| Fe~(2+)在零价铁还原去除NO_3~-中的作用效应 |
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| 引用本文： | 陈欢,张亚平,阮晓红.Fe~(2+)在零价铁还原去除NO_3~-中的作用效应[J].高校地质学报,2018,24(1):109. |
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| 作者姓名： | 陈欢 张亚平 阮晓红 |
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| 作者单位： | 表生地球化学教育部重点实验室南京大学地球科学与工程学院; |
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| 摘 要： | 零价铁(Fe~0)被广泛用于地下水中硝酸盐原位与异位修复,但二价铁(Fe~(2+))的存在对具有氧化膜的Fe~0还原硝酸盐的作用效应仍有待研究。以100目的未经酸化的颗粒状零价铁作为还原剂,采用室内批试验方法,研究了Fe~(2+)在零价铁还原去除NO_3~-系统中的作用效应。实验结果表明,Fe~(2+)可显著提高Fe~0对于NO_3~-的去除速率与去除效率,且Fe~(2+)浓度越高,去除速率与效率越高;由于未经酸化的Fe~0具有氧化膜,反应初期的NO_3~-还原速率较慢。Fe~(2+)将零价铁表面的Fe_2O_3氧化膜转化为Fe_3O_4,加速电子由Fe~0向NO_3~-的转移,促进NO_3~-还原。此外,在反应系统中加入Fe_3O_4,可进一步提高Fe~0对于硝酸盐的去除能力,若Fe~(2+)不存在,仅添加Fe_3O_4,NO_3~-的去除效率没有提高。
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| 关 键 词： | 零价铁 Fe2+ Fe3O4 硝酸盐还原 地下水 |
Effect of Fe2+ on Nitrate Reduction Using Zero-valent Iron |
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| CHENHuan,ZHANG Yaping,RUANXiaohong.Effect of Fe2+ on Nitrate Reduction Using Zero-valent Iron[J].Geological Journal of China Universities,2018,24(1):109. |
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| Authors: | CHENHuan ZHANG Yaping RUANXiaohong |
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| Abstract: | Zero-valent iron(Fe0) was widely used for in-situ and ex-situ remediation of nitrate in groundwater, however, it remained to
be studied that how existing of Fe2+ worked in the reduction of nitrate by Fe0 which was covered by iron oxides. In this study, batch
experiments were conducted to investigate the effect of Fe2 + on NO3- reduction using 100 mesh untreated zero-valent iron (Fe0) as
reductant. The results showed that, Fe2+ could significantly enhance the removal rate and removal efficiency of NO3- in the presence of
Fe0, and the removal efficiency increased with elevated Fe2+ concentration; but the reaction experienced an initial stage of low rate due
to the existence of oxide film on the Fe0 surface. Fe2+ could directly revolved in the reaction and transformed Fe2O3 which covers the Fe0
to Fe3O4, which accelerates the transfer of electrons from Fe0 to NO3- and promote the reduction of nitrate. What’s more, the removal
efficiency of NO3- by Fe0 will be further improved while adding Fe3O4 into the reaction system, however, with the absence of Fe2+ , the
adding of Fe3O4 only will not influence the reduction efficiency by Fe0. |
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| Keywords: | zero-valent iron Fe2+ Fe3O4 nitrate reduction groundwater |
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