Abstract
Abstract Anodic growth of TiO 2 nanotubes has recently attracted intensive interests. However, the insulating, closed barrier layer has restricted their feasibility for the applications such as flow-through photocatalytic reactions, biofiltration, and diffusion controlling. In the present work, we fabricated free-standing TiO 2 membranes with through-hole morphology by elevating the anodizing voltage at the end of anodization process. Characterization of the samples was carried out by means of scanning electron microscope, X-ray diffraction and thermogravimetry-differential scanning calorimetry. The experimental results show that the TiO 2 membranes start to transform from amorphous phase to anatase at 300 °C, and the phase transformation from anatase to rutile starts at 650 °C. In addition, photocatalytic degradation of rhodamine B by the TiO 2 membranes with closed bottoms and opened bottoms has also been systematically investigated. As compared to TiO 2 membranes with closed bottoms, TiO 2 membranes with opened bottoms exhibited superior photocatalytic activity due to its better access for rhodamine B molecules as well as the enhanced light harvesting and electron collection efficiencies.
Published Version
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