Velmurugan Rengasamy, Sreedhar Bojja, Swaminathan Meenakshisundaram
Department of Chemistry, Annamalai University, Annamalainagar 608 002, India.
Chem Cent J. 2011 Jul 30;5:46. doi: 10.1186/1752-153X-5-46.
The AgBr loaded TiO2 catalyst was prepared by a feasible approach with AgBr and tetraisopropyl orthotitanate and characterized by BET surface area measurement, diffuse reflectance spectra (DRS), scanning electron microscope (SEM), energy dispersive spectra (EDS), X-ray diffraction (XRD), transmission electron microscope (TEM) and atomic force microscope (AFM) analysis. The results of characterization reveal that AgBr loaded TiO2 has a nanostructure. Formation of the nanostructure in AgBr loaded TiO2 results in substantial shifting of the absorption edge of TiO2 to red and enhancement of visible light absorption. Electrochemical impedance spectroscopy measurements reveal that AgBr loaded TiO2 has a higher photoconductivity than prepared TiO2 due to higher separation efficiency of electron-hole pairs. Cyclic voltammetric studies reveal enhanced conductivity in AgBr loaded TiO2, which causes an increase in its photocatalytic activity. AgBr loaded TiO2 exhibited a higher photocatalytic activity than TiO2-P25 and prepared TiO2 in the photodegradation of Reactive Red 120 (RR 120).
通过一种可行的方法，以溴化银和原钛酸四异丙酯制备了负载溴化银的二氧化钛催化剂，并通过比表面积测量、漫反射光谱（DRS）、扫描电子显微镜（SEM）、能谱（EDS）、X射线衍射（XRD）、透射电子显微镜（TEM）和原子力显微镜（AFM）分析对其进行了表征。表征结果表明，负载溴化银的二氧化钛具有纳米结构。负载溴化银的二氧化钛中纳米结构的形成导致二氧化钛的吸收边大幅向红色移动，并增强了可见光吸收。电化学阻抗谱测量表明，由于电子-空穴对的分离效率更高，负载溴化银的二氧化钛比制备的二氧化钛具有更高的光电导率。循环伏安研究表明，负载溴化银的二氧化钛的导电性增强，这导致其光催化活性增加。在活性红120（RR 120）的光降解中，负载溴化银的二氧化钛比TiO2-P25和制备的二氧化钛表现出更高的光催化活性。
