Enhanced degradation of 2,4-dinitrotoluene by ozonation in the presence of manganese(II) and oxalic acid
Enhanced degradation of 2,4-dinitrotoluene by ozonation in the presence of manganese(II) and oxalic acid
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在锰 (II) 和草酸存在下通过臭氧化增强 2,4-二硝基甲苯的降解
DOI：
10.1016/j.molcata.2008.02.013
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发表时间：
2008-05
影响因子：
--
通讯作者：
Hua Xiao, Ruiping Liu, Xu Zhao, Jiuhui Qu
中科院分区：
文献类型：
--
作者：
Hua Xiao, Ruiping Liu, Xu Zhao, Jiuhui Qu
研究了草酸存在下锰催化臭氧氧化降解2，4-二硝基甲苯（DNT）的反应。在臭氧氧化过程中单独添加锰离子（Mn 2+）或草酸对DNT的降解没有促进作用，但Mn 2+与草酸联用对DNT的降解有促进作用。碳酸盐对催化臭氧化降解DNT的效果有一定的影响。动力学研究表明，Mn 2+催化臭氧化显著促进了臭氧的分解。电子自旋共振（ESR）实验结果表明，Mn ~（2+）和草酸在催化臭氧氧化体系中比单独臭氧氧化体系产生更多的羟基自由基。这些结果表明，催化臭氧化遵循羟基自由基型机理。Mn ~（2+）促进臭氧分解产生羟基自由基，并将其氧化为氧化锰。草酸将氧化锰还原为Mn 2+是催化过程的关键步骤。在此基础上提出了Mn 2+的循环催化机理。中间产物经HPLC和GC-MS分析，主要为芳香族有机物和脂肪族羧酸。
Manganese catalytic ozonation of 2,4-dinitrotoluene (DNT) in the presence of oxalic acid was studied. The addition of manganese ion (Mn2+) or oxalic acid alone in ozonation process did not enhance DNT degradation, but the addition of Mn2+coupled with oxalic acid accelerated degradation of DNT. The DNT degradation efficiency was influenced by carbonate in the catalytic ozonation process. Kinetics study showed that Mn2+catalytic ozonation significantly promoted the decomposition of ozone. Experimental results of electron spin resonance (ESR) demonstrated that addition of Mn2+and oxalic acid produced much hydroxyl radicals in catalytic ozonation system than that in single ozonation system. These results suggested that catalytic ozonation followed hydroxyl radical-type mechanism. Mn2+promoted decomposition of ozone to produce hydroxyl radical and it was oxidized into manganese oxide. Manganese oxide was reduced into Mn2+by oxalic acid, which is the key step of catalytic process. Based on above results, a cycle catalytic mechanism of Mn2+was proposed. Intermediates were determined by HPLC and GC–MS, and they mainly included aromatic organics and aliphatic carboxylic acids.
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影响因子：
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作者：
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通讯作者：
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影响因子：
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