Fabrication of novel organic/inorganic polyimide-BiPO4 heterojunction for enhanced photocatalytic degradation performance

The organic-inorganic heterojunction composites possessed excellent physical and chemistry properties has enormous potential in the field of wastewater purification. Herein, the novel PI-BiPO₄ heterojunction photocatalysts were synthesized via facile hydrothermal method. The different ratio PI-BiPO₄ composites exhibited remarkable photodegradation performance than that of the pure BiPO₄. The enhanced photocatalytic activity of 75PI-BiPO₄ composites was ascribed to the improvement of light absorption ability and larger specific surface area. What is more, the forming of heterojunction between PI and BiPO₄ was conduce to the separation and migration of the photogenerated electron-hole pairs. The h⁺ and O₂^- confirmed by EPR facility were predominant reactive species in the photocatalytic process. In addition, the feasible pathway of photocatalytic degradation TC were inferred on account of the UPLC-MS/MS results. This work provides a novel organic-inorganic heterojunction composites for supporting the field of the pollutant purification.

Fe3O4@Resorcinol-Formaldehyde Resin/Cu2O Composite Microstructures: Solution-Phase Construction, Magnetic Performance, and Applications in Antibacterial and Catalytic Fields

Multifunctional Fe₃O₄@resorcinol-formaldehyde resin/Cu₂O composite microstructures (denoted as Fe₃O₄@RF/Cu₂O microstructures) were successfully constructed via a simple wet chemical route that has not been reported so far in the literature. The as-obtained Fe₃O₄@RF/Cu₂O microstructures were characterized using field-emission scanning electron microscopy, (high-resolution) transmission electron microscopy, selected-area electron diffraction, X-ray diffraction, and X-ray energy dispersive spectroscopy. The investigations showed that the as-obtained microstructures presented not only excellent antibacterial activity to Staphylococcus aureus (Gram-positive bacteria) and Escherichia coli (Gram-negative bacteria) but also highly efficient catalytic ability for the reduction of 4-nitrophenol (4-NP) in a solution with excess NaBH₄. Owing to the presence of Fe₃O₄, the antibacterial reagent and the catalyst could be readily collected from the mixed systems under the assistance of an external magnetic field. It was found that the as-obtained microstructures displayed good cycling stability in antibacterial and catalytic applications. Fe₃O₄@RF/Cu₂O microstructures still retained more than 87% of the antibacterial efficiency after 5 cycles and 89% of the catalytic efficiency after 10 cycles.