Cu改性石墨相氮化碳(g-C3N4)光催化灭活铜绿微囊藻的效能与机理研究

通过热聚合法制备不同比例Cu掺杂g-C₃N₄复合光催化材料，利用XRD、SEM/EDX、FT-IR、UV-Vis DRS、PL、XPS等技术对复合材料的形貌结构和光学性能进行表征，研究了复合材料对藻细胞的光催化灭活效果.结果表明，Cu掺杂改性可有效促进g-C₃N₄材料表面光生电子-空穴的分离，增强其对可见光的利用率，进而提升其光催化效率；随着Cu掺杂比例的增大，Cu-C₃N₄对藻细胞的灭活效果则越好.进一步研究发现，H₂O₂和·O₂^-是Cu-C₃N₄光催化灭藻过程中起主要作用的活性物质，会损伤藻细胞的形态结构、抗氧化酶系统和光合系统，导致藻细胞大量死亡.

The efficiency and mechanism for photocatalytic inactivation of Microcystis aeruginosa by Cu-doped graphitic carbon nitride

In this study, different ratios of Cu-doped g-C₃N₄ were prepared by thermal polymerization. The morphologies and optical properties of the composites were characterized by XRD, SEM/EDX, FT-IR, UV-Vis DRS, PL and XPS techniques. The efficiencies of the composites on photocatalytic inactivation of Microcystis aeruginosa were investigated. The results showed that Cu doping could effectively promote the separation of photo-generated electron-holes on the surface of g-C₃N₄, enhance its utilization of visible light, and then significantly improve its photocatalytic efficiency. The inactivation evaluation of Cu-C₃N₄ on algae cells indicated that the algae-killing efficiency of Cu-C₃N₄ increased with the Cu doping ratio. Additionally, H₂O₂ and ·O₂^- were proved to be the active species in Cu-C₃N₄ for algae cells inactivation, which might damage the morphological structure, antioxidant enzyme system and photosynthetic system, and lead to the death of algal cells.