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- W2020804629 abstract "The generation of hydroxyl (OH) radicals was investigated during ultrasonic irradiation and in the presence of TiO2. The effect of TiO2 on an ultrasonic system’s oxidation power was evaluated by examining the oxidation of salicylic acid. The generation of the salicylic acid derivatives, 2,3-dihydroxybenzoic acid (DHBA) and 2,5-DHBA, was measured by high-performance liquid chromatography coupled with electrochemical detection under different experimental conditions. The presence of TiO2 enhanced the generation of DHBA during ultrasonic irradiation, thus indicating a higher oxidation power in the ultrasonic system. Al2O3 also increased the generation of DHBA during irradiation; however, the effect of TiO2 was found to be higher than that of Al2O3. The addition of OH radical scavengers such as dimethylsulfoxide (DMSO), methanol and mannitol significantly suppressed the production of DHBA, and DMSO was found to have the highest suppressive effect among all scavengers. The effects of dissolved gases on the generation of OH radicals were further studied, and their power was found to be in the order Xe > Ar > O2 > N2. The degassing of the irradiation solution completely suppressed the generation of OH radicals. These results indicate that the presence of TiO2 accelerates the generation of OH radicals during ultrasonic irradiation, and that the process may be mediated through the induction of cavitation bubbles in irradiating solutions." @default.
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- W2020804629 date "2008-09-01" @default.
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- W2020804629 title "Sonocatalytic facilitation of hydroxyl radical generation in the presence of TiO2" @default.
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- W2020804629 doi "https://doi.org/10.1016/j.ultsonch.2008.04.011" @default.
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