Photocatalytic Activity of Anodized Titanium Plates Prepared in a Bath Containing SnO<SUB>2</SUB> and TiO<SUB>2</SUB> Particles through 2-Step Anodization
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概要
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Thick anodized titanium plates with high photocatalytic activity were prepared by 2-step anodization method : first anodization in the bath (H<SUB>3</SUB>PO<SUB>4</SUB>-H<SUB>2</SUB>SO<SUB>4</SUB>-H<SUB>2</SUB>O<SUB>2</SUB>) containing SnO<SUB>2</SUB> and/or TiO<SUB>2</SUB> particles; reanodization in the mixture of NH<SUB>4</SUB>HF<SUB>2</SUB> and H<SUB>2</SUB>O<SUB>2</SUB>. The apparent rate constant (<I>k</I>), which was evaluated by the photooxidation decomposition of CH<SUB>3</SUB>CHO gas, was drastically improved by the addition of SnO<SUB>2</SUB> and/or TiO<SUB>2</SUB> particles. The high <I>k</I> value was mainly induced by the three things : (1) TiO<SUB>2</SUB> particles loaded on the film surface; (2) crystal growth of anatase because of a significant change in electrolytic behaviour; (3) acceleration of charge career separation owing to the transfer of a part of photogenerated electrons from TiO<SUB>2</SUB> to SnO<SUB>2</SUB> particles in the films.
- Japan Society of Colour Materialの論文