Ring-shaped Bi2WO6@CeO2 hybrid nanoparticle aggregates are fabricated through an environmental route and subsequent facile calcinations. The synthetic parameters are regulated to control the shape of the as-prepared samples. The concentration of the cyanide ion decreased sharply from the initial 4.72 mM to 0.95 mM with the exposure time of 60 min. The intrinsic ring-shaped microstructure results in multiple reflections of light within the chamber, allowing more efficient use of the light source compared with a solid structure. The p–n junction effect can lead to enhanced charge separation and interfacial charge transfer efficiency due to the existence of an internal electric field. Therefore, it exhibits a remarkable photocatalytic detoxification of cyanide and degradation of dye under visible light.
