Ag-AgX(X=Cl, Br)@TiO₂ nanoparticle aggregated spheres (NPAS) with different mass ratio of R=TiO₂/Ag(X) from 35:1 to 5:1 were synthesized by a facile sol-gel technique with post photoreduction. The photocatalytic activities of both Ag-AgCl@TiO₂ and Ag-AgBr@TiO₂ under visible light are effectively improved by ~3 times relative to TiO₂ NPAS under the simulated sunlight for the decomposition of methyl orange (MO). Ag-AgBr@TiO₂ showed 30% improvement and less stable in photocatalytic activity than that of AgCl@TiO₂. The role of Ag and AgX nanoparticles on the surface of Ag-AgX(X=Cl, Br)@TiO₂ was discussed. Ag on these samples not only can efficiently harvest visible light especially for AgCl, but also efficiently separate excited electrons and holes via the fast electron transfer from AgX(X=Cl, Br) to metal Ag nanoparticles and then to TiO₂ aggregated spheres on the surface of heterostructure. On the basis of their efficient and stable photocatalytic activities under visible light irradiation, these photocatalysts could be widely used for degradation of organic pollutants in aqueous solution.

通过简便的溶胶-凝胶技术合成了R = TiO ₂ / Ag（X）的质量比为35：1至5：1的Ag-AgX（X = Cl，Br）@TiO ₂纳米颗粒聚集球（NPAS）与后期光还原。在模拟日光下，Ag-AgCl @ TiO ₂和Ag-AgBr @ TiO ₂的光催化活性相对于TiO ₂ NPAS有效地提高了约3倍，从而可降解甲基橙（MO）。与AgCl @ TiO ₂相比，Ag-AgBr @ TiO ₂显示出30％的改善并且光催化活性不稳定。讨论了Ag和AgX纳米粒子在Ag-AgX（X = Cl，Br）@TiO ₂表面上的作用。银上 这些样品不仅可以有效地收集可见光，特别是对于AgCl，还可以通过将电子从AgX（X = Cl，Br）快速转移到金属Ag纳米颗粒，然后转移到TiO ₂表面的TiO ₂聚集球上，有效地分离激发的电子和空穴。异质结构。在他们的e的基础FFI古老而可见光照射下稳定的光催化活性，这些光催化剂可广泛用于有机的降解在水溶液中的污染物。