Abstract In the study, cuprous oxide (Cu2O) combined with sillenite bismuth ferrite (Bi25FeO40) was successfully fabricated through hydrothermal strategy. Subsequently, physicochemical properties of Cu2O/Bi25FeO40 were studied by X-ray diffraction (XRD), transmission electron microscopy (TEM), N2 adsorption/desorption, X-ray photoelectron spectroscopy measurements (XPS), UV visible diffuse reflectance spectroscopy (DRS). The experimental results indicated that Cu2O/Bi25FeO40 exhibited a significantly enhanced photocatalytic activity, which 85.0% of sulfamethoxazole was decomposed in 120 min under irradiation. Afterwards, scavenger experiments have been carried out to determine the contributions of different species and h+ and H2O2 were manifested to be staple reactive species during the process of sulfamethoxazole (SMX) degradation. In addition, Cu2O/Bi25FeO40 nanocomposite showed good stabilities. And the degradation efficiency of SMX still reached 84.9% after five recycle experiments. Furthermore, some plausible degradation pathways of sulfamethoxazole were detected by a high-performance liquid chromatography-tandem mass spectrometry. Finally, the enhanced visible light photocatalytic mechanism was proposed reasonably. Eventually, this study provides a novel strategy to prepare catalyst which could be potentially applied in emerging pollutants elimination.

中文翻译：

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Cu2O/Bi25FeO40纳米复合材料的制备及其增强光催化机理和磺胺甲恶唑降解途径

摘要 本研究采用水热法成功制备了氧化亚铜(Cu2O)与亚硒酸铋铁氧体(Bi25FeO40)复合材料。随后，通过 X 射线衍射 (XRD)、透射电子显微镜 (TEM)、N2 吸附/解吸、X 射线光电子能谱测量 (XPS)、紫外可见漫反射光谱 (DRS) 研究了 Cu2O/Bi25FeO40 的理化性质。实验结果表明，Cu2O/Bi25FeO40表现出显着增强的光催化活性，在辐照下120 min内可分解85.0%的磺胺甲恶唑。之后，进行了清除剂实验以确定不同物种的贡献，并且 h+ 和 H2O2 被证明是磺胺甲恶唑 (SMX) 降解过程中的主要反应物种。此外，Cu2O/Bi25FeO40纳米复合材料表现出良好的稳定性。并且经过5次循环实验后SMX的降解效率仍达到84.9%。此外，通过高效液相色谱-串联质谱法检测了磺胺甲恶唑的一些可能的降解途径。最后，合理地提出了增强型可见光光催化机理。最终，该研究提供了一种制备催化剂的新策略，该策略可能应用于消除新兴污染物。合理提出了增强型可见光光催化机理。最终，该研究提供了一种制备催化剂的新策略，该策略可能应用于消除新兴污染物。合理提出了增强型可见光光催化机理。最终，该研究提供了一种制备催化剂的新策略，该策略可能应用于消除新兴污染物。