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首页> 外文期刊>Environmental Science & Technology >Debromination of Polybrominated Diphenyl Ethers by Nanoscale Zerovalent Iron: Pathways, Kinetics,and Reactivity
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Debromination of Polybrominated Diphenyl Ethers by Nanoscale Zerovalent Iron: Pathways, Kinetics,and Reactivity

机译：纳米级零价铁对多溴联苯醚的脱溴作用：途径，动力学和反应性

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摘要

The debromination of selected polybrominated diphenyl ethers (PBDEs) by nanoscale zerovalent iron particles (nZVI) was studied to investigate the degradation pathways and the reaction kinetics of the PBDEs. The primary PBDE investigated was 2,3,4-tribromodiphenyl ether (BDE 21) to assess degradation pathways. nZVI could effectively debrominate the selected PBDEs into lower brominated compounds and diphenyl ether, a completely debrominated form of PBDEs. The susceptibility of the meta-bromine by nZVI was observed from the debromination tests for PBDEs with single-flanked (2,3-diBDE and 3,4-diBDE) and unflanked (three mono-BOEs) bromines. The stepwise debromination from n-bromo- to (n-1)-bromodiphenyl ether was observed as the dominant reaction process, although simultaneous multistep debromination seemed to be plausible for di-BDEs having two bromines adjacent on the same phenyl ring. The reaction rate constants were estimated by assuming the reaction between PBDEs and nZVI was a pseudo-first-order reaction and the rates decreased with fewer bromine substituents. The reaction rate constants were correlated with the heat of formation and the energy of the lowest unoccupied molecular orbital of the corresponding compounds, and these appear to be useful descriptors of relative reaction rates among PBDE homologue groups.
机译：研究了纳米级零价铁颗粒（nZVI）对选定的多溴联苯醚（PBDEs）的脱溴作用，以研究PBDEs的降解途径和反应动力学。研究的主要多溴二苯醚是2,3,4-三溴二苯醚（BDE 21），以评估降解途径。 nZVI可以有效地将选定的多溴二苯醚脱溴成低溴化的化合物和二苯醚（一种完全脱溴的多溴二苯醚形式）。从单侧面（2,3-diBDE和3,4-diBDE）和侧面（三个单BOE）溴的多溴二苯醚的脱溴试验中观察到nZVI对间溴的敏感性。观察到从正-溴到（n-1）-溴二苯醚的逐步脱溴是主要的反应过程，尽管对于在同一苯环上相邻有两个溴的二溴二苯醚似乎同时进行多步脱溴似乎是合理的。通过假设PBDEs与nZVI之间的反应是拟一级反应来估计反应速率常数，并且该速率随溴取代基的减少而降低。反应速率常数与相应化合物的形成热和最低未占据分子轨道的能量相关，这些似乎是PBDE同系物之间相对反应速率的有用描述。

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  • 来源
    《Environmental Science & Technology》 |2010年第21期|p.8236-8242|共7页
  • 作者

    YUAN ZHUANG; SUNGWOO AHN; RICHARD G. LUTHY;

  • 作者单位

    Department of Civil and Environmental Engineering, Stanford University, Stanford, California 94305-4020, United States;

    rnDepartment of Civil and Environmental Engineering, Stanford University, Stanford, California 94305-4020, United States;

    rnDepartment of Civil and Environmental Engineering, Stanford University, Stanford, California 94305-4020, 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);
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