In the present work, we report the effect of the addition of platinum (Pt loading 1 wt%) on photocatalysts based on TiO₂ and its incorporation in a SiO₂ matrix using the sol gel method. The photocatalyst/silica matrix ratio was w(TiO₂)/w(SiO₂) of 15/85. The characterization of the samples was carried out with X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), specific surface area by N₂ physisorption (BET) and UV–Vis diffuse reflectance spectroscopy (UV–Vis DRS). The photoactivity of the samples was evaluated in the photodegradation of 2,4-dichlorophenoxyacetic acid (2,4-D). The production of hydroxyl radicals (^•OH) on the surface of the samples irradiated with UV light was detected by the fluorescence technique using terephthalic acid as a test molecule. The resulting supported catalyst showed enhanced photocatalytic activity towards 2,4-D degradation, almost 97% of the 2, 4-D was degraded with Pt/TiM–Si sample in 180 min compared to pure commercial TiO₂ P25 under UV radiation. The increase in photoactivity can be attributed to the extended band gap energy, large surface area, and a better charge separation and more efficient transfer of the photogenerated charges (e⁻–h⁺) due to the presence of Pt ions on the surface of the photocatalyst. Finally, stability and reusability test of the samples was estimated using recycling experiments, indicating its remarkable efficiency in contaminated water treatment.

在本工作中，我们报告了添加铂（Pt含量为1 wt％）对基于TiO _2的光催化剂的影响，以及使用溶胶凝胶法将其掺入SiO ₂基质中的影响。光催化剂/二氧化硅基质的比率为w（TiO ₂）/ w（SiO ₂）为15/85。通过X射线衍射（XRD），透射电子显微镜（TEM），扫描电子显微镜（SEM），能量色散X射线光谱（EDS），N ₂物理吸附比表面积（BET ）对样品进行表征）和UV-Vis漫反射光谱（UV-Vis DRS）。在2，4-二氯苯氧基乙酸（2，4-D）的光降解中评估样品的光活性。羟基自由基的产生（^•用UV光照射的样品的表面上的OH）通过使用对苯二甲酸作为测试分子的荧光技术检测。由此产生的负载型催化剂对2,4-D降解表现出增强的光催化活性，与纯商业TiO ₂ P25在紫外辐射下相比，Pt / TiM-Si样品在180分钟内降解了几乎97％的2,4-D 。光活性的增加可以归因于带隙能的扩展，大表面积以及更好的电荷分离和光生电荷的更有效转移（e ^-– h ⁺）是由于光催化剂表面上存在Pt离子。最后，使用回收利用实验评估了样品的稳定性和可重复使用性，表明其在污水处理中的显着效率。