Effects of light sources and visible light-activated titanium dioxide photocatalyst on bleaching
Effects of light sources and visible light-activated titanium dioxide photocatalyst on bleaching
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DOI：
10.4012/dmj.28.693
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发表时间：
2009-11-01
影响因子：
2.5
通讯作者：
Cho, Takahiro
中科院分区：
文献类型：
--
作者：
Suyama, Yuji;Otsuki, Masayuki;Cho, Takahiro
本研究的目的是使用亚甲蓝 (NIB) 评估不同光源对两种二氧化钛 (TiO2) 光催化剂（紫外光激活 TiO2 光催化剂 (UVTiO2) 与可见光激活 TiO2 光催化剂 (VL-TiO2)）漂白作用的影响。通过将不同浓度的 H2O 和/或 TiO2 光催化剂与 MB 溶液混合来制备五种实验溶液（VL-TiO2+H2O2、UV-TiO2+H2O2、H2O2、VL-TiO2、UV-TiO2）。对于含H2O2的溶液（VL-TiO2+H2O2、UV-TiO2+H2O2和H2O2），H2O2的浓度调整为3.5%。对于四种不同的光源，使用了低强度和高强度卤素灯以及蓝色 LED LCU。所有实验溶液均用每种光源照射7分钟，每30秒测量660 nm处的吸光度，以确定MB的浓度作为漂白效果的指标。在光源效应和漂白处理之间的相互作用中，VL-TiO2+H2O2 的高强度卤素引起MB浓度的降低最显着。从光源效果来看，卤素灯比蓝光LED LCU 的漂白效果更好。
The objective of this study was to evaluate, using methylene blue (NIB), the effects of various light sources on the bleaching action of hydrogen peroxide (H2O2) with two titanium dioxide (TiO2) photocatalysts - an ultraviolet light-activated TiO2 photocatalyst (UVTiO2) versus a visible light-activated TiO2 photocatalyst (VL-TiO2). Five experimental solutions (VL-TiO2+H2O2, UV-TiO2+H2O2, H2O2, VL-TiO2, UV-TiO2) were prepared by mixing varying concentrations of H2O, and/or TiO2 photocatalyst with MB Solution. For H2O2-containing solutions (VL-TiO2+H2O2, UV-TiO2+H2O2, and H2O2), the concentration of H2O2 was adjusted to 3.5%. For the four different light sources, low- and high-intensity halogen lamps and blue LED LCUs were used. All the experimental solutions were irradiated by each of the light sources for 7 minutes, and the absorbance at 660 nm was measured every 30 seconds to determine the concentration of MB as an indicator of the bleaching effect. On the interaction between the effects of light source and bleaching treatment, the high-intensity halogen with VL-TiO2+H2O2 caused the most significant reduction in MB concentration. On the effect of light sources, the halogen lamps resulted in a greater bleaching effect than the blue LED LCUs.