▎ 摘　　要

NOVELTY - Preparing superhydrophilic nickel-based multilayer composite membrane material comprises (1) dissolving nickel salt, sulfur-containing organic matter, complexing agent and surfactant in water to obtain sulfur-containing nickel electroplating solution, (2) using the metal carrier as the anode, cathode and sulfur-containing nickel electroplating solution jointly construct electrochemical working system, and depositing sulfur-containing nickel coating on the metal carrier to obtain metal carrier/sulfur-containing nickel coating composite structure, (3) soaking the metal carrier/sulfur-containing nickel coating composite structure in the first mixed aqueous solution, and (4) soaking the metal carrier/sulfur-containing nickel coating/hybrid Prussian blue layer composite structure in aqueous calcium salt solution, and obtaining composite structure of metal carrier/sulfur-containing nickel coating/hybrid Prussian blue layer/hybrid hydrogel layer. USE - The material is useful in field of photothermal seawater desalination or photothermal sewage purification (claimed). ADVANTAGE - The material: has complementary and multi-functional coupling; and forms bottom-up super-hydrophilic four-layer composite material, which can be used in photothermal seawater desalination, photothermal sewage purification and other fields. DETAILED DESCRIPTION - Preparing superhydrophilic nickel-based multilayer composite membrane material comprises (1) dissolving nickel salt, sulfur-containing organic matter, complexing agent and surfactant in water to obtain sulfur-containing nickel electroplating solution, (2) using the metal carrier as the anode, cathode and sulfur-containing nickel electroplating solution jointly construct electrochemical working system, energizing the electrochemical working system, performing electrodeposition reaction, and depositing sulfur-containing nickel coating on the metal carrier to obtain metal carrier/sulfur-containing nickel coating composite structure, (3) soaking the metal carrier/sulfur-containing nickel coating composite structure in the first mixed aqueous solution composed of iron salt, polyvinylpyrrolidone, hydrochloric acid and carbon quantum dots, reacting to generates hybrid Prussian blue layer, and obtaining metal carrier/sulfur-containing nickel coating/hybridized Prussian blue layer composite structure, and (4) soaking the metal carrier/sulfur-containing nickel coating/hybrid Prussian blue layer composite structure in aqueous calcium salt solution, taking it out and soaking it in the second mixed aqueous solution composed of mixed dimensional nanomaterials, sodium alginate and gelatin, performing heat treatment to form hybrid hydrogel layer, and obtaining composite structure of metal carrier/sulfur-containing nickel coating/hybrid Prussian blue layer/hybrid hydrogel layer, i.e. superhydrophilic nickel-based multilayer composite membrane material.