Role of organically complexed iron(II) species in the reductive transformation of RDX in anoxic environments
Role of organically complexed iron(II) species in the reductive transformation of RDX in anoxic environments
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DOI：
10.1021/es062365a
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发表时间：
2007-02-15
影响因子：
11.4
通讯作者：
Strathmann, Timothy J.
中科院分区：
文献类型：
--
作者：
Kim, Dongwook;Strathmann, Timothy J.
有机络合铁物种可以在许多地下氧化还原过程中发挥重要作用，包括有助于土壤和水生污染物转化和降解的反应。实验结果表明，Fe-II与含邻苯二酚和硫醇的有机配体发生络合反应，生成高活性物质，将RDX（六氢-1，3，5-三硝基-1，3，5-三嗪）和相关的N-杂环硝胺爆炸物还原为甲醛和无机氮副产物。在可比条件下，相对反应速率遵循HMX 6- = 7.31（+/- 2.52）x 10（2）M-1 s（-1）。的反应产物和净化学计量（1摩尔的RDX减少每2摩尔的Fe-II氧化）支持的机制，其中RDX环的裂解和分解是由连续的1-电子转移从两个Fe-II-有机配合物。
Organically complexed iron species can play a significant role in many subsurface redox processes, including reactions that contribute to the transformation and degradation of soil and aquatic contaminants. Experimental results demonstrate that complexation of Fe-II by catechol- and thiol-containing organic ligands leads to formation of highly reactive species that reduce RDX (hexahydro-1,3,5-trinitro-1,3,5-triazine) and related N-heterocyclic nitramine explosive compounds to formaldehyde and inorganic nitrogen byproducts. Under comparable conditions, relative reaction rates follow HMX 6- = 7.31(+/- 2.52) x 10(2) M-1 s(-1). The reaction products and net stoichiometry (1 mol of RDX reduced for every 2 mol of Fe-II oxidized) support a mechanism where RDX ring cleavage and decomposition is initiated by sequential 1-electron transfers from two Fe-II-organic complexes.