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首页> 外文期刊>Environmental Science & Technology >N-Nitrosamines Formation from Secondary Amines by Nitrogen Fixation on the Surface of Activated Carbon
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N-Nitrosamines Formation from Secondary Amines by Nitrogen Fixation on the Surface of Activated Carbon

机译：通过固氮在活性炭表面上由仲胺形成N-亚硝胺

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摘要

Our previous study demonstrated that many commercial activated carbon (AC) particles may catalyze transformation of secondary amines to yield trace levels of N-nitrosamines under ambient aerobic conditions. Because of the widespread usage of AC materials in numerous analytical and environmental applications, it is imperative to understand the reaction mechanism responsible for formation of nitrosamine on the surface of ACs to mmimize their occurrence in water treatment systems and during analytical methods employing ACs. The study results show mat the AC-catalyzed nitrosamine formation requires both atmospheric oxygen and nitrogen. ACs surface reactive sites react with molecular oxygen to form reactive oxygen species (ROS), which facilitate fixation of molecular nitrogen on the carbon surfaces to generate reactive nitrogen species (RNS) likely nitrous oxide and hydroiykmine that can react with adsorbed amines to form nitrosamines. AC's properties play a crucial role as more nitrosamine formation is associated with carbon surfaces with higher surface area, more surface defects, reduced surface properties, higher O_2 uptake capacity, and higher carbonyl group content This study is a first of its kind on the nitrosamine formation mechanism involving nitrogen fixation on AC surfaces, and the information will be useful for minimization of nitrosamines in AC-based processes.
机译：我们先前的研究表明，许多商业活性炭（AC）颗粒可能在环境好氧条件下催化仲胺的转化，从而产生痕量的N-亚硝胺。由于AC材料在许多分析和环境应用中的广泛使用，因此必须了解负责在AC表面形成亚硝胺的反应机理，以最大程度地减少它们在水处理系统和采用AC的分析方法中的发生。研究结果表明，AC催化的亚硝胺的形成需要大气中的氧气和氮气。 AC的表面活性位与分子氧反应形成活性氧（ROS），从而促进分子氮在碳表面上的固定，从而生成活性氮素（RNS），可能是一氧化二氮和氢胺，它们可以与吸附的胺反应形成亚硝胺。 AC的特性起着至关重要的作用，因为更多的亚硝胺形成与具有更高表面积，更多表面缺陷，降低的表面特性，更高的O_2吸收能力和更高的羰基含量的碳表面有关。这项研究是有关亚硝胺形成的首次此类研究这种机制涉及将氮固定在AC表面上，并且该信息对于将AC基工艺中的亚硝胺减至最少有用。

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  • 来源
    《Environmental Science & Technology》 |2011年第19期|p.8368-8376|共9页
  • 作者

    Lokesh P. Padhye; Benjamin Hertzberg; Gleb Yushin; Ching-Hua Huang;

  • 作者单位

    School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States,Geosyntec Consultants, Kennesaw, Georgia 30144, United States;

    School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States;

    School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States;

    School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States;

  • 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
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