Fabrication of easily recyclable photocatalyst with excellent photocatalytic activity for degradation of organic pollutants in wastewater is highly desirable for practical application. In this study, a novel ternary magnetic photocatalyst BiVO₄/Fe₃O₄/reduced graphene oxide (BiVO₄/Fe₃O₄/rGO) was synthesized via a facile hydrothermal strategy. The BiVO₄/Fe₃O₄ with 0.5 wt% of rGO (BiVO₄/Fe₃O₄/0.5% rGO) exhibited superior activity, degrading greater than 99% Rhodamine B (RhB) after 120 min solar light radiation. The surface morphology and chemical composition of BiVO₄/Fe₃O₄/rGO were studied by scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, UV visible diffuse reflectance spectroscopy, Fourier transform infrared spectroscopy, and Raman spectroscopy. The free radicals scavenging experiments demonstrated that hole (h⁺) and superoxide radical (O₂^•−) were the dominant species for RhB degradation over BiVO₄/Fe₃O₄/rGO under solar light. The reusability of this composite catalyst was also investigated after five successive runs under an external magnetic field. The BiVO₄/Fe₃O₄/rGO composite was easily separated, and the recycled catalyst retained high photocatalytic activity. This study demonstrates that catalyst BiVO₄/Fe₃O₄/rGO possessed high dye removal efficiency in water treatment with excellent recyclability from water after use. The current study provides a possibility for more practical and sustainable photocatalytic process.

制备具有优异光催化活性的易于回收的光催化剂用于降解废水中的有机污染物是实际应用中非常需要的。在这项研究中，通过简便的水热策略合成了一种新型三元磁性光催化剂 BiVO ₄ /Fe ₃ O ₄ /还原氧化石墨烯（BiVO ₄ /Fe ₃ O ₄ /rGO）。BiVO ₄ /Fe ₃ O ₄与 0.5 wt% 的 rGO (BiVO ₄ /Fe ₃ O ₄/0.5% rGO) 表现出优异的活性，在 120 分钟的太阳光辐射后降解超过 99% 的罗丹明 B (RhB)。通过扫描电子显微镜、X射线衍射、X射线光电子能谱、紫外可见漫反射光谱、傅里叶变换红外光谱和拉曼光谱研究了BiVO ₄ /Fe ₃ O ₄ /rGO的表面形貌和化学成分。自由基清除实验表明，空穴（h ⁺）和超氧自由基（O ₂ ^•-）是对BiVO ₄ /Fe ₃ O ₄降解RhB的主要物种/rGO 在太阳光下。在外部磁场下连续运行五次后，还研究了这种复合催化剂的可重复使用性。BiVO ₄ /Fe ₃ O ₄ /rGO复合材料易于分离，回收的催化剂保持了较高的光催化活性。该研究表明，催化剂BiVO ₄ /Fe ₃ O ₄ /rGO 在水处理中具有较高的染料去除效率，且使用后可从水中回收利用。目前的研究为更实用和可持续的光催化过程提供了可能。