Water, Air, & Soil Pollution ( IF 3.8 ) Pub Date : 2021-08-11 , DOI: 10.1007/s11270-021-05295-w Tatianna Marshall 1 , Erica Pensini 1
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Zero-valent magnesium (ZVMg), glacial acetic acid (GAA), and vitamin B12 were used to degrade trichloroethylene (TCE) in either pure anhydrous ethanol (EtOH) or 10% anhydrous EtOH in canola oil. Gas chromatography–mass spectrometry (GC–MS) was used to monitor the decrease in TCE concentration within each system over time. In pure anhydrous EtOH, a vitamin B12 concentration of 49.2 mg/L achieved the highest decrease in TCE concentration by 96 ± 0.4% (with lower vitamin B12 concentration, degradation was lower). Vitamin B12 and ZVMg also performed synergistically, increasing TCE degradation by approximately 78% relative to either ZVMg or vitamin B12 alone. In pure anhydrous EtOH, with ZVMg and vitamin B12, TCE was below detection after 2 h. Degradation products were likely volatile, as they were not detected in all liquid samples. Spectrophotometric analyses indicated the formation of the super reducing species of vitamin B12 (i.e., Co(I)) after 30 min in the presence of ZVMg, explaining the significant increase in TCE degradation. TCE degradation was also tested in 10% anhydrous EtOH in canola oil, with the purpose of developing a formulation for the in situ remediation of TCE-polluted aquifers. Canola oil would promote ZVMg contact with TCE, while mitigating its oxidation due to contact with groundwater. In 10% anhydrous EtOH in canola oil, the concentration of TCE decreased by approximately 40% within 30 min, with ZVMg alone. Our study provides the first proof of concept of an efficient in situ remediation method using environmentally friendly reagents, such as vitamin B12 and canola oil, for the degradation of TCE in polluted aquifers.
Graphical abstract
中文翻译：
维生素 B12 和镁：降解三氯乙烯的健康组合
零价镁 (ZVMg)、冰醋酸 (GAA) 和维生素 B 12用于在纯无水乙醇 (EtOH) 或菜籽油中的 10% 无水乙醇中降解三氯乙烯 (TCE)。气相色谱-质谱联用 (GC-MS) 用于监测每个系统内 TCE 浓度随时间的降低。在纯无水乙醇中，浓度为 49.2 mg/L的维生素 B 12使 TCE 浓度降低了 96 ± 0.4%（维生素 B 12浓度越低，降解越低）。维生素 B 12和 ZVMg 也协同发挥作用，相对于单独使用 ZVMg 或维生素 B 12，TCE 降解增加了约 78% 。在纯无水乙醇中，含有 ZVMg 和维生素 B如图12所示，2小时后TCE低于检测值。降解产物很可能是挥发性的，因为并非在所有液体样品中都检测到它们。分光光度分析表明形成了维生素 B 12的超还原物质（即 Co(I)）在 ZVMg 存在下 30 分钟后，解释了 TCE 降解的显着增加。还在菜籽油中的 10% 无水乙醇中测试了 TCE 降解，目的是开发一种原位修复 TCE 污染含水层的配方。菜籽油将促进 ZVMg 与 TCE 的接触，同时减轻其因与地下水接触而引起的氧化。在菜籽油中 10% 的无水 EtOH 中，仅使用 ZVMg 时，TCE 的浓度在 30 分钟内降低了约 40%。我们的研究首次证明了使用环保试剂（如维生素 B 12和菜籽油）降解受污染含水层中的三氯乙烯的高效原位修复方法的概念。
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