Scholarlink

<p>The effect of electrode configuration on the electrochemical efficiency in wastewater treatment has been investigated by several previous studies, but in a general manner. The novelty of this study is that the selection of the anode electrode was based on its corrosion performance in dye solutions. Since the dyes are used by a lot of researchers as inhibitors, it was believed that their ability to create a passive layer in these solutions has to be investigated for the selection of the anode to ensure that the anode will not lose its ability in the EC cell during treatment. Also, to investigate the influence of changing the metal type (aluminum-Al, iron-Fe, and stainless steel-SS) of the cathode on the performance of a batch electrocoagulation treatment of cation and anion dyes presented in simulated wastewater. First, corrosion potential, polarization, and Tafel and FESEM analysis were conducted to choose the best anode metal under specific conditions. Then, the best anode metal, which was found to be aluminum, was used to find the best cathode for a COD reduction from dye wastewater by using three pairs of electrodes: aluminum-aluminum (Al/Al), aluminum-iron (Al/Fe), and aluminum-stainless steel (Al/SS). The operating conditions for the second part were fixed as 300 ppm of initial concentration of both dyes (equal to 2190 ppm of COD), 1 A of applied current, initial pH 6, and 150 rpm of stirring speed along 90 min of the electrolysis period. The core results prove that the Al/Fe pair had the highest COD reduction (93.47%) after 90 min, followed by the Al/Al pair (83.26%) after 60 min, and finally Al/SS after 75 min (79.15). Based on a thermodynamic study, all electrode pairs are endothermic, ascribed to a sporadic anomaly at the liquid–solid interface and an inherent spontaneity. They obeyed the first-order kinetics of the reaction. According to the adsorption study, the Freundlich Isotherm gave the best results for Aluminum/Iron and Aluminum/Stainless Steel, and the Temkin Model resulted in the best fit for Aluminum/Aluminum. Physical or chemical adsorption proceeded based on the type of the cathode metal. The core findings, according to the corrosion study, proved that the aluminum metal was the best choice as the anode due to the absence of complete passivation on its surface that affect ions release in EC, and that the consumption of energy varied according to the type of cathode metal.</p> Graphical Abstract <p></p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Profound Analysis of Electrode-Metal and Dye-Type Synergistic Influences on COD Electrochemical Reduction: Corrosion and Kinetic Studies

  • 期刊论文

  • 发表日期：

    2026年7月29日

查看全文
  • Fatima H. Mohammed,
  • Shaymaa A. Ahmed,
  • Forat Yasir AlJaberi,
  • Armando R. Vargas

摘要

The effect of electrode configuration on the electrochemical efficiency in wastewater treatment has been investigated by several previous studies, but in a general manner. The novelty of this study is that the selection of the anode electrode was based on its corrosion performance in dye solutions. Since the dyes are used by a lot of researchers as inhibitors, it was believed that their ability to create a passive layer in these solutions has to be investigated for the selection of the anode to ensure that the anode will not lose its ability in the EC cell during treatment. Also, to investigate the influence of changing the metal type (aluminum-Al, iron-Fe, and stainless steel-SS) of the cathode on the performance of a batch electrocoagulation treatment of cation and anion dyes presented in simulated wastewater. First, corrosion potential, polarization, and Tafel and FESEM analysis were conducted to choose the best anode metal under specific conditions. Then, the best anode metal, which was found to be aluminum, was used to find the best cathode for a COD reduction from dye wastewater by using three pairs of electrodes: aluminum-aluminum (Al/Al), aluminum-iron (Al/Fe), and aluminum-stainless steel (Al/SS). The operating conditions for the second part were fixed as 300 ppm of initial concentration of both dyes (equal to 2190 ppm of COD), 1 A of applied current, initial pH 6, and 150 rpm of stirring speed along 90 min of the electrolysis period. The core results prove that the Al/Fe pair had the highest COD reduction (93.47%) after 90 min, followed by the Al/Al pair (83.26%) after 60 min, and finally Al/SS after 75 min (79.15). Based on a thermodynamic study, all electrode pairs are endothermic, ascribed to a sporadic anomaly at the liquid–solid interface and an inherent spontaneity. They obeyed the first-order kinetics of the reaction. According to the adsorption study, the Freundlich Isotherm gave the best results for Aluminum/Iron and Aluminum/Stainless Steel, and the Temkin Model resulted in the best fit for Aluminum/Aluminum. Physical or chemical adsorption proceeded based on the type of the cathode metal. The core findings, according to the corrosion study, proved that the aluminum metal was the best choice as the anode due to the absence of complete passivation on its surface that affect ions release in EC, and that the consumption of energy varied according to the type of cathode metal.

Graphical Abstract