Sonocatalytic degradation of methylene blue with TiO2 pellets in water
Sonocatalytic degradation of methylene blue with TiO2 pellets in water
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DOI：
10.1016/j.ultsonch.2006.04.002
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发表时间：
2007-02-01
影响因子：
8.4
通讯作者：
Murata, Tomoyuki
中科院分区：
文献类型：
--
作者：
Shimizu, Nobuaki;Ogino, Chiaki;Murata, Tomoyuki
采用超声辐照二氧化钛降解水溶液中的亚甲基蓝，研究了超声辐照对二氧化钛降解亚甲基蓝的影响。照射60分钟后，观察到亚甲蓝浓度的统计学显著降低。虽然减少是22%的初始浓度没有H2 O2，添加H2 O2显着增强降解亚甲基蓝的含TiO 2的系统（85%的初始浓度减少）。当体系中含有Al_2O_3时，H_2O_2的加入对亚甲基蓝的降解没有影响。亚甲基蓝的降解率取决于TiO 2的用量和溶液中TiO 2的比表面积。研究了自由基清除剂对TiO 2体系降解亚甲基蓝的影响。结果发现，自由基清除剂二甲基亚砜（DMSO），甲醇，甘露醇抑制降解，与DMSO是最有效的。进一步考察了pH值对亚甲基蓝降解的影响。在TiO 2存在下，亚甲基蓝的浓度随pH值（pH 3-12）的变化而沿着变化，并且在pH 7附近观察到最高降解率。总之，超声辐照的TiO 2在水溶液中导致显着的羟基自由基的产生，这一过程可能具有潜在的处理废水中的有机染料。(C)2006 Elsevier B. V.保留所有权利。
A series of experiments were carried out to study the degradation of methylene blue by the irradiation of ultrasound onto TiO2 in aqueous solution. A statistically significant decrease in the concentration of methylene blue was observed after 60 min irradiation. While the reduction was 22% of the initial concentration without H2O2, addition of H2O2 significantly enhanced the degradation of methylene blue for the TiO2 containing system (85% reduction of the initial concentration). The addition of H2O2 had no effect on the methylene blue degradation when the system contained Al2O3. The degradation ratio of methylene blue was dependent on the amount of TiO2 and also the specific surface area of TiO2 in the solution. The effects of radical scavenging agents on the degradation of methylene blue were also investigated for the system with TiO2. It was found that the radical scavenging agents dimethyl sulfoxide (DMSO), methanol, and mannitol suppressed the degradation, with DMSO being the most effective. The effect of pH on the degradation of methylene blue was further investigated. An U-shaped change in the concentration of methylene blue in the presence of TiO2 was observed along with the change in pH values (pH 3-12), and the highest degradation ratio was observed at around pH 7. In conclusion, ultrasound irradiation of TiO2 in aqueous solution resulted in significant generation of hydroxyl radicals, and this process may have potential for the treatment of organic dyes in wastewater. (C) 2006 Elsevier B.V. All rights reserved.