▎ 摘　　要

NOVELTY - Preparing solar sea water desalting hydrogel comprises (i) adding glutaraldehyde solution into polyvinyl alcohol solution and mixing to obtain first mixed solution, (ii) adding persulfate solution into first mixed liquid to obtain second mixed liquid, and (iii) adding ultra-black absorbent solution into second mixed solution to mix to obtain pre-mixed reagent, where the pre-mixing reagent comprises a polyethylene glycol solution, a polypropylene glycol-based solution, an alcoholysis degree of 78-98%, and an ultra black absorbent, and USE - The method is useful for preparing solar seawater desalination hydrogel. ADVANTAGE - The method overcomes the disadvantages of long preparation time, low production efficiency and high production cost of the hydrogel prepared by chemical methods. The hydrogel is economical and effectively improves the light-to-heat conversion efficiency, and reduces environmental pollution. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for performing seawater desalination, comprising using the hydrogel prepared by the preparation method in a self-floating form to desalinate seawater by sunlight, where the thickness of the hydrogel is 2-50 mm, and the evaporation time is 1-14 hour/day. DESCRIPTION OF DRAWING(S) - The drawing shows a flow chart of preparing solar sea water desalting hydrogel (Drawing includes non-English language text).