Decolorization of methylene blue in aqueous suspensions of titanium peroxide.
Decolorization of methylene blue in aqueous suspensions of titanium peroxide.
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DOI：
10.1016/j.jhazmat.2007.08.090
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发表时间：
2008-05
影响因子：
13.6
通讯作者：
C. Ogino;M. F. Dadjour;Y. Iida;N. Shimizu
中科院分区：
文献类型：
--
作者：
C. Ogino;M. F. Dadjour;Y. Iida;N. Shimizu
研究了TiO 2光催化剂在H2 O2溶液中的预处理对亚甲基蓝的脱色效果。在H2 O2溶液中孵育的TiO 2颗粒增加了TiO 2的氧化能力。在预处理的TiO 2存在下，亚甲基蓝（0.3mM）的降解，并在5.0g/L的预处理的TiO 2的存在下，48-h的孵育期后，脱色率为47%。研究了以硫酸钛和H2 O2为原料合成的稳定氧化剂过氧化钛在亚甲基蓝脱色过程中的应用。亚甲基蓝的浓度显着降低，在过氧化钛的存在下，和更大程度的脱色，得到与更大量的过氧化钛。在4.0g/L的过氧化钛存在下，孵育5 h，亚甲基蓝浓度降低63%。H2 O2促进了TiO 2的脱色过程。在含2.0g/L过氧化钛的亚甲基蓝溶液中加入100 mM的H2 O2，5 h后脱色率可达85%。羟基自由基清除剂二甲基亚砜的加入，显着降低脱色率，表明羟基自由基在氧化过程中的作用。
The pretreatment of TiO2-photocatalysts in solutions of H2O2was studied by examining the decolorization of methylene blue in the dark. Incubation of TiO2particles in H2O2solutions increased the oxidizing capacity of TiO2. Methylene blue (0.3mM) was degraded in the presence of pretreated TiO2, and a decolorizing ratio of 47% was obtained after a 48-h incubation period in the presence of 5.0g/L pretreated TiO2. Titanium peroxide as a stable oxidant, which can be synthesized with the reaction of titanium sulfate and H2O2, was studied in the decolorizing process of methylene blue. Concentrations of methylene blue were significantly reduced in the presence of titanium peroxide, and a greater extent of decolorization was obtained with larger amounts of titanium peroxide. A 63% decrease in methylene blue concentration was achieved in 5h incubation in the presence of 4.0g/L titanium peroxide. H2O2accelerated the decolorizing process in the presence of titanium peroxide. The addition of 100mM H2O2to a methylene blue solution containing 2.0g/L titanium peroxide increased the decolorizing ratio to 85% after 5h incubation. The addition of a hydroxyl radical scavenger, dimethyl sulfoxide, significantly decreased the decolorizing ratio, indicating the role of hydroxyl radicals in the oxidation process.