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首页> 外文期刊>Journal of Environmental Engineering >Reduction of nitrate, bromate, and chlorate by zero valent iron (Fe-0)
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Reduction of nitrate, bromate, and chlorate by zero valent iron (Fe-0)

机译：零价铁（Fe-0）还原硝酸盐，溴酸盐和氯酸盐

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Oxo-anions occur in drinking waters, pose potential health risks, and should be controlled. It may be possible to incorporate zero-valent iron (Fe-0) into water treatment processes to remove oxo-anions. Under near neutral pH (similar to7) and aerobic conditions, the three oxo-anions studied (NO3-, BrO3-, ClO3-) were electrochemically reduced by Fe-0 in batch and continuous-flow packed column experiments. Mass balances provided strong evidence that ammonia is the primary reduction by-product from nitrate, chloride from chlorate, and bromide from bromate. Protons were consumed during the reaction, resulting in an increase in pH (i.e., production of hydroxide). Oxo-anion removal rates decreased as follows: BrO3->ClO3->NO3. Differing rates of oxo-anion removal between batch and continuous flow column tests suggested that higher solid (Fe-0) to liquid ratios increase oxo-anion electrochemical reduction, and scaling up of batch kinetic data to larger scale must consider the solid-liquid ratios. The atomic structure (atomic radii, electron orbital configuration, electron affinity) of nitrogen, chlorine, and bromine elements of the oxo-anions, and the bond dissociation energy between these elements and oxygen, were good indicators for the relative rates of reduction by Fe-0. [References: 27]
机译：含氧阴离子存在于饮用水中，对健康构成潜在危害，应加以控制。可以将零价铁（Fe-0）掺入水处理过程中以去除含氧阴离子。在接近中性的pH（类似于7）和有氧条件下，分批和连续流填充柱实验中，Fe-0将所研究的三种含氧阴离子（NO3-，BrO3-，ClO3-）电化学还原。质量平衡提供了有力的证据，表明氨是硝酸盐，氯酸盐中的氯化物和溴酸盐中的溴化物的主要还原副产物。反应期间质子被消耗，导致pH增加（即，氢氧化物的产生）。氧阴离子去除速率降低如下：BrO3-> ClO3-> NO3。批处理和连续流色谱柱测试之间不同的氧阴离子去除速率表明，较高的固相（Fe-0）与液体比率会增加氧阴离子的电化学还原，因此将批次动力学数据扩大到较大规模时必须考虑固液比率。含氧阴离子中氮，氯和溴元素的原子结构（原子半径，电子轨道构型，电子亲和力）以及这些元素与氧之间的键解离能，是Fe相对还原速率的良好指标-0。 [参考：27]

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