A New Visible-Light Photocatalyst: CdS Quantum Dots Embedded Mesoporous TiO2
A New Visible-Light Photocatalyst: CdS Quantum Dots Embedded Mesoporous TiO2
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DOI：
10.1021/es9011993
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发表时间：
2009-09-15
影响因子：
11.4
通讯作者：
Yu, Jimmy C.
中科院分区：
文献类型：
--
作者：
Li, Gui-Sheng;Zhang, Die-Qing;Yu, Jimmy C.
通过将氧化镉作为晶种预先植入有序介孔二氧化钛框架中，然后通过离子交换将CdO转化为硫化镉量子点（QDs），制备了硫化镉量子点敏化的介孔二氧化钛光催化剂。TiO₂框架中硫化镉量子点的存在通过加速光生电子从无机敏化剂向TiO₂的转移，将其光响应扩展到可见光区域。这种新型光催化剂在可见光照射下，对空气中一氧化氮气体的氧化以及水溶液中有机化合物的降解均表现出优异的光催化效率。采用X射线衍射（XRD）、N₂吸附 - 脱附、透射电子显微镜（TEM）、X射线光电子能谱（XPS）、紫外 - 可见光谱（UV/vis）和光致发光光谱（PL）对光催化剂进行了表征。讨论了样品的物理化学性质与光催化性能之间的关系。
Cadmium sulfide quantum dots (QDs) sensitized mesoporous TiO2 photocatalysts were prepared by preplanting cadmium oxide as crystal seeds into the framework of ordered mesoporous titanium dioxide and then converting CdO to CdS QDs through ion-exchange. The presence of CdS QDs in the TiO2 framework extended its photoresponse to the visible-light region by accelerating the photogenerated electron transfer from the inorganic sensitizer to TiO2. The new photocatalyst showed excellent photocatalytic efficiency for both oxidation of NO gas in air and degradation of organic compounds in aqueous solution under visible light irradiation. The photocatalysts were characterized by XRD, N-2 adsorption-desorption,TEM, XPS, UV/vis, and PL spectroscopy. The relationship between the physicochemical properties and the photocatalytic performance of the sample is discussed.