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首页> 外文期刊>Environmental Science & Technology >Effect of Mixed Anions (HCO_3~--SO_4~(2-) ClO_4~-) on Granular Iron (Fe~0) Reactivity
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Effect of Mixed Anions (HCO_3~--SO_4~(2-) ClO_4~-) on Granular Iron (Fe~0) Reactivity

机译：混合阴离子（HCO_3〜--SO_4〜（2-）ClO_4〜-）对粒状铁（Fe〜0）反应性的影响

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摘要

Batch experiments were conducted with granular iron (Fe~0) in pH 10 solutions of 4-chloronitrobenzene (4ClNB) and mixed anions (ClO_4~-, SO_4~(2-), and HCO_3~-). In pure solutions, SO_4~(2-) is known to enhance Fe~0 reactivity, whereas HCO_3~- has been variously reported to depress Fe~0 reactivity or enhance it ClO_4~- has been found to be minimally reactive with Fe~0. It was hypothesized that the effects of the anions on reactivity were mutually independent and the combined effects could be predicted from simple mixing lines. In concentrated carbonate solutions (>25% of the bicarbonate salt content in 8 mM ionic strength solutions), the hypothesis was supported. In mixtures where the aqueous carbonate species concentrations were low (<25% of the salt content in 8 mM ionic strength solutions) an anomalous reactivity enhancement was noted. Geochemical modeling using PHREEQC suggested that precipitation of Fe(OH)_2(a) in preference to FeCO_3(s) in weak carbonate solutions freed CO_3~(2-) to corrode the iron, causing the deviation from the mixing line prediction. SEM analysis confirmed higher carbon presence on iron that had contacted carbonate rich solutions compared to iron that had not.
机译：使用粒状铁（Fe〜0）在4-氯硝基苯（4ClNB）和混合阴离子（ClO_4〜-，SO_4〜（2-）和HCO_3〜-）的pH 10溶液中进行批量实验。在纯溶液中，已知SO_4〜（2-）可增强Fe〜0反应性，而HCO_3〜-可降低Fe〜0反应性或增强Fe〜0反应性ClO_4〜-与Fe〜0的反应性最低。 。假设阴离子对反应性的影响是相互独立的，并且可以通过简单的混合线预测组合的影响。在浓碳酸盐溶液中（在8 mM离子强度溶液中> 25％的碳酸氢盐含量），该假设得到了支持。在碳酸盐水溶液种类浓度较低（<8 mM离子强度溶液中盐含量的25％）的混合物中，发现反应活性异常升高。利用PHREEQC进行的地球化学模拟表明，在弱碳酸盐溶液中，Fe（OH）_2（a）的沉淀优先于FeCO_3（s）的沉淀释放了CO_3〜（2-）腐蚀铁，从而导致与混合线预测的偏差。 SEM分析证实，与未接触碳酸盐溶液的铁相比，接触过富含碳酸盐溶液的铁中存在更高的碳。

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  • 来源
    《Environmental Science & Technology》 |2009年第15期|5975-5981|共7页
  • 作者

    ERPING BI; IAN BOWEN; J. F. DEVLIN;

  • 作者单位

    Department of Geology, Lindley Hall, University of Kansas, 1475 Jayhawk Blvd, Lawrence, Kansas 66049 and School of Water Resources and Environment, China University of Geosciences (Beijing), 29 Xueyuan Road, 100083, Beijing, China;

    Department of Geology, Lindley Hall, University of Kansas, 1475 Jayhawk Blvd, Lawrence, Kansas 66049 and School of Water Resources and Environment, China University of Geosciences (Beijing), 29 Xueyuan Road, 100083, Beijing, China;

    Department of Geology, Lindley Hall, University of Kansas, 1475 Jayhawk Blvd, Lawrence, Kansas 66049 and School of Water Resources and Environment, China University of Geosciences (Beijing), 29 Xueyuan Road, 100083, Beijing, China;

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