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首页> 外文期刊>Electrochimica Acta >Electrochemical reductive dechlorination of 2,4-dichlorophenoxyacetic acid using a palladiumickel foam electrode
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Electrochemical reductive dechlorination of 2,4-dichlorophenoxyacetic acid using a palladiumickel foam electrode

机译：使用钯/镍泡沫电极对2,4-二氯苯氧基乙酸进行电化学还原脱氯

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摘要

The electrochemical reductive dechlorination of 2,4-dichlorophenoxyacetic acid (2,4-D) in an aqueous solution was investigated at ambient temperature using a palladiumickel foam (Pd/Ni foam) electrode in batch mode experiments. The catalytic electrode prepared using the standard chemical deposition method was further characterized using X-ray diffraction and scanning electron microscopy. It was observed that the reaction followed a pseudo-first-order kinetics model, the magnetic agitator-supported system could achieve 87% removal of 2,4-D within 4h, which is 16% higher than the efficiency obtained under a nitrogen atmosphere. No organic intermediates other than phenoxyacetic (PA), o-chlorophenoxyacetic acid (o-CPA) and p-chlorophenoxyacetic acid (p-CPA) were observed to be generated during the reaction. The dechlorination efficiency depended on several factors including the current density, the palladium loading and the initial concentrations of the supporting NaCl electrolyte and the 2,4-D. The palladium loading and the NaCl concentration had a greater effect on the dechlorination kinetics of 2,4-D. Furthermore, the efficiencies of dechlorination and PA formation could be improved by optimizing the reaction system by modifying the ventilation conditions.
机译：在室温下使用分批模式实验中的钯/镍泡沫（Pd / Ni泡沫）电极研究了水溶液中2,4-二氯苯氧基乙酸（2,4-D）的电化学还原脱氯。使用X射线衍射和扫描电子显微镜进一步表征使用标准化学沉积方法制备的催化电极。观察到反应遵循伪一级动力学模型，磁力搅拌器支持的系统可在4h内实现87％去除2,4-D，这比在氮气氛下获得的效率高16％。在反应过程中，未观察到除苯氧基乙酸（PA），邻氯苯氧基乙酸（o-CPA）和对氯苯氧基乙酸（p-CPA）以外的有机中间体。脱氯效率取决于几个因素，包括电流密度，钯负载量以及支持的NaCl电解质和2,4-D的初始浓度。钯载量和NaCl浓度对2,4-D的脱氯动力学影响更大。此外，通过改变通风条件来优化反应系统，可以提高脱氯和PA形成的效率。

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