A STRUCTURAL INVESTIGATION OF TITANIUM-DIOXIDE PHOTOCATALYSTS
A STRUCTURAL INVESTIGATION OF TITANIUM-DIOXIDE PHOTOCATALYSTS
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DOI：
10.1016/0022-4596(91)90255-g
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发表时间：
1991-05-01
影响因子：
3.3
通讯作者：
TILLEY, RJD
中科院分区：
文献类型：
--
作者：
BICKLEY, RI;GONZALEZCARRENO, T;TILLEY, RJD
二氧化钛光催化剂（Degussa P25）的结构和形态的研究揭示了由非晶态组成的多相材料，以及近似比例为80 - 20的结晶相金红石和金红石。透射电子显微镜提供的证据表明，一些单独的颗粒是无定形状态与金红石相或与金红石相的混合物，并且一些颗粒，主要是无定形的，被一层薄薄的金红石覆盖，这表明它的存在由莫尔条纹的外观。据报道，这种形式的二氧化钛的光催化活性大于任何一种纯结晶相的活性，并且已经根据空间电荷电势的大小的增强给出了对这种观察的解释，所述空间电荷电势是通过存在的不同相之间的接触和来自非晶相的局部电子态的存在而产生的。
A study of the structure and the morphology of a titanium dioxide photocatalyst (Degussa P25) reveals multiphasic material consisting of an amorphous state, together with the crystalline phases anatase and rutile in the approximate proportions 80 20. Transmission electron microscopy provides evidence that some individual particles are a mixture of the amorphous state with either the anatase phase or with the rutile phase, and that some particles, which are mostly anatase, are covered by a thin overlayer of rutile which manifests its presence by the appearance of Moiré fringes. The photocatalytic activity of this form of titanium dioxide is reported as being greater than the activities of either of the pure crystalline phases, and an interpretation of this observation has been given in terms of the enhancement in the magnitude of the space-charge potential, which is created by contact between the different phases present and by the presence of localized electronic states from the amorphous phase.