Electrodeposited Mesoporous ZnO Thin Films as Efficient Photocatalysts for the Degradation of Dye Pollutants
Electrodeposited Mesoporous ZnO Thin Films as Efficient Photocatalysts for the Degradation of Dye Pollutants
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DOI：
10.1021/jp071465f
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发表时间：
2007-05
影响因子：
3.7
通讯作者：
and T. Pauporté;J. Rathouský
中科院分区：
文献类型：
--
作者：
and T. Pauporté;J. Rathouský
以曙红Y为结构导向剂，采用电化学沉积法制备了氧化锌介孔薄膜。去除结构中的曙红后，得到了透明的多孔氧化锌薄膜。这些薄膜的孔隙率和表面积是通过进行氪的BET测量来确定的。优化了沉积时间和镀液中曙红浓度等电化学沉积参数，以获得内比表面积大、力学性能好的薄膜。曙红浓度为50−60μM时，氧化锌介孔薄膜质量最好，薄膜厚度为2~3μm。以杂多酸染料(亚甲蓝)和重氮染料(刚果红)的光降解为模型反应，评价了氧化锌薄膜的光催化活性。对于这两种染料，曙红浓度大于40μM的介孔薄膜的光降解速率最大。
Thin mesoporous films of ZnO were prepared by electrochemical deposition using eosin Y as a structure-directing agent. After removal of the eosin from the structure, transparent porous ZnO films were obtained. The porosity and surface area of these films were determined by performing krypton BET measurements. Electrochemical deposition parameters, such as the deposition time and the eosin concentration in the plating bath, were optimized to prepare films with large internal surface areas and good mechanical properties. Eosin concentrations of 50−60 μM were found to give the best-quality mesoporous zinc oxide films with film thicknesses ranging from 2 to 3 μm. The photodegradations of a heteropolyaromatic dye (methylene blue) and a diazo dye (congo red) served as model reactions to assess the photocatalytic activity of the zinc oxide films. For both dyes, the photodegradation rate reached its maximum for mesoporous films that were prepared with eosin concentrations above 40 μM. As the photodegradation was ...