A series of SEG/ZnO photocatalysts with different ratios of Zn(NO3)(2) precursor was synthesized via a facile chemical deposition-calcination approach using solvent exfoliated graphene (SEG) as a precursor of graphene, Zn(NH3)(4)CO3 as a precursor of ZnO, NaOH as a precipitating agent, and poly(vinylpyrrolidone) as an interface linker. The photocatalytic activity and stability of SEG/ZnO were evaluated by the degradation of Reactive Black 5 (RB5) under visible light. In comparison to pure SEG and ZnO, SEG/ZnO nanocomposites displayed a remarkable RB5 degradation of 97.0% with a rate constant of 0.0199 min1 under a low-power 15 W energy-saving light bulb for 3 h. The optimum ZnO content was 69.0 wt %, which demonstrated a 10-fold enhancement after graphene hybridization than that for pure ZnO. This was accredited to effective dye sensitization and suppressed electronhole recombination via SEG as electron storage. Lastly, a visible-light photocatalytic mechanism for the photoactivity was explored.