Effect of mixing on reductive dechlorination of persistent organic pollutants by Fe/Pd nanoparticles
Effect of mixing on reductive dechlorination of persistent organic pollutants by Fe/Pd nanoparticles
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DOI：
10.1002/wer.1018
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发表时间：
2019-02
影响因子：
3.1
通讯作者：
Abdellatif Moujahid;J. Bang;Fei Yan
中科院分区：
文献类型：
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作者：
Abdellatif Moujahid;J. Bang;Fei Yan
在此，我们报告了使用铁/钯（Fe/Pd）双金属纳米颗粒对γ -六氯环己烷（γ - HCH）、aldrin和p， p ' -二氯二苯基-三氯乙烷（p, p ' - DDT）进行还原脱氯的两种不同混合方法的比较。在超声浴中进行还原性脱氯反应时，反应速率明显提高。这些增强可归因于(a)声空化的化学和物理联合效应对纳米级Fe/Pd双金属纳米颗粒表面的连续清洗和化学活化；(b)目标持久性有机污染物向Fe/Pd纳米颗粒表面的加速质量传输速率。最后，通过气相色谱/质谱（GC/MS）分析确定了降解中间体和最终产物，并提出了Fe/Pd双金属纳米颗粒降解γ - HCH、aldrin和p， p ' - DDT的可能途径。
Herein, we report the comparison of two different mixing methods for reductive dechlorination of gamma‐hexachlorocyclohexane (γ‐HCH), aldrin, and p, p’‐dichlorodiphenyl‐trichloroethane (p, p’‐DDT), using iron/palladium (Fe/Pd) bimetallic nanoparticles. A noticeable enhancement of the reaction rate was found when the reductive dechlorination reaction was carried out in an ultrasound bath as compared with a platform shaker. These enhancements could be attributed to (a) the continuous cleaning and chemical activation of the surfaces of nanoscale Fe/Pd bimetallic nanoparticles by the combined chemical and physical effects of acoustic cavitation; and (b) the accelerated mass transport rates of target POPs to the surfaces of the Fe/Pd nanoparticles. Finally, the degradation intermediates and final products were determined by gas chromatography/mass spectrometry (GC/MS) analysis and the plausible degradation pathways for γ‐HCH, aldrin, and p, p’‐DDT by Fe/Pd bimetallic nanoparticles were proposed.