At present, there are very few reports on the combination of phosphorescence and fluorescence in the field of pollution prevention. A composite antibacterial agent was designed to store energy by using the phosphorescence effect of rare earth oxides, emit light at night, and stimulate 7-amino-4-methylcoumarin to produce fluorescence and prevent algae from adhering. When complexed with PVA, it exhibited excellent characteristics as an all-weather autocatalytic phosphorescence–fluorescence antifouling hydrogel. The rare earth phosphorescent powder was prepared in a high-temperature tube furnace, coated with SiO₂ on the surface for waterproofing, and then grafted with 7-amino-4-methylcoumarin to obtain a composite antibacterial agent with a phosphorescence–fluorescence effect. The composite antibacterial agent was added with PVA to obtain a hydrogel, which exhibited bactericidal rates of more than 99.98% against both Gram-positive and Gram-negative bacteria after 48 h. The results of fluorescence staining showed that the coverage rate of dead bacteria reached 41.6% after 24 h. The tensile strength of the antifouling hydrogel is up to 1.49 MPa, which is strong enough for real marine environments. Moreover, the algae coverage area of the composite hydrogel under natural light was only 2.7%, representing a 10-fold reduction compared with the control. The antifouling hydrogel has good antipollution and algae suppression performance, which is due to the fact that the rare earth phosphorescent powder when exposed to sunlight can provide a light source to stimulate 7-amino-4-methylcoumarin fluorescence at night and thereby prevent algae adhesion. After testing in the marine field and the real sea test when wrapped in a fishing net, the excellent antifouling performance was demonstrated. The functional hydrogel has great application potential in the protection of seawater-exposed structures, such as bridges and bay ports.

中文翻译：

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基于稀土磷光驱动的 7-氨基-4-甲基香豆素荧光的先进海洋防污水凝胶


目前，磷光与荧光结合应用于污染防治领域的报道还很少。设计了一种复合抗菌剂，利用稀土氧化物的磷光效应储存能量，在夜间发光，并刺激7-氨基-4-甲基香豆素产生荧光，防止藻类粘附。当与PVA复合时，它表现出作为全天候自催化磷光-荧光防污水凝胶的优异特性。在高温管式炉中制备稀土磷光粉体，在表面涂覆SiO ₂ 进行防水，然后接枝7-氨基-4-甲基香豆素，得到复合抗菌剂。磷光-荧光效应。该复合抗菌剂添加PVA得到水凝胶，48 h后对革兰氏阳性菌和革兰氏阴性菌均表现出99.98%以上的杀菌率。荧光染色结果显示，24 h后死菌覆盖率达到41.6%。防污水凝胶的拉伸强度高达1.49 MPa，足以满足真实海洋环境的需要。此外，复合水凝胶在自然光下的藻类覆盖面积仅为2.7%，比对照减少了10倍。该防污水凝胶具有良好的抗污染和抑藻性能，这是由于稀土磷光粉在阳光照射下可以提供光源，在夜间激发7-氨基-4-甲基香豆素荧光，从而防止藻类粘附。 经过海洋现场测试和渔网包裹实海试验，表现出优异的防污性能。该功能性水凝胶在桥梁、海湾港口等暴露于海水的结构的保护方面具有巨大的应用潜力。