▎ 摘　　要

NOVELTY - A graphene solar absorber comprises nano powder, dispersant, dispersed media, and pH adjuster in a ratio of 1-2:5:100:3. The nano powder is black nano-graphene particles. The dispersant is polyethylene glycol-4000. The dispersion medium is deionized water. The pH adjuster comprises formic acid and aqueous ammonia in a ratio of 1:1.5-3. USE - Graphene solar absorber for solar heat collecting system of solar water heater (all claimed). ADVANTAGE - The graphene solar absorber is prepared by simple process at low cost with excellent heat preservation effect, and solar energy absorption and utilization rate of 85-95%. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for production of graphene solar absorber, which involves adding 1-2 g black nano-graphene particles to 100 g dispersion medium, adding 0.4-0.6 %mass dispersant, adding formic acid and ammonia as a pH adjuster, and uniformly mixing.