C/TiO2-SO42-的制备及其光解水性能

通过溶胶-凝胶制备过程中水含量控制，分别获得了硫酸根修饰的TiO₂（25）和无修饰的TiO₂（150）两种二氧化钛载体。在两种载体上，通过浸渍法引入不同浓度的碳点胶体，获得了系列不同C含量的C_x/TiO₂（25）和C_x/TiO₂（150）催化剂。利用TEM、XRD、FT-IR、UV-Vis、BET、XPS等表征分析了催化剂的表面形貌、晶格间距、晶型结构、光吸收、孔结构及元素组成。结果显示：相对于无硫酸根修饰的TiO₂（150）催化剂，硫酸根修饰的TiO₂（25）催化剂的光吸收发生显著红移，展示了更宽的可见光响应；对于TiO₂（25）样品，C的引入可提高其O_ads/O_latt比值。催化性能研究显示，C的引入可以提高其光催化活性。

Preparation of C/TiO2-SO42- and their water splitting performance

The SO₄^2- modified TiO₂(25) and the unmodified TiO₂(150) have been prepared by sol-gel method via controlling the amount of introduced deionized water. Two series of C modified C_x/TiO₂(25) and C_x/TiO₂(150) samples were obtained by impregnating the TiO₂(25) and TiO₂(150) in carbon dots solution with various concentrations. The lattice spacing, crystalline, light absorption, pore size, specific surface area and element composition of the prepared catalysts were characterized by TEM, XRD, FT-IR, UV-Vis, BET and XPS. The results indicated that compared with the unmodified TiO₂(150), the SO₄^2- modified TiO₂(25) exhibited a distinct red shift phenomenon and broader visible light response for the light absorption. Moreover, the O_ads/O_latt ratios can be improved distinctly for the TiO₂(25) when the carbon dots were introduced. The catalytic performance showed that the addition of C can enhance the corresponding photocatalytic activity.