Regardless of the fact that tungsten trioxide (WO₃) is recognized as one of the most promising photocatalysts for potential activity under visible light illumination, it still suffers from intrinsic drawbacks such as photocorrision and an unsuitable band gap structure for the reduction of molecular oxygen. To overcome these limitations we herein report for the first time in-situ synthesized WO₃ nanoparticles which were coupled with commercial TiO₂ (P25) via a simple impregnation method. The surface of the composites were additionally grafted with varying contents (0.005–0.3 wt%) of Fe(III) nanoclusters with their synergistic performance being investigated. The photocatalytic activities of the obtained materials were evaluated by monitoring the decomposition of the model compounds nitric oxide (NO) and acetaldehyde under UV and visible light illumination. A significant improvement of visible light sensitivity was attained in comparison with bare WO₃/TiO₂. Additionally the synthesized photocatalysts have been characterized by using x-ray powder diffraction(XRD), transmission electron microscopy (TEM), electron paramagnetic resonance (EPR) spectroscopy, UV–vis diffuse reflectance spectroscopy and N₂ adsorption (BET) for specific surface area determination. The EPR results confirmed a direct charge transfer from the VB of the composites to the surface grafted Fe(III) nanoclusters, which are promoting multi-electron reduction processes consequently resulting in the degradation of harmful gases.

尽管三氧化钨（WO ₃）被认为是在可见光照射下具有潜在活性的最有前途的光催化剂之一，但它仍然遭受诸如光腐蚀和不适合的带隙结构等固有缺陷，无法还原分子氧。为了克服这些限制，我们在此首次报告了与商业TiO ₂偶联的原位合成WO ₃纳米颗粒（P25）通过简单的浸渍方法。复合材料的表面还接枝了不同含量（0.005-0.3 wt％）的Fe（III）纳米团簇，并研究了它们的协同性能。通过监测模型化合物一氧化氮（NO）和乙醛在紫外线和可见光照射下的分解，评估了所得材料的光催化活性。与裸露的WO ₃ / TiO ₂相比，可见光灵敏度得到了显着改善。此外，合成的光催化剂还通过X射线粉末衍射（XRD），透射电子显微镜（TEM），电子顺磁共振（EPR）光谱，UV-vis漫反射光谱和N _2进行了表征。吸附（BET）进行比表面积测定。EPR结果证实了从复合材料的VB到表面接枝的Fe（III）纳米团簇的直接电荷转移，这促进了多电子还原过程，从而导致有害气体的降解。