Abstract Herein, we present an overt hydrothermal approach for the synthesis of rGO-Bi2WO6 heterostructures based catalyst, which were later probed with XRD, FTIR, PL, BET surface area, XPS, FE-SEM and HR-TEM for their structural, optical and morphological characteristics. The as prepared material was explored to degrade levofloxacin, an antibiotic, using visible light at room temperature. The rGO-Bi2WO6 photocatalyst under optimized parameters exhibited 74.3% degradation efficiency within 120 min. The impact of optimal parameters i.e. levofloxacin concentration, pH and photocatalyst loading was also considered. Notably, rGO-Bi2WO6 heterostructure manifested excellent photocatalytic performance in comparison to pure Bi2WO6 nanoplates for levofloxacin degradation under the same process conditions. This enhancement could be owed to reduction in recombination rates of photoexcited charge carriers in rGO-Bi2WO6 owing to the introduction of graphene, which served as an excellent charge transporter. The mechanistic study of degradation of levofloxacin proposed upon the radical trapping investigations revealed the significant contribution of electrons and holes in the photocatalytic process.

中文翻译：

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rGO-Bi2WO6异质结构的水热合成用于光催化降解左氧氟沙星

摘要 在此，我们提出了一种用于合成 rGO-Bi2WO6 异质结构催化剂的公开水热方法，随后用 XRD、FTIR、PL、BET 表面积、XPS、FE-SEM 和 HR-TEM 对其结构、光学和形态特征。研究制备的材料在室温下使用可见光降解左氧氟沙星（一种抗生素）。优化参数下的 rGO-Bi2WO6 光催化剂在 120 分钟内表现出 74.3% 的降解效率。还考虑了最佳参数（即左氧氟沙星浓度、pH 值和光催化剂负载量）的影响。值得注意的是，与纯 Bi2WO6 纳米片相比，rGO-Bi2WO6 异质结构在相同工艺条件下对左氧氟沙星的降解表现出优异的光催化性能。这种增强可能是由于石墨烯的引入导致 rGO-Bi2WO6 中光激发电荷载流子的复合率降低，石墨烯是一种出色的电荷传输器。在自由基捕获研究中提出的左氧氟沙星降解机理研究揭示了电子和空穴在光催化过程中的重要贡献。