Iranian Institute of Research and Development in Chemical Industries (IRDCI)-ACECR Nashrieh Shimi va Mohandesi Shimi Iran 1022-7768 44 1 2025 04 21 Decolorization of Reactive Black 5 (RB5) from Aqueous Solution Using the Electro-Fenton Process with a Metal-Organic Framework Modified Cathode Decolorization of Reactive Black 5 (RB5) from Aqueous Solution Using the Electro-Fenton Process with a Metal-Organic Framework Modified Cathode 59 76 719033 FA Mohammadreza Mehr Alizadeh Department of Physical Chemistry, Faculty of Chemistry, Tabriz University, Tabriz, Iran Bahman Abdollahi Quality Monitoring and Supervision Center of East Azerbaijan Province Water Company, IR. IRAN Department of Applied Chemistry, Faculty of Chemistry, Tabriz University, Tabriz. IR. IRAN Journal Article 2024 08 17 In this study, a composite of ZIF-8 and ZIF-67 was integrated, then pyrolyzed and calcined, and used as a cathode electrode in the electro-Fenton process to remove Reactive Black 5 (RB5) dye. The synthesized composite was characterized and identified using XRD, FTIR, SEM and BET analyses, which confirmed its desirable structure and morphology. Cyclic voltammetry analysis revealed that the Co3O4-NC/CNTs electrocatalyst exhibited superior activity compared to Co-NC/CNTs. The effects of operational parameters, including current density (mA/cm2), initial pH, initial RB5 concentration (mg/L), and process time (min), were evaluated. Parameter optimization was conducted using the response surface methodology, and the results indicated that the optimal values for current density, pH, initial RB5 concentration, and process time with Co3O4-NC/CNTs as the cathode were 30 mA/cm2, 5, 30 mg/L, and 90 min, respectively. Under optimal conditions, 93.69% of RB5 was removed. The findings confirm that the Co3O4-NC/CNTs cathode can effectively remove RB5 from contaminated water through the electro-Fenton process. In this study, a composite of ZIF-8 and ZIF-67 was integrated, then pyrolyzed and calcined, and used as a cathode electrode in the electro-Fenton process to remove Reactive Black 5 (RB5) dye. The synthesized composite was characterized and identified using XRD, FTIR, SEM and BET analyses, which confirmed its desirable structure and morphology. Cyclic voltammetry analysis revealed that the Co3O4-NC/CNTs electrocatalyst exhibited superior activity compared to Co-NC/CNTs. The effects of operational parameters, including current density (mA/cm2), initial pH, initial RB5 concentration (mg/L), and process time (min), were evaluated. Parameter optimization was conducted using the response surface methodology, and the results indicated that the optimal values for current density, pH, initial RB5 concentration, and process time with Co3O4-NC/CNTs as the cathode were 30 mA/cm2, 5, 30 mg/L, and 90 min, respectively. Under optimal conditions, 93.69% of RB5 was removed. The findings confirm that the Co3O4-NC/CNTs cathode can effectively remove RB5 from contaminated water through the electro-Fenton process.

https://www.nsmsi.ir/article_719033_209ccf6d7f79630ffffc331186f4bfcb.pdf