The purpose of this study was to apply a peroxo sol–gel method to prepare silver and silica co-doped TiO₂ to enhance the stability of sol, TiO₂ particle size distribution, and improve photocatalytic activity under UV light or visible light irradiation. TiO₂ sol was prepared by peroxo sol–gel method using TiCl₄ as precursor and H₂O₂ as peptizing agent in order to induce the formation of TiO₂ nanoparticles that converted from Ti(OH)₄ at 95 °C. Silver and SiO₂ were then added in the TiO₂ sol to improve the photocatalytic activity and the transmittance of the sol. The Ag/TiO₂–SiO₂ nanoparticles were characterized by X-ray diffraction, transmission electron microscopy, high-resolution transmission electron microscopy, scanning electron microscope, X-ray photoelectron spectroscopy, dynamic light scattering, and UV–Vis spectroscopy. The sols remained neutral, stable, and did not precipitate after storage for over a year. TiO₂ was anatase as confirmed by XRD. Ag/TiO₂–SiO₂ films were active for destruction of methylene blue under UV light and visible light irradiation. The optimum Ag/SiO₂/TiO₂ molar ratio was 0.02/5/1. It showed the highest photocatalytic activities under both of UV light and visible light irradiation among all catalysts. The antibacteria test showed that after irradiation by UVA light for 3 h, the Ag/TiO₂–SiO₂ had a high antibacteria ability, and the antibacteria rate reached over 99.9%.

这项研究的目的是应用过氧溶胶-凝胶法制备银和二氧化硅共掺杂的TiO _2，以提高溶胶的稳定性，TiO _2的粒径分布，并改善在紫外光或可见光照射下的光催化活性。TiO ₂溶胶是采用过氧溶胶-凝胶法，以TiCl ₄为前驱体和H ₂ O ₂为胶溶剂制备的，目的是诱导在95°C下由Ti（OH）₄转化的TiO ₂纳米颗粒的形成。然后将银和SiO ₂添加到TiO ₂溶胶中以改善光催化活性和溶胶的透射率。银/钛通过X射线衍射，透射电子显微镜，高分辨率透射电子显微镜，扫描电子显微镜，X射线光电子能谱，动态光散射和UV-Vis光谱对_2- SiO ₂纳米颗粒进行了表征。储存一年以上后，溶胶保持中性，稳定，并且不会沉淀。通过XRD确认TiO ₂是锐钛矿。Ag / TiO ₂ -SiO ₂薄膜在紫外线和可见光照射下具有破坏亚甲基蓝的活性。最佳的Ag / SiO ₂ / TiO ₂摩尔比为0.02 / 5/1。在所有催化剂中，它在紫外线和可见光照射下均表现出最高的光催化活性。抗菌试验表明，经UVA光照射3 h后，Ag / TiO ₂ -SiO ₂具有较高的抗菌能力，抗菌率达到99.9％以上。