A novel approach of preparing TiO2 films at low temperature and its application in photocatalytic degradation of methyl orange.
A novel approach of preparing TiO2 films at low temperature and its application in photocatalytic degradation of methyl orange.
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DOI：
10.1016/j.jhazmat.2009.12.095
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发表时间：
2010-05
影响因子：
13.6
通讯作者：
Yanrong Zhang;J. Wan;Y. Ke
中科院分区：
文献类型：
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作者：
Yanrong Zhang;J. Wan;Y. Ke
本文介绍了一种在导电衬底上低温制备二氧化钛薄膜的新方法，即无需后续焙烧处理的电泳法沉积二氧化钛薄膜。通过对甲基橙(MO)的降解率来评价不经焙烧的TiO2薄膜的光催化活性。研究发现，MO的降解率随二氧化钛加入量的增加而增加，且在酸性和碱性条件下的降解率均高于神经条件下的降解率。此外，较低的pH值更有利于MO的降解。MO的光催化降解可描述为准一级反应。当MO初始浓度从1 mg/L增加到10 mg/L时，5 mg/L时降解速率最大，表观反应速率常数为0.0098min−1。
Here we introduce a novel approach of preparing TiO2films on conductive substrates at low temperature by electrophoretic deposition method without successive calcinate treatment. The photocatalytic activity of the non-calcinated TiO2film was evaluated by degradation rate of methyl orange (MO). We found that the degradation rate of MO increased with the amount of TiO2, and it was higher in both acidic and alkaline media than under neural condition. In addition, lower pH was more favorable for the degradation of MO. The photocatalytic degradation of MO could be described as pseudo-first order reactions. When the initial concentration of MO increased from 1mg/L to 10mg/L, the highest degradation rate was achieved at 5mg/L. The apparent reaction rate constant was calculated to be 0.0098min−1.