▎ 摘　　要

NOVELTY - A silver carbonate nanoball modified graphene oxide composite material comprises rod-shaped nano silver carbonate which is modified on a surface of graphene oxide through electrostatic self-assembly to form nanospheres with a particle size of 50-100 nm. USE - Silver carbonate nanoball modified graphene oxide composite material for photocatalytic degradation of organic contaminants such as phenol in waste water (all claimed). ADVANTAGE - The silver carbonate nanoball modified graphene oxide composite material has excellent stability, reusability and high efficient photocatalytic degradation of phenol, and avoids the problem of low catalytic activity. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) preparation method of silver carbonate nanoball modified graphene oxide composite material, which involves (1) adding surfactant cetyltrimethylammonium bromide solution into silver nitrate solution under dark condition, dripping sodium carbonate solution, magnetically stirring, uniformly mixing, transferring into a reactor, hydrothermally reacting, naturally cooling the to-be-product to room temperature, centrifugally washing with ethanol, and drying to obtain positively-charged nano-silver carbonate, and (2) ultrasonically dispersing negatively charged graphene oxide in ethylene glycol under dark condition, ultrasonically dispersing nano-silver carbonate obtained in the step (1) in distilled water, mixing, magnetically stirring, generating electrostatic effect to promote the self-assembling material reaction product, centrifugally washing with distilled water, and drying; and (2) use of silver carbonate nanoball modified graphene oxide composite material in photocatalytic degradation of organic contaminants in waste water.