Abstract
Bi2SiO5/Bi4MoO9 photocatalysts with heterostructures were successfully prepared using a one-pot solvothermal route. The effect of the molybdenum source on composite formation is discussed. Under ultraviolet light irradiation, the Bi2SiO5/Bi4MoO9 heterojunction photocatalyst exhibited higher photocatalytic performance than Bi2SiO5 and Bi4MoO9 towards the degradation of ciprofloxacin (CIP). This dramatically enhanced photoactivity can be ascribed to the construction of a heterojunction interface between Bi2SiO5 and Bi4MoO9, which not only suppresses the recombination of photoexcited charge carriers but also enhances light absorption. In addition, from a practical point of view, the the effect of initial CIP concentration and coexisting ions on the photodegradation process using as-prepared Bi2SiO5/Bi4MoO9 heterojunction photocatalysts was explored. Trapping experiments demonstrate that photoexcited holesand superoxide radicals are the main active species in the photodegradation of CIP over Bi2SiO5/Bi4MoO9 heterojunctions. Meanwhile, the conduction band and valence band potentials of Bi2SiO5 and Bi4MoO9 were measured by density functional theory calculation, diffuse reflectance spectroscopy and Mott–Schottky curves. A possible photocatalytic mechanism for CIP degradation over the Bi2SiO5/Bi4MoO9 heterojunction is proposed.
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