Construction of hollow Bi₂MoO₆@g-C₃N₄ core–shell microspheres for effective photooxidation degradation

The composite microspheres of Bi₂MoO₆@g-C₃N₄ with the hollow structure were synthesized by the template method and hydrothermal method. The characterization and analysis of the experimental results showed that compared with the single component, when the content of g-C₃N₄ in the composite was 1%, it had excellent light absorption ability and the kinetic constant of photodegradation was 0.0209 min⁻¹ which was 3.87 and 6.53 times higher than that of g-C₃N₄ and Bi₂MoO₆, respectively, greatly improving the photocatalytic performance. The improved photocatalytic performance is attributed to the construction of the hollow sphere structure and its composite forming a heterojunction, which effectively promotes electron–hole separation and transfer. The composite photocatalyst exhibited good photochemical stability in cycling tests under simulated sunlight irradiation.