State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210093, PR China.
J Hazard Mater. 2011 Sep 15;192(3):1795-803. doi: 10.1016/j.jhazmat.2011.07.015. Epub 2011 Jul 12.
The effectiveness of a two-stage reduction/subsequent oxidation (T-SRO) treatment of BDE-47, consisting of Fe-Ag reduction and Fenton-like oxidation, was investigated in this study. As an oxidation-resisting pollutant, BDE-47 (5 mg L(-1)) was difficult to be degraded by homogeneous Fe-Ag/H(2)O(2) system coupled with ultrasound (US) in 30 min. However, when this solution was firstly treated with Fe-Ag/US, the final debrominated product could be rapidly oxidized by the succeeding Fenton-like reactions, resulting in an efficient debromination of BDE-47 and a 100% mineralization of diphenyl ether (DPE). To scrutinize the degradation mechanism, several analytical techniques including HPLC, LC-MS/MS and GC/MS, were employed to monitor the major intermediates and final products. Moreover, luminescent bacteria test showed that the acute toxicity of the original solution (before reduction) was evidently lower than that of Fe-Ag/US reduction-treated solution; no toxicity was detected after Fenton-like oxidation. Evidence for the significance of a T-SRO treatment to decompose BDE-47 was presented.
本研究考察了两阶段还原/后续氧化（T-SRO）处理 BDE-47 的效果，该处理由 Fe-Ag 还原和类 Fenton 氧化组成。BDE-47（5mg/L）作为一种抗氧化污染物，在 30 分钟内很难通过均相 Fe-Ag/H2O2 体系与超声（US）耦合降解。然而，当该溶液首先用 Fe-Ag/US 处理时，随后的类 Fenton 反应可以迅速氧化最终的脱溴产物，从而有效脱溴 BDE-47 并使二苯醚（DPE）完全矿化。为了探究降解机制，采用了 HPLC、LC-MS/MS 和 GC/MS 等几种分析技术来监测主要的中间产物和最终产物。此外，发光细菌测试表明，原始溶液（还原前）的急性毒性明显低于 Fe-Ag/US 还原处理溶液；类 Fenton 氧化后未检测到毒性。证明 T-SRO 处理在分解 BDE-47 方面具有重要意义。
