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首页> 外文期刊>RSC Advances >Electrocatalytic degradation of 2,4-dichlorophenol using a Pd/graphene gas-diffusion electrode
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Electrocatalytic degradation of 2,4-dichlorophenol using a Pd/graphene gas-diffusion electrode

机译：Pd /石墨烯气体扩散电极电催化降解2,4-二氯苯酚

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摘要

Palladium-modified graphene gas-diffusion cathodes were prepared using Pd/graphene catalysts and characterized using cyclic voltammetry, scanning electron microscopy, transmission electron microscopy, X-ray diffraction, Raman spectroscopy and Fourier transform infrared spectrometry. The Pd particles were amorphous and had an average size of 5.4 nm, and were highly dispersed in the graphene. A diaphragm electrolysis system sequentially fed with H-2 and air over the gas-diffusion cathodes was constructed, and applied to the degradation of 2,4-dichlorophenol (2,4-DCP). When the Pd/graphene gas-diffusion cathode was fed with hydrogen, reductive dechlorination of 2,4-DCP took place, whereas acceleration of two-electron reduction of O-2 to H2O2 proceeded in air. Dechlorination of 2,4-DCP reached approximately 96.4% after 60 min, while its removal efficiency and its removal in terms of total organic carbon (TOC) reached approximately 100% and 90.5%, respectively, after 120 min. By analysis of the electrolysis products by HPLC and IC, a reaction pathway has been proposed for the degradation of 2,4-DCP.
机译：使用钯/石墨烯催化剂制备了钯改性的石墨烯气体扩散阴极，并使用循环伏安法，扫描电子显微镜，透射电子显微镜，X射线衍射，拉曼光谱和傅里叶变换红外光谱进行了表征。 Pd颗粒是无定形的，平均尺寸为5.4 nm，并且高度分散在石墨烯中。构建了在气体扩散阴极上依次注入H-2和空气的隔膜电解系统，并将其应用于降解2,4-二氯苯酚（2,4-DCP）。当向Pd /石墨烯气体扩散阴极注入氢气时，发生了2,4-DCP的还原脱氯反应，而在空气中O-2向H2O2的两电子还原反应加速了。 60分钟后，2,4-DCP的脱氯率达到约96.4％，而120分钟后，其去除效率和总有机碳（TOC）去除率分别达到约100％和90.5％。通过用HPLC和IC分析电解产物，已经提出了降解2，4-DCP的反应途径。

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