Abstract

A composite particle electrode Sn/Sb-Mn-GAC was prepared by impregnation with granular activated carbon (GAC) as carrier. The surface morphology, phase composition and electrochemical properties of the particle electrode were characterized by scanning electron microscopy, X-ray diffraction and electrochemical workstation. The results show that the Sn/Sb-Mn-GAC particles have uniform grain size, good dispersity and high oxygen evolution potential. The Sn/Sb-Mn-GAC particle electrode was used to the electrochemical degradation of 4-chlorophenol. It was shown that 4-chlorophenol was almost completely removed after electrolyzing for 60 min. A large number of intermediates were produced during the degradation of 4-chlorophenol in the experimental system. The main intermediate products were benzoquinone, 4-chlorocatechol, hydroquinone, fumaric acid, oxalic acid, etc., eventually mineralized into water and carbon dioxide. The degradation pathway of 4-chlorophenol were preliminarily suggested through the analysis of intermediates in degradation process. The supported Sn/Sb-Mn-GAC particle electrode can be repeated used 4 times in three-dimensional electrochemical reactor and the kinetic model for the electrochemical oxidation of 4-chlorophenol was established. The experimental results show that the degradation process of 4-chlorophenol accords with the first-order kinetic model, the correlation coefficient is 0.98 or more. The kinetic rate constant k of Sn/Sb-Mn-GAC particle electrode is reduced when it is repeated used, but the treatment efficiency of 4-chlorophenol is still better. The results of research show that the three-dimensional electrochemical reactor using Sn/Sb-Mn-GAC particle electrode has promising application prospects in the treatment of phenolic wastewater.

中文翻译：

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Sn / Sb-Mn-GAC复合颗粒电极降解4-氯酚的途径和动力学

摘要

以颗粒活性炭（GAC）为载体，制备了复合颗粒电极Sn / Sb-Mn-GAC。通过扫描电子显微镜，X射线衍射和电化学工作站对颗粒电极的表面形貌，相组成和电化学性能进行了表征。结果表明，Sn / Sb-Mn-GAC颗粒具有均匀的粒径，良好的分散性和较高的析氧潜力。Sn / Sb-Mn-GAC颗粒电极用于4-氯苯酚的电化学降解。结果表明，电解60分钟后，几乎完全除去了4-氯苯酚。在实验系统中4-氯苯酚降解过程中产生了大量中间体。主要中间产品为苯醌，4-氯邻苯二酚，对苯二酚，富马酸，草酸等，最终矿化为水和二氧化碳。通过分析降解过程中的中间体，初步提出了4-氯苯酚的降解途径。负载的Sn / Sb-Mn-GAC颗粒电极可在三维电化学反应器中重复使用4次，建立了4-氯苯酚电化学氧化的动力学模型。实验结果表明，4-氯苯酚的降解过程符合一级动力学模型，相关系数为0.98以上。动速率常数 负载的Sn / Sb-Mn-GAC颗粒电极可在三维电化学反应器中重复使用4次，建立了4-氯苯酚电化学氧化的动力学模型。实验结果表明，4-氯苯酚的降解过程符合一级动力学模型，相关系数为0.98以上。动速率常数 负载的Sn / Sb-Mn-GAC颗粒电极可在三维电化学反应器中重复使用4次，建立了4-氯苯酚电化学氧化的动力学模型。实验结果表明，4-氯苯酚的降解过程符合一级动力学模型，相关系数为0.98以上。动速率常数重复使用时，Sn / Sb-Mn-GAC颗粒电极的k减小，但是4-氯苯酚的处理效率仍然更好。研究结果表明，采用Sn / Sb-Mn-GAC颗粒电极的三维电化学反应器在处理含酚废水中具有广阔的应用前景。