Macro–meso-porous TiO2, ZnO and ZnO–TiO2-composite thick films. Properties and application to photocatalysis
Macro–meso-porous TiO2, ZnO and ZnO–TiO2-composite thick films. Properties and application to photocatalysis
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DOI：
10.1039/c1cy00302j
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发表时间：
2012-02
影响因子：
5
通讯作者：
J. Mani;H. Sakeek;S. Habouti;M. Dietze;M. Es‐Souni
中科院分区：
文献类型：
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作者：
J. Mani;H. Sakeek;S. Habouti;M. Dietze;M. Es‐Souni
我们报道了一种新的通用方法，用于制备均匀，无裂纹和大介孔的TiO2， ZnO和ZnO - TiO2复合材料厚膜，使用单步涂层工艺和相当低的退火温度（最高400°C）。该方法依赖于氧化物纳米粉末填料在优化的前驱体溶液中。该薄膜与基材具有良好的附着力，具有均匀分布的开孔性和亲水性。以甲基橙为模型染料，对膜的光催化活性进行了表征。结果表明，TiO2薄膜比ZnO和ZnO - TiO2复合薄膜具有更好的光催化活性。与颗粒光催化剂相比，这些复合膜的优点在于它们的坚固性和易于应用，因为不需要过滤。此外，可以将它们应用于合适的大面积膜上。
We report on a new and versatile method for preparing homogenous, crack-free and macro–meso-porous thick films of TiO2, ZnO and ZnO–TiO2 composites using a single step coating procedure and fairly low annealing temperatures of a maximum of 400 °C. The method relies on an oxide nanopowder filler in an optimized precursor solution. The films are well adherent to the substrate, show homogeneously distributed open porosity, and are hydrophilic. The photocatalytic activity of these films was characterized using methyl orange as a model dye. We show that the TiO2 films have better photocatalytic activity than ZnO and ZnO–TiO2 composite films. The advantages of these composite films over particulate photocatalysts lie in their robustness and ease of application as no filtration is needed. Furthermore it is possible to apply them on suitable large area membranes.