State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, School of Resources and Environmental Engineering, East China University of Science and Technology, Shanghai 200237, PR China.
State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, School of Resources and Environmental Engineering, East China University of Science and Technology, Shanghai 200237, PR China; Shanghai Key Lab for Urban Ecological Processes and Eco-Restoration, East China Normal University, Shanghai 200239, PR China.
Chemosphere. 2018 May;198:556-564. doi: 10.1016/j.chemosphere.2018.01.083. Epub 2018 Jan 18.
S,S-ethylenediamine-N,N-disuccinic acid (EDDS) enhanced reductive dissolution of α-FeOOH by Shewanella putrefaciens CN32 (CN32), resulting in formation of surface-bound Fe(II) species (FeEDDS) to improve reductive dechlorination of carbon tetrachloride (CT). The pseudo-first-order rate constants for bio-reduction extents of α-FeOOH by CN32 in the presence of 1.36 mM EDDS was 0.023 ± 0.0003 d which was higher than without EDDS. The enhancement mechanism of bio-reduction was attributed to the strong complexation ability of EDDS to formed FeEDDS, which could be better utilized by CN32. The dechlorination kinetic of CT by FeEDDS (2.016 h) in the presence of 1.36 mM EDDS was 24 times faster than without EDDS. Chloroform were detected as main products for the degradation of CT. The chemical analyses and morphological observation showed that combination between EDDS and Fe produced FeEDDS complex, which had a reductive potential of -0.375 V and significantly enhanced CT dechlorination. The results showed that EDDS played an important role in enhancing the bio-reduction of α-FeOOH to accelerate reductive dechlorination of CT.
乙二胺二琥珀酸（EDDS）增强了腐生脱硫弧菌（CN32）对α-FeOOH 的还原溶解，形成表面结合的 Fe（II）物种（FeEDDS），从而提高四氯化碳（CT）的还原脱氯效率。在 1.36mM EDDS 存在下，CN32 还原α-FeOOH 的表观一级速率常数为 0.023±0.0003d，高于没有 EDDS 的情况。生物还原增强的机制归因于 EDDS 与形成的 FeEDDS 之间的强络合能力，这可以更好地被 CN32 利用。在 1.36mM EDDS 存在下，FeEDDS（2.016h）对 CT 的脱氯动力学比没有 EDDS 时快 24 倍。检测到氯仿是 CT 降解的主要产物。化学分析和形态观察表明，EDDS 与 Fe 结合生成 FeEDDS 配合物，其还原电位为-0.375V，显著增强了 CT 的脱氯效率。结果表明，EDDS 在增强α-FeOOH 的生物还原方面发挥了重要作用，从而加速了 CT 的还原脱氯。
