and vibrating to promote gelation to obtain polyvinyl alcohol/graphene oxide/divalent manganese ion hydrogel, freeze-drying the polyvinyl alcohol/graphene oxide/divalent manganese ion hydrogel at -80 to -60 degrees C for 12-48 hours to obtain polyvinyl alcohol/graphene oxide/divalent manganese ion xerogel, dipping polyvinyl alcohol/graphene oxide/divalent manganese ion xerogel in potassium permanganate solution, stirring at room temperature, and stirring at 50-200 revolutions per minute for 3-12 hours to obtain polyvinyl alcohol/graphene oxide/manganese dioxide hydrogel, and washing and freeze drying. USE - The polyvinyl alcohol/graphene oxide/manganese dioxide adsorbent is useful for removing nuclides (strontium ion) in wastewater (claimed). ADVANTAGE - The method is simple and efficient, and easy separation. The adsorbent has adsorption performance for removal of radioactive strontium ions in nuclear waste water. DETAILED DESCRIPTION - Preparing polyvinyl alcohol/graphene oxide/manganese dioxide adsorbent, comprises (i) mixing polyvinyl alcohol and manganese acetate tetrahydrate in water, where the mass percentage between polyvinyl alcohol, manganese acetate tetrahydrate and water is 0.01-0.04:0.02-0.08:1, heating at 50-100 degrees C, and stirring for 3-10 hours to obtain crosslinking agent solution, (ii) preparing 1-4 wt.% potassium permanganate solution by using potassium permanganate solid powder, (iii) adding cross-linking agent into 4-12 mg/ml graphene oxide dispersion (diluted and prepared from purchased stock solution), where the dropping ratio between crosslinking agent and graphene oxide dispersion is 0.02-1:1, and vibrating to promote gelation to obtain polyvinyl alcohol/graphene oxide/divalent manganese ion hydrogel, (iv) freeze-drying the polyvinyl alcohol/graphene oxide/divalent manganese ion hydrogel at -80 to -60 degrees C for 12-48 hours to obtain polyvinyl alcohol/graphene oxide/divalent manganese ion xerogel, (v) dipping polyvinyl alcohol/graphene oxide/divalent manganese ion xerogel in potassium permanganate solution, stirring at room temperature, and stirring at 50-200 revolutions per minute for 3-12 hours to obtain polyvinyl alcohol/graphene oxide/manganese dioxide hydrogel, and (vi) washing the polyvinyl alcohol/graphene oxide/manganese dioxide hydrogel prepared in step (v) until the eluent is colorless and the pH test is neutral, and freeze drying at -80 to -60 degrees C for 12-48 hours to obtain final product. An INDEPENDENT CLAIM is also included for use of polyvinyl alcohol/graphene oxide/manganese dioxide adsorbent for removing nuclides (strontium ion) in wastewater, comprising (a) adding polyvinyl alcohol/graphene oxide/manganese dioxide adsorbent into nuclear wastewater containing strontium ion to make the mixing ratio of the quality of the adsorbent and the volume of nuclear waste water to 0.40-4 g/l to obtain mixed solution, and (b) reacting for 6-24 hours, filtering and determining the mass concentration of residual strontium ion, and transferring strontium ion from the liquid to the surface of the solid polyvinyl alcohol/graphene oxide/manganese dioxide adsorbent, and gradually reducing the residual concentration of the solution to remove strontium ion in the nuclear wastewater.