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首页> 外文期刊>Chemical engineering journal >Influence of environmental factors on the electrocatalytic dechlorination of 2,4-dichlorophenoxyacetic acid on nTiN doped Pd/Ni foam electrode
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Influence of environmental factors on the electrocatalytic dechlorination of 2,4-dichlorophenoxyacetic acid on nTiN doped Pd/Ni foam electrode

机译：环境因素对nTiN掺杂Pd / Ni泡沫电极上2,4-二氯苯氧基乙酸电催化脱氯的影响

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摘要

In this study, nanosized titanium nitride (nTiN) doped palladiumickel (Pd/Ni) foam electrodes were prepared via electroless deposition method for the dechlorination of 2,4-dichlorophenoxyacetic acid (2,4-D). Characterization analyses including field emission scanning electron microscopy (FE-SEM), energy dispersive X-ray spectroscopy (EDX) and transmission electron microscopy (TEM) revealed that nTiN was successfully doped onto the electrode surface. 2,4-D was first dechlorinated to intermediate products p-chlorophenoxyacetic acid (p-CPA) or o-chlorophenoxyacetic acid (o-CPA) and then to the final product, phenoxyacetic acid (PA). The effects of environmental factors including initial 2,4-D concentration, current density, reaction temperature and dissolved anions were also studied. High initial 2,4-D concentration increased the efficient utilization of active hydrogen atom [H] by nTiN doped Pd/Ni foam electrodes. Increases in current density promoted better dechlorination efficiency while the hydrogen evolution side reaction was undesirably increased, leading to a lower average current efficiency. Higher reaction temperature was proved to be favorable for the enhancement of dechlorination efficiency. NO3- and reduced sulfur compounds including S2- and SO32- showed negative impacts on Pd catalytic capability, whereas CO32- and cl(-) exhibited less adverse effects on dechlorination efficiency. The activation energy (Ea) value of 2,4-D dechlorination by nTiN doped Pd/Ni foam electrode was calculated to be 32.06 kJ mol(-1). Two typical stages namely electrode activation and efficient dechlorination procedures occurred in 2,4-D dechlorination by nTiN doped Pd/Ni foam electrodes. The reaction paths of [H] on the electrode were also summarized. The removal efficiency of 2,4-D dechlorination on nTiN doped Pd/Ni foam electrodes was observed to slightly decrease from 100% to 89.95% after 5 consecutive experiments. (C) 2015 Elsevier B.V. All rights reserved.
机译：在这项研究中，通过化学沉积方法制备了纳米尺寸的氮化钛（nTiN）掺杂的钯/镍（Pd / Ni）泡沫电极，用于2,4-二氯苯氧基乙酸（2,4-D）的脱氯。包括场发射扫描电子显微镜（FE-SEM），能量色散X射线光谱（EDX）和透射电子显微镜（TEM）在内的表征分析表明，nTiN已成功掺杂到电极表面。首先将2,4-D脱氯成中间产物对氯苯氧基乙酸（p-CPA）或邻氯苯氧基乙酸（o-CPA），然后再脱除最终产物苯氧基乙酸（PA）。还研究了环境因素的影响，包括初始2,4-D浓度，电流密度，反应温度和溶解的阴离子。高初始2,4-D浓度提高了nTiN掺杂的Pd / Ni泡沫电极对活性氢原子[H]的有效利用。电流密度的增加促进了更好的脱氯效率，而析氢副反应却不希望地增加，导致平均电流效率降低。已证明较高的反应温度有利于提高脱氯效率。 NO3-和还原硫化合物（包括S2-和SO32-）对Pd的催化能力有负面影响，而CO32-和cl（-）对脱氯效率的不利影响较小。经nTiN掺杂的Pd / Ni泡沫电极对2,4-D脱氯的活化能（Ea）值计算为32.06 kJ mol（-1）。 nTiN掺杂的Pd / Ni泡沫电极在2,4-D脱氯过程中发生了两个典型的阶段，即电极活化和有效的脱氯过程。还总结了[H]在电极上的反应路径。在连续5次实验后，观察到在nTiN掺杂的Pd / Ni泡沫电极上2,4-D脱氯的去除效率从100％略降至89.95％。 （C）2015 Elsevier B.V.保留所有权利。

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