...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Environmental Science & Technology >Effects of Sulfidation and Nitrate on the Reduction of N-Nitrosodimethylamine by Zerovalent Iron
【24h】

Effects of Sulfidation and Nitrate on the Reduction of N-Nitrosodimethylamine by Zerovalent Iron

机译：硫化和硝酸盐对零价铁还原N-亚硝基二甲胺的影响

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Competition among oxidizing species in groundwater and wastewater for the reductive capacity of zerovalent selectivity for reduction of contaminants over water is improved iron (ZVI) makes the selectivity of ZVI for target contaminant degradation over other reduction pathways a major determinant 4 the feasibility of ZVI-based water treatment processes. The by sulfidation, but the effect of sulfidation on other competing reactions is not known. The interaction between these competing reactions was investigated using N-nitrosodimethylamine (NDMA) as the target contaminant, nitrate as a co-contaminant, and micrometer-sized ZVI with and without sulfidation. Unsulfidated ZVI reduced NDMA to dimethylamine via N,N-dimethylhydrazine, but the addition of nitrate decreased the rate of NDMA reduction and increased the quantity of intermediate observed. With sulfidated ZVI, the kinetics and products of NDMA reduction were similar to those with unsulfidated ZVI, but no inhibitory effect of nitrate was observed. Conversely, the reduction of nitrate which dominated NDMA reduction in unsulfidated ZVI systems was strongly inhibited by sulfidation. H-2 and Fe2+ generation by sulfidated ZVI was almost independent of nitrate concentration. Therefore, sulfidation improved the efficiency of NDMA reduction by ZVI in the presence of nitrate mainly by inhibiting nitrate reduction. The shift in selectivity of ZVI for NDMA over nitrate upon sulfidation was due to replacement of Fe-0/FexOy surface sites with FeS.
机译：改良的铁（ZVI）使地下水和废水中的氧化性物质竞争零价选择性还原污染物的能力优于铁（ZVI），这使得ZVI对目标污染物降解的选择性高于其他还原途径的主要决定因素4基于ZVI的可行性水处理过程。通过硫化，但是硫化对其他竞争反应的影响尚不清楚。使用N-亚硝基二甲胺（NDMA）作为目标污染物，硝酸盐作为共污染物以及微米大小的ZVI（有或没有硫化），研究了这些竞争反应之间的相互作用。未硫化的ZVI通过N，N-二甲基肼将NDMA还原为二甲胺，但是硝酸盐的加入降低了NDMA的还原速率并增加了所观察到的中间体数量。硫化的ZVI的动力学和NDMA还原产物与未硫化的ZVI相似，但没有观察到硝酸盐的抑制作用。相反，在未硫化的ZVI系统中，以NDMA还原为主的硝酸盐还原受到了硫化的强烈抑制。硫化ZVI生成H-2和Fe2 +几乎与硝酸盐浓度无关。因此，硫化作用主要是通过抑制硝酸盐的还原而提高了硝酸盐存在下ZVI还原NDMA的效率。硫化后ZVI对NDMA的选择性相对于硝酸盐的变化是由于用FeS替代了Fe-0 / FexOy表面位点。

著录项

  • 来源
    《Environmental Science & Technology》 |2019年第16期|9744-9754|共11页
  • 作者

    Qin Hejie; Guan Xiaohong; Tratnyek Paul G.;

  • 作者单位

    Tongji Univ Coll Environm Sci & Engn State Key Lab Pollut Control & Resources Reuse Shanghai 200092 Peoples R China|Shanghai Inst Pollut Control & Ecol Secur Shanghai 200092 Peoples R China;

    Oregon Hlth & Sci Univ OHSU PSU Sch Publ Hlth 3181 SW Sam Jackson Pk Rd Portland OR 97239 USA;

  • 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

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号