▎ 摘　　要

NOVELTY - Graphene-coated zinc oxide nanocomposites are prepared by (1) filtering cyanobacteria from water, centrifuging to obtain cyanobacterial cells, and suspending cyanobacteria cells in pure water; (2) immersing cyanobacteria cells in glutaraldehyde aqueous solution to obtain cyanobacteria suspension and storing in refrigerated state; (3) separating cyanobacteria suspension into solid and liquid, suspending in pure water to obtain pretreated cyanobacteria, uniformly mixing zinc acetate or zinc nitrate, pretreated cyanobacteria, and triethanolamine, adjusting pH to 8-10 to obtain a reaction system, placing reaction system at 80-100 degrees C for 2-6 hours, cooling to room temperature, aging to obtain aged liquid, solid-liquid separating, and washing and drying to obtain precursor; and (4) dispersing precursor into pure water, reacting at 180-210 degrees C for 12-48 hours, solid-liquid separating, and washing and drying. USE - Preparation of graphene-coated zinc oxide nanocomposites using cyanobacteria. ADVANTAGE - The prepared nanocomposite has a large specific surface area and good photoelectric properties.