Redox reactivity of organically complexed iron(II) species with aquatic contaminants
Redox reactivity of organically complexed iron(II) species with aquatic contaminants
复制标题
DOI：
10.1021/bk-2011-1071.ch014
复制
发表时间：
2011
期刊：
影响因子：
--
通讯作者：
T. Strathmann
中科院分区：
文献类型：
--
作者：
T. Strathmann
细胞外有机配体和大分子天然有机物中的配体官能团可以显着影响 Fe(II) 与水生污染物的形态和动力学氧化还原反应性。 Fe(II) 与 Fe(III) 稳定配体（例如羧酸盐、儿茶酚盐、硫醇）的络合导致形成具有低标准还原电位 (EH0) 的 Fe(II) 物质，并增强与可还原污染物（例如硝基芳烃和卤化烷烃）的反应性。 Fe(II) 减少污染物的速率变化很大，取决于特定有机配体的特性和浓度以及影响络合物形成程度的环境条件。线性自由能关系已被用来预测单个 Fe(II) 物质与污染物的水反应性。对 Fe(II) 配合物与模型配体的反应性的研究还为在更复杂的水生系统中观察到的污染物转化的潜在机制提供了机制见解，其中 Fe(II) 与更不明确的天然有机物共积累。
Extracellular organic ligands and ligand functional groups within macromolecular natural organic matter can significantly influence the speciation and kinetic redox reactivity of Fe(II) with aquatic contaminants. Fe(II) complexation by Fe(III)-stabilizing ligands (e.g., carboxylate, catecholate, thiol) leads to formation of Fe(II) species with low standard reduction potentials (EH0) and enhanced reactivity with reducible contaminants (e.g., nitroaromatics and halogenated alkanes). Rates of contaminant reduction by Fe(II) are highly variable and dependent upon the identity and concentration of specific organic ligands as well as environmental conditions that affect the extent of complex formation. Linear free energy relationships have been developed to predict the aqueous reactivity of individual Fe(II) species with contaminants. Studies on the reactivity of Fe(II) complexes with model ligands also provide mechanistic insights into the potential mechanisms responsible for contaminant transformations observed in more complex aquatic systems where Fe(II) co-accumulates with more poorly defined natural organic matter.