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首页> 外文期刊>Environmental Science & Technology >Enhanced Corrosion-Based Pd/Mg Bimetallic Systems for Dechlorination of PCBs
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Enhanced Corrosion-Based Pd/Mg Bimetallic Systems for Dechlorination of PCBs

机译：增强型基于腐蚀的Pd / Mg双金属系统，用于PCB的脱氯

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摘要

Polychlorinated biphenyls (PCBs) are toxic pollutants notorious for their aquatic and sedimentary prevalence and recalcitrant nature. Bimetallic systems like Pd/Fe have been widely studied for degrading them. Mg, with oxidation potential higher than Fe, has been reported to dechlorinate PCBs in conjunction with K_2PdCl_6-systems that are distinct from Pd/Mg bimetals. This study primarily aims to evaluate Pd/Mg bimetallic systems for dechlorinating 2-chlorobiphenyl (2-CIBP), a model PCB. Candidacy of Mg is based on its unique corrosion properties that afford synthesis and storage under ambient conditions and application-based advantages. A simple wet-chemistry procedure was developed to synthesize Pd/Mg particles with 0.11-1.62% Pd content and nanoscale Pd-islands as determined by X-ray diffraction (XRD) and environmental scanning electron microscopy (ESEM). Aqueous 2-CIBP matrices were effectively degraded using these particles, the dechlorination kinetics showing linear dependence on the total Pd content. The pH profile obtained with varying bimetallic content led to useful insights into the unique behavior of Mg surface. A carbon mole balance showed 85-105% recoveries. Performance of the Pd/Mg particles in PCB spiked clays and sediment suggests that they may work well in such systems. Finally, a mechanism for PCB dechlorination in Pd/Mg systems was proposed.
机译：多氯联苯（PCBs）是有毒污染物，因其水生和沉积流行以及顽固性而臭名昭著。诸如Pd / Fe之类的双金属系统已被广泛研究以降解它们。据报道，氧化电位高于Fe的Mg与K_2PdCl_6-系统（与Pd / Mg双金属不同）一起对PCB进行脱氯。这项研究的主要目的是评估PCB样板2-氯联苯（2-CIBP）的Pd / Mg双金属体系。 Mg的候选资格基于其独特的腐蚀性能，可在环境条件下进行合成和存储，并具有基于应用的优势。通过X射线衍射（XRD）和环境扫描电子显微镜（ESEM）的测定，开发了一种简单的湿化学程序来合成Pd / Mg颗粒，其中Pd含量为0.11-1.62％。使用这些颗粒可有效降解2-CIBP水溶液，脱氯动力学显示出对总Pd含量的线性依赖性。通过改变双金属含量获得的pH分布图有助于了解镁表面的独特行为。碳摩尔平衡显示出85-105％的回收率。 Pd / Mg颗粒在多氯联苯加标的粘土和沉积物中的性能表明，它们在此类系统中可能表现良好。最后，提出了Pd / Mg体系中PCB脱氯的机理。

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