▎ 摘　　要

NOVELTY - A carbon black-graphene nano solar absorber comprises nanopowder, a dispersant, a dispersion medium and a pH adjusting agent in a mass ratio of 1-2:5:100:3. The nanopowder is black nano-carbon black-graphene particles. The dispersant is polyethylene glycol 4000. The dispersion medium is deionized water. The pH adjusting agent comprises formic acid and aqueous ammonia in a volume ratio of 1:1.5-3. USE - Carbon black-graphene nano solar absorber is used for manufacturing solar water heater and solar collector (all claimed). ADVANTAGE - The carbon black-graphene nano solar absorber has high solar energy absorption rate and utilization rate, and is economically prepared by simple process. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) preparation of carbon black-graphene nano solar absorber, which involves adding 1-2 g black nano-carbon black-graphene particles to 100 g dispersion medium, adding 0.4-0.6 %mass dispersant, and pH adjusting agent, and mixing; and (2) solar water heater manufactured using the carbon black-graphene nano solar absorber.