Figure 6.

UV-mediated decomposition of methylene blue in plastic tubes. (A) Photographs of the original methylene blue solution in a laboratory-grade plastic tube together with solutions after UV treatment presented side-by-side for comparison. Four different UV light sources were used for one minute, as in Figure 3. UV treatment was conducted with or without a microroughened titanium specimen. A histogram showing remnant methylene blue after UV treatment (%). (B) Photocatalytic contribution (%) calculated as the difference in the amount of decomposed methylene blue with and without a titanium specimen.