P25/Bi2WO6 nanocomposite photocatalysts were synthesized by solvothermal method, and their photocatalytic activities were evaluated for the degradation of ethylene under visible light irradiation. The results show that P25/Bi2WO6 nanocomposites have higher photocatalytic activity than P25 and pure Bi2WO6. When the loading amount of P25 is 35%, the photocatalytic degradation of ethylene under visible light is the highest, which is 4.5 and 2.2 times higher than that of P25 and Bi2WO6, respectively. The improvement of the photocatalytic activity of the nanocomposite is mainly due to the formation of the staggered heterojunctions in the contact interface of P25 and Bi2WO6. This can refine the grain and produce lattice defects in the interface of the composite, which could provide more active sites. Therefore, the separation efficiency of the photogenerated electron-hole pair is improved, and the spectral response range is extended to the visible light region, thereby the absorption and utilization of light energy is improved. (C) 2018 Elsevier B.V. All rights reserved.