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Fe(Ⅲ)-Enhanced Sonochemical Degradation Of Methylene Blue In Aqueous Solution

机译:Fe(Ⅲ)增强亚甲基蓝在水溶液中的声化学降解

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摘要

The sonochemical degradation rate of Methylene Blue (MB) is markedly increased in the presence of Fe(Ⅲ), a rather inexpensive reagent for the application of sonochem-istry to wastewater treatment. The effect of Fe(Ⅲ) is due to a sonochemically induced Fenton reaction, where both reactants (Fe(Ⅱ) and H_2O_2) are sonochemically synthesized. Hydroperoxide/superoxide, generated upon sonochemical processes in aerated solution, is a key species involved in both Fe(Ⅲ) reduction to Fe(Ⅱ) and in the production of H_2O_2. The Fenton reaction between Fe(Ⅱ) and H_2O_2 then produces hydroxyl radicals, enhancing the degradation of MB. A further enhancement of the degradation of the substrate in the presence of Fe(Ⅲ) takes place upon addition of H_2O_2, which is likely to favor the Fenton process. Interestingly, H_2O_2 alone, in the absence of Fe(Ⅲ), has a very limited effect on the sonochemical degradation rate.
机译:Fe(Ⅲ)的存在显着提高了亚甲基蓝(MB)的声化学降解速率,Fe(Ⅲ)是一种相当便宜的用于声化学技术在废水处理中的试剂。 Fe(Ⅲ)的作用归因于声化学诱导的Fenton反应,在该反应中,两种反应物(Fe(Ⅱ)和H_2O_2)都是通过声化学合成的。曝气溶液中声化学过程中产生的氢过氧化物/超氧化物是涉及Fe(Ⅲ)还原为Fe(Ⅱ)和H_2O_2生产的关键物质。 Fe(Ⅱ)与H_2O_2之间的芬顿反应产生羟基自由基,促进了MB的降解。加入H_2O_2后,在Fe(Ⅲ)存在下,底物的降解进一步增强,这可能有利于Fenton过程。有趣的是,在没有Fe(Ⅲ)的情况下,单独的H_2O_2对声化学降解率的影响非常有限。

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