In this work, we provide a facile method to synthesize Bi₂O₄/Bi₂WO₆ heterojunction by a two-step hydrothermal. Bi₂O₄ micro-rods are in-situ generated on the surface of Bi₂WO₆ microspheres. Compared to pure Bi₂WO₆, the photocatalytic activity for the Bi₂O₄/Bi₂WO₆ heterojunction was enhanced 5 folds in degradation of Rhodamine B. In the degradation of Methyl Orange, the enhanced factor could reach to 90 folds under visible light. The superior activity could be attributed to the rapid separation and transfer of photogenerated charge carries, which could be proved by photocurrent test and electrochemical impedance spectroscopy (EIS). Moreover, the active material trapping experiments proved that ·O₂⁻ and h⁺ are the main active species in the degradation process. The present work provides a new sight for the fabricating of visible light-driven photocatalyst with high efficiency.

在这项工作中，我们提供了一种通过两步水热法合成Bi ₂ O ₄ / Bi ₂ WO ₆异质结的简便方法。在Bi ₂ WO ₆微球的表面上原位产生Bi ₂ O ₄微棒。与纯Bi ₂ WO ₆相比，Bi ₂ O ₄ / Bi ₂ WO ₆的光催化活性罗丹明B的降解使异质结增强了5倍。在甲基橙的降解中，增强因子在可见光下可以达到90倍。优异的活性归因于光生电荷载流子的快速分离和转移，这可以通过光电流测试和电化学阻抗谱（EIS）证明。此外，活性物质捕集实验证明，·O2 ₂ ^-和H ⁺是在降解过程中的主要活性物质。本工作为高效制备可见光驱动的光催化剂提供了新的视野。