Our current efforts reveal the preparation of SiO₂@TiO₂ nanocomposites having different thicknesses of silica shell and the relationship to photocatalytic activity (PCA) for the photo-oxidation of naphthalene and anthracene. The presence of SiO₂ coating over TiO₂ surface was demonstrated by FT-IR analysis, with peaks corresponding to SiOSi (1081 cm⁻¹) and SiOTi (950 cm⁻¹) bonds observed. High-resolution transmission electron microscopy analysis confirmed the presence of SiO₂ in the as-prepared nanocomposites and the amount of Si, Ti, and O was determined by energy dispersive X-ray spectroscopy analysis. Increasing the SiO₂ shell thickness increases the surface area of the nanocomposites (69–235 m²/g), which enhances naphthalene/anthracene adsorption. However, the observed PCA trend presents an inverse correlation to the adsorption studies, where the as-prepared samples possessing the highest surface areas exhibited the least PCA, while catalysts having lower surface areas (among silica coated samples) displayed the highest PCA in the degradation of naphthalene and anthracene to CO₂. Despite complete degradation of naphthalene and anthracene, incomplete mineralization occurred, ascribed to the formation of various intermediates, identified by GC–MS analysis.

我们当前的努力揭示了具有不同二氧化硅壳厚度的SiO ₂ @TiO ₂纳米复合材料的制备以及与萘和蒽的光氧化作用的光催化活性（PCA）的关系。通过FT-IR分析证实了在TiO ₂表面上存在SiO ₂涂层，并且观察到对应于Si O Si（1081 cm ^-1）和Si O Ti（950 cm ^-1）键的峰。高分辨率透射电子显微镜分析证实了SiO ₂的存在制备的纳米复合材料中的元素含量，通过能量色散X射线光谱分析确定了Si，Ti和O的含量。SiO ₂壳厚度的增加会增加纳米复合材料的表面积（69–235 m ² / g），从而增强萘/蒽的吸附。但是，观察到的PCA趋势与吸附研究呈反相关关系，在吸附研究中，具有最高表面积的制备样品显示出最低的PCA，而具有较低表面积的催化剂（在涂有二氧化硅的样品中）在降解中显示出最高的PCA。和蒽对CO _2的合成。尽管萘和蒽已完全降解，但仍发生了不完全矿化，这归因于各种中间体的形成，通过GC-MS分析鉴定。