College of Chemistry and Chemical Engineering, Hubei Key Laboratory of Pollutant Analysis and Reuse Technology, Hubei Normal University, Huangshi, Hubei 435002, People's Republic of China.
Nanotechnology. 2020 Aug 21;31(34):345604. doi: 10.1088/1361-6528/ab912f. Epub 2020 May 7.
BiSiO/BiMoO 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 BiSiO/BiMoO heterojunction photocatalyst exhibited higher photocatalytic performance than BiSiO and BiMoO towards the degradation of ciprofloxacin (CIP). This dramatically enhanced photoactivity can be ascribed to the construction of a heterojunction interface between BiSiO and BiMoO, 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 BiSiO/BiMoO heterojunction photocatalysts was explored. Trapping experiments demonstrate that photoexcited holes and superoxide radicals are the main active species in the photodegradation of CIP over BiSiO/BiMoO heterojunctions. Meanwhile, the conduction band and valence band potentials of BiSiO and BiMoO were measured by density functional theory calculation, diffuse reflectance spectroscopy and Mott-Schottky curves. A possible photocatalytic mechanism for CIP degradation over the BiSiO/BiMoO heterojunction is proposed.
采用一锅溶剂热法成功制备了具有异质结构的 BiSiO/BiMoO 光催化剂。讨论了钼源对复合材料形成的影响。在紫外光照射下，BiSiO/BiMoO 异质结光催化剂对环丙沙星（CIP）的降解表现出比 BiSiO 和 BiMoO 更高的光催化性能。这种显著增强的光活性可归因于 BiSiO 和 BiMoO 之间构建了异质结界面，不仅抑制了光生载流子的复合，而且增强了光吸收。此外，从实际角度出发，探讨了初始 CIP 浓度和共存离子对所制备的 BiSiO/BiMoO 异质结光催化剂光降解过程的影响。捕获实验表明，在 BiSiO/BiMoO 异质结上光降解 CIP 过程中，光生空穴和超氧自由基是主要的活性物质。同时，通过密度泛函理论计算、漫反射光谱和 Mott-Schottky 曲线测量了 BiSiO 和 BiMoO 的导带和价带电位。提出了 BiSiO/BiMoO 异质结光催化降解 CIP 的可能机理。
