A NA/NH₂-MIL-125(Ti) homojunction was prepared by grafting 1-naphthylamine (–NA, a chromophore group) on the –NH₂ group in part of NH₂-MIL-125(Ti). In-depth investigation of the optical and structural variations was carried out. The results indicated that the lattice structure of NH₂-MIL-125(Ti) was well preserved after –NA modification. Whereas NA/NH₂-MIL-125(Ti) with 10% –NA ratio exhibited optimal photocurrent response and the lowest charge separation efficiency. In photocatalytic activity experiments, NA/NH₂-MIL-125(Ti) showed excellent activity with more than 99% Cr(VI) reduction and 99.999% bactericidal efficiency within 60-min irradiation. Furthermore, the photocatalysts showed good stability after 5 cyclic runs. Then, a mechanism about how the bacteria were killed was proposed, which was mainly contributed by the destruction of the cell membrane by photogenerated singlet oxygen (¹O₂). The results of this work will open a new route to the synthesis of MOFs for multiple photocatalytic applications.

NA/NH ₂ -MIL-125(Ti) 同质结通过在部分NH ₂ -MIL-125(Ti)的-NH ₂基团上接枝1-萘胺（-NA，发色团）来制备。对光学和结构变化进行了深入研究。结果表明，经过-NA修饰后，NH ₂ -MIL-125(Ti)的晶格结构得到了很好的保留。而 NA/NH ₂ -MIL-125(Ti) 与 10% -NA 比率表现出最佳的光电流响应和最低的电荷分离效率。在光催化活性实验中，NA/NH ₂-MIL-125(Ti) 表现出优异的活性，在 60 分钟的照射下，Cr(VI) 还原率超过 99%，杀菌效率为 99.999%。此外，光催化剂在 5 次循环运行后表现出良好的稳定性。^{然后，提出了一种关于细菌如何被杀死的机制，这主要是由于光生单线态氧（ 1} O ₂ ）对细胞膜的破坏造成的。这项工作的结果将为用于多种光催化应用的 MOFs 的合成开辟一条新途径。