Dispersed TiO₂ hollow spheres were successfully prepared which was obtained via Ostwald ripening under solvothermal conditions without any templates or surfactants. Then, the AgI/TiO₂ was synthesized by the deposition-precipitation process. Finally, Ag/AgI/TiO₂ was obtained by a photocatalytic reduction way. Their characteristics were analyzed by XRD, SEM, HRTEM, N₂ adsorption-desorption measurements and UV-vis absorption spectra. To demonstrate the potential applications of such composites, their antibacterial activity against Escherichia coli (E. coli) was studied by microcalorimetry for the first time, and their photocatalytic performance for degradation of different organic dyes under simulated UV and visible light was discussed. The results indicated that Ag/AgI/TiO₂ hollow spheres revealed elevated antibacterial and photocatalytic activity because of their unique morphology, hollow structure and high surface area. The mechanism of the excellent antibacterial and photocatalytic activity of Ag/AgI/TiO₂ hollow spheres are discussed which are attributed to the synergetic effect of Ag, AgI and TiO₂. It suggested that the new Ag/AgI/TiO₂ photocatalyst has broad application prospects in solar cell, sensor, antibacterial, catalysis and nanotechnology.

成功地制备了分散的TiO ₂中空球，该球是通过在溶剂热条件下通过奥斯特瓦尔德熟化获得的，没有任何模板或表面活性剂。然后，通过沉积-沉淀工艺合成AgI / TiO ₂。最后，通过光催化还原的方法得到了Ag / AgI / TiO ₂。通过XRD，SEM，HRTEM，N ₂吸附-脱附测量和UV-vis吸收光谱分析了它们的特性。为了证明这种复合材料的潜在应用，它们对大肠杆菌的抗菌活性（E. coli）首次通过微量量热法进行了研究，并讨论了它们在模拟的紫外线和可见光下对不同有机染料降解的光催化性能。结果表明，Ag / AgI / TiO ₂空心球由于其独特的形貌，空心结构和高表面积而具有较高的抗菌和光催化活性。讨论了Ag / AgI / TiO ₂空心球优异的抗菌和光催化活性的机理，这归因于Ag，AgI和TiO ₂的协同作用。这表明新型Ag / AgI / TiO ₂光催化剂在太阳能电池，传感器，抗菌，催化和纳米技术领域具有广阔的应用前景。