Abstract In this contribution, mesoporous BiFeO3/graphene nanocomposites at varying BiFeO3 contents (0–20%) have been fabricated, and their photocatalytic performances were assessed for ciprofloxacin (CIP) photooxidation under visible light illumination. Mesoporous BiFeO3 nanoparticles were uniformly incorporated in graphene nanosheets with spherical-like morphology (30 nm–50 nm). The mesoporous BiFeO3 nanoparticles exhibited high pore volumes and large surface areas of 0.16 cm3 g–1 and 150 m2 g–1, respectively; they were boosted to 0.20 cm3 g–1 and 166 m2 g–1 for BiFeO3/graphene. The observed magnetization value of mesoporous BiFeO3 nanoparticles about 1.56 emu g−1 was ~five times higher than that previously published. The photocatalytic efficiencies of 5, 10, 15 and 20% BiFeO3/graphene nanocomposites were measured to be 70.4%, 88.2%, 96.2% and 98.8%, respectively, within 120 min illumination whereas the pure BiFeO3 nanoparticles were 50%. The apparent rate constant of 20% BiFeO3/graphene nanocomposite is greater ~4 times than that pure mesoporous BiFeO3 nanoparticles. The photodegradation rate of CIP over mesoporous BiFeO3/graphene was two times greater than that for pure mesoporous BiFeO3 nanoparticles, which is explained by the joint effects of covalent bonding and regulated band gap between mesoporous BiFeO3 and graphene. The magnetic separation of BiFeO3/graphene photocatalyst exhibits a very appropriate avenue to recover BiFeO3/graphene photocatalyst by employing a convenient magnetic field. The synthesized BiFeO3/graphene photocatalyst has excellent potential for practical applications with well recyclable and stability performance. The enhancement of BiFeO3/graphene was confirmed by measuring the photoluminescence, photocurrent and the magnetic properties.

中文翻译：

---

在可见光下具有高光活性的介孔 BiFeO3/石墨烯纳米复合材料的简便合成

摘要 在这项贡献中，制备了不同 BiFeO3 含量 (0-20%) 的介孔 BiFeO3/石墨烯纳米复合材料，并评估了它们在可见光照射下对环丙沙星 (CIP) 光氧化的光催化性能。介孔 BiFeO3 纳米颗粒均匀地掺入具有球形形态（30 nm-50 nm）的石墨烯纳米片中。介孔 BiFeO3 纳米颗粒具有高孔隙体积和大表面积，分别为 0.16 cm3 g-1 和 150 m2 g-1；对于 BiFeO3/石墨烯，它们分别提高到 0.20 cm3 g-1 和 166 m2 g-1。观察到的介孔 BiFeO3 纳米粒子的磁化值约为 1.56 emu g-1，比​​之前公布的值高约 5 倍。5%、10%、15% 和 20% BiFeO3/石墨烯纳米复合材料的光催化效率测量为 70.4%、88.2%、96。在 120 分钟光照内分别为 2% 和 98.8%，而纯 BiFeO3 纳米粒子为 50%。20% BiFeO3/石墨烯纳米复合材料的表观速率常数是纯介孔 BiFeO3 纳米颗粒的约 4 倍。CIP 在介孔 BiFeO3/石墨烯上的光降解率是纯介孔 BiFeO3 纳米粒子的两倍，这是由介孔 BiFeO3 和石墨烯之间的共价键合和调节带隙的共同作用来解释的。BiFeO3/石墨烯光催化剂的磁分离展示了一种非常合适的途径，通过使用方便的磁场来回收BiFeO3/石墨烯光催化剂。合成的 BiFeO3/石墨烯光催化剂具有良好的可回收性和稳定性能，具有良好的实际应用潜力。