Anodic and Cathodic preparation of MnO2/Co2O3 Composite Electrode Anodes for Electro-Oxidation of Phenol

Yamama A. Ahmed, R. Salman, Fatma Kandemirli
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Abstract

The economical and highly performed anode material is the critical factor affecting the efficiency of electro-oxidation toward organics. The present study aimed to detect the best conditions to prepare Mn-Co oxide composite anode for the electro-oxidation of phenol. Deposition of Mn-Co oxide onto graphite substrate was investigated at 25, 30, and 35 mA/cm2 to detect the best conditions for deposition.  The structure and the crystal size of the Mn-Co oxide composite electrode were examined by using an X-Ray diffractometer (XRD), the morphological properties of the prepared electrode were studied by scanning electron microscopy (SEM) and Atomic force microscopy (AFM) techniques, and the chemical composition of the various deposited oxide was characterized by energy dispersive X-ray spectroscopy (EDX). The study also highlighted the effect of current density (40, 60, and 80 mA/cm2), pH (3, 4, and 5), and the concentration of NaCl (1, 1.5, and 2 g/l) on the anodic electro-oxidation of phenol was investigated.  The results revealed that the composite anodes are successfully prepared galvanostatically by anodic and cathodic deposition. In addition, the current density of 25 mA/cm2 gave the best cathodic deposition performance. The removal efficiency of phenol and other by-products increased as the current density and the concentration of NaCl in the electrolyte increased, while it decreased as the pH increased. The prepared composite electrode gave high COD removal efficiency (98.769 %) at the current density of 80 mA/cm2, pH= 3, NaCl conc. of 2 g/L within 3 h.
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用于苯酚电氧化的 MnO2/Co2O3 复合电极阳极和阴极制备方法
阳极材料的经济性和高性能是影响有机物电氧化效率的关键因素。本研究旨在检测制备用于苯酚电氧化的 Mn-Co 氧化物复合阳极的最佳条件。研究人员在 25、30 和 35 mA/cm2 下将氧化锰-氧化钴沉积到石墨基底上,以确定最佳沉积条件。 使用 X 射线衍射仪(XRD)检测了 Mn-Co 氧化物复合电极的结构和晶体尺寸,使用扫描电子显微镜(SEM)和原子力显微镜(AFM)技术研究了所制备电极的形态特性,并使用能量色散 X 射线光谱(EDX)表征了各种沉积氧化物的化学成分。研究还重点考察了电流密度(40、60 和 80 mA/cm2)、pH 值(3、4 和 5)以及 NaCl 浓度(1、1.5 和 2 g/l)对苯酚阳极电氧化的影响。 结果表明,通过阳极沉积和阴极沉积,复合阳极成功地制备出了电静电阳极。此外,电流密度为 25 mA/cm2 时的阴极沉积性能最佳。苯酚和其他副产品的去除率随着电流密度和电解液中氯化钠浓度的增加而增加,而随着 pH 值的增加而降低。在电流密度为 80 mA/cm2、pH= 3、NaCl 浓度为 2 g/L 的条件下,制备的复合电极在 3 小时内的 COD 去除率高达 98.769 %。
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12 weeks
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