▎ 摘　　要

NOVELTY - Preparing adsorbent comprises (i) mixing the polyvinylpyrrolidone, ammonium molybdate tetrahydrate, thiourea and water for reacting, vacuum freezing and drying to obtain molybdenum disulfide; (ii) immersing the melamine foam in a mixed solution of the graphene oxide, molybdenum disulfide and sodium ascorbate for reaction, vacuum freezing and drying to obtain molybdenum disulfide/reduced graphene oxide/melamine foam; and (iii) soaking the molybdenum disulfide/reduced graphene oxide/melamine foam in sodium alginate solution and calcium chloride solution for crosslinking reaction, vacuum freezing and drying. USE - The method is useful for preparing adsorbent is useful in removing silver (I) ion in wastewater (claimed) and fixing molybdenum disulfide by multi-level network with different components. ADVANTAGE - The method: utilizes the self-assembly characteristics of graphene oxide; reduces graphene oxide through a one-step method thus immobilizes molybdenum disulfide in three-dimensional reduced graphene oxide and loads in melamine foam with a macroporous network structure, and building a layer of calcium ion cross-linked sodium alginate network on the surface of molybdenum disulfide/reduced graphene oxide/melamine foam to avoid the shedding of molybdenum disulfide and reduced graphene oxide thus molybdenum disulfide contains rich sulfur groups and sulfur vacancies which provide a large number of active sites for the adsorption of silver ion (I) in aqueous solution; and has excellent adsorption performance on silver ion, where part of silver (I) combined with sulfur to form silver sulfide and the other part is reduced to simple silver. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for adsorbent, prepared as mentioned above.