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Impact of activation methods on persulfate oxidation of methyl tert-butyl ether

机译:活化方法对甲基叔丁基醚过硫酸盐氧化的影响

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摘要

To provide guidance on the selection of proper persulfate processes for the remediation of MTBE contaminated groundwater, MTBE aqueous solutions were treated with three common field persulfate processes including heat activated persulfate, Fe(Ⅲ)-EDTA activated persulfate and alkaline persulfate, respectively. The results were compared with MTBE oxidation by Fenton's reagent and persulfate alone at 25 ℃. The impact of the activating conditions on the fate of MTBE and its daughter products was investigated. Heat activation at 40 ℃ offered the most rapid removal of MTBE and its daughter products, while Fe(Ⅲ)-EDTA activation showed higher efficiency of MTBE removal but low removal efficiency of its daughter products, On the other hand, alkaline persulfate showed slower kinetics for the removal of MTBE and less accumulation of the daughter products, Furthermore, tert-butyl alcohol and acetone were observed as the main purgeable daughter products along with a small amount of tert-butyl formate in persulfate oxidation of MTBE, while tert-butyl formate, tert-butyl alcohol and acetone were the main products in Fenton oxidation. Mechanistic analysis suggests that degradation of MTBE by persulfate most likely happens via non-oxygen demand pathways, different from the dominant oxygen demand degradation pathways observed in Fenton oxidation.
机译:为了为选择适当的过硫酸盐工艺修复MTBE污染的地下水提供指导,MTBE水溶液分别用三种常见的现场过硫酸盐工艺进行了处理,包括热活化过硫酸盐,Fe(Ⅲ)-EDTA活化过硫酸盐和碱性过硫酸盐。将结果与Fenton试剂和过硫酸盐在25℃下的MTBE氧化进行了比较。研究了活化条件对MTBE及其子产物命运的影响。 40℃下的热活化对MTBE及其子产物的去除最快,而Fe(Ⅲ)-EDTA活化对MTBE的去除效率更高,但对子产物的去除效率低;另一方面,碱性过硫酸盐的动力学较慢。除去MTBE和减少子产物的积聚。此外,在MTBE的过硫酸盐氧化中,叔丁醇和丙酮与少量的甲酸叔丁酯一起被观察为主要可净化的子产物,而甲酸叔丁酯Fenton氧化的主要产物是叔丁醇和丙酮。机理分析表明,过硫酸盐降解MTBE最有可能通过非氧气需求途径发生,这与Fenton氧化中观察到的主要氧气需求降解途径不同。

著录项

  • 来源
    《Journal of Hazardous Materials》 |2014年第15期|521-528|共8页
  • 作者单位

    School of Chemistry and Environment, South China Normal University, Guangzhou, Guangdong 510006, China;

    School of Chemistry and Environment, South China Normal University, Guangzhou, Guangdong 510006, China;

    School of Chemistry and Environment, South China Normal University, Guangzhou, Guangdong 510006, China;

    School of Chemistry and Environment, South China Normal University, Guangzhou, Guangdong 510006, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Persulfate; In situ chemical oxidation; Methyl tert-butyl ether; Non-oxygen demand degradation; Groundwater remediation;

    机译:过硫酸盐;原位化学氧化;甲基叔丁基醚;非氧气需求下降;地下水修复;
  • 入库时间 2022-08-17 13:22:33

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