In this work, a novel Ag/AgCl@g-C₃N₄@UIO-66(NH₂) heterojunction was constructed for photocatalytic inactivation of Microcystis aeruginosa (M. aeruginosa) under visible light. The photocatalyst was synthesized by a facile method and characterized by XRD, SEM, TEM, BET, XPS, FT−IR, UV–vis DRS, PL and EIS. The nanocomposite can not only provide lots of active sites, but also improve capacities to utilize visible-light energy and effectively transfer charge carriers, thus enhancing removal efficiencies of cyanobacteria (99.9% chlorophyll a was degraded within 180 min). Various factors in photodegradation of chlorophyll a were studied. Besides, changes on cellular morphologies, membrane permeability, physiological activities of M. aeruginosa during photocatalysis were investigated. Moreover, the cycle test indicated that Ag/AgCl@g-C₃N₄@UIO-66(NH₂) exhibits excellent reusability and photocatalytic stability. Finally, a possible mechanism of M. aeruginosa inactivation was proposed. In a word, Ag/AgCl@g-C₃N₄@UIO-66(NH₂) can efficiently inactivate cyanobacteria under visible light, thus providing useful references for further removal of harmful algae in real water bodies.

在这项工作中，构造了一种新型的Ag / AgCl @ gC ₃ N ₄ @ UIO-66（NH ₂）异质结，用于在可见光下对铜绿微囊藻（M. aeruginosa）进行光催化灭活。通过简单的方法合成光催化剂，并通过XRD，SEM，TEM，BET，XPS，FT-IR，UV-vis DRS，PL和EIS对其进行表征。纳米复合材料不仅可以提供大量的活性位点，还可以提高利用可见光能量和有效转移电荷载流子的能力，从而提高蓝藻的去除效率（99.9％的叶绿素a在180分钟内被降解）。叶绿素a光降解的各种因素被研究了。此外，研究了铜绿假单胞菌在光催化过程中细胞形态，膜通透性和生理活性的变化。此外，循环测试表明，Ag / AgCl @ gC ₃ N ₄ @ UIO-66（NH ₂）表现出极好的可重复使用性和光催化稳定性。最后，提出了铜绿假单胞菌失活的可能机制。总之，Ag / AgCl @ gC ₃ N ₄ @ UIO-66（NH ₂）可以在可见光下有效地灭活蓝细菌，从而为进一步去除实际水体中的有害藻类提供了有用的参考。