One-step synthesis of Ag3VO4/diatomite composite material for efficient degradation of organic dyes under visible light

[Display omitted] •The Ag3VO4/diatomite materials of different proportions were perpared by one-step method.•As a natural raw porous material, diatomite has a good effect on dye molecules.•50%-Ag3VO4/diatomite material has the best photocatalytic effect on RhB and MB.•The Ag3VO4/diatomite material has a synergistic effect and improves the efficiency. In this work, the Ag3VO4/diatomite composites with different ratio were successfully synthesized through one-step method. Through relevant characterizations, the results indicated that a large number of Ag3VO4 nanoparticles attached to the surface and pores in the diatomite. The photocatalytic performances of the samples were analyzed using degradation of RhB in aqueous solution under visible light irradiation (λ ≥ 400 nm). The results showed that the Ag3VO4/diatomite composite exhibited the highest photocatalytic activity when the diatomite content reached 50%. After 40 min irradiation, almost 96% of RhB can be degraded. The photodynamic kinetic constant of the 50%-Ag3VO4/diatomite composite is 3.57 times higher than that of pure Ag3VO4 nanoparticles. In addition, the photocatalyst can be repetitively used with a high photocatalytic activity. The photocatalytic mechanism also has been discussed. It is believed that the Ag3VO4/diatomite composites have extensive potential applications in waste water treatment.