Photocatalytic activity of TiO2 thin films deposited by cathodic arc
Photocatalytic activity of TiO2 thin films deposited by cathodic arc
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DOI：
10.1016/j.apcatb.2010.11.009
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发表时间：
2011-01
影响因子：
22.1
通讯作者：
A. Kleiman;A. Márquez;M. L. Vera;J. Meichtry;M. Litter
中科院分区：
文献类型：
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作者：
A. Kleiman;A. Márquez;M. L. Vera;J. Meichtry;M. Litter
本文报道了阴极电弧法在玻璃基片上制备的TiO_2薄膜（CA薄膜）的光催化活性和动力学行为，并与浸涂法制备的TiO_2 Degussa P-25薄膜（DC薄膜）进行了比较。的质量密度的膜，由X射线反射仪测定的DC膜相比，CA膜低20%，表明更高的孔隙率的DC样品。从在EDTA存在下还原Cr（VI）的效率评价活性。虽然CA膜的响应结果低于相同TiO 2含量的P-25膜（例如，对于具有0.03mgcm− 2 TiO 2的样品，在180分钟照射后，Cr（VI）减少90%对50%），这一事实与较低的孔隙率有关，但新材料的粘附性能要好得多。CA膜的光活性随着涂层厚度的增加而提高; 180分钟后，具有0.03mgcm− 2的TiO 2的样品呈现出50%的Cr（VI）还原，而具有0.28mgcm−2的样品呈现出80%的Cr（VI）还原。这些光催化剂制备简单，价格低廉，很有希望作为固定化材料用于光反应器中处理气态和水相体系中的污染物。
In this work, the photocatalytic activity and the kinetic behavior of anatase TiO2films deposited by cathodic arc (CA films) on glass substrates are reported and compared with those of TiO2Degussa P-25 films obtained by dip-coating immersion (DC films). The mass density of films, determined by X-ray reflectometry was 20% lower for DC films compared with CA films, indicating a higher porosity of DC samples. The activity was evaluated from the efficiency to reduce Cr(VI) in the presence of EDTA. Although the response of CA films resulted lower compared with that of P-25 films of the same TiO2content (e.g. 90% vs. 50% Cr(VI) reduction after 180min irradiation for samples with 0.03mgcm−2of TiO2), a fact associated to the lower porosity, adhesion properties of the new materials were much better. CA film photoactivity improved by increasing the coating thickness; after 180min, a sample with 0.03mgcm−2of TiO2presented 50% of Cr(VI) reduction vs. 80% for a sample with 0.28mgcm−2. These photocatalysts, whose preparation is simple and affordable, are very promising to be used as immobilized materials in photoreactors for the treatment of pollutants in gaseous and aqueous systems.