Heterogeneous Photo-Fenton Degradation of Azo Dyes over a Magnetite-Based Catalyst: Kinetic and Thermodynamic Studies DOI Open Access

Jackson Anderson S. Ribeiro,

Júlia F. Alves,

Bruno César Barroso Salgado

и другие.

Catalysts, Год журнала: 2024, Номер 14(9), С. 591 - 591

Опубликована: Сен. 3, 2024

Textile wastewater containing dyes poses significant environmental hazards. Advanced oxidative processes, especially the heterogeneous photo-Fenton process, are effective in degrading a wide range of contaminants due to high conversion rates and ease catalyst recovery. This study evaluates photodegradation azo Acid Red 18 (AR18), 66 (AR66), Orange 2 (OR2) using magnetite as catalyst. The magnetic was synthesized via hydrothermal process at 150 °C. Experiments were conducted room temperature, investigating effect dosage, pH, initial concentrations H2O2 AR18 dye. Kinetic thermodynamic studies performed 25, 40, 60 °C for three (AR18, AR66, OR2) dye structures on degradation efficiency investigated. At 25 0.33 mmolL−1 pH 3.0, 1.4 gL−1 mgL−1 under UV radiation 16.7 mWcm−2, showed 62.3% AR18, 79.6% 83.8% OR2 180 min reaction. oxidation these conditions is spontaneous endothermic. pseudo-first-order kinetic constants indicated strong temperature dependence with an order reactivity type > AR66 which associated molecular size, steric hindrance, aromatic conjugation, electrostatic repulsion, nature acid–base interactions catalytic surface.

Язык: Английский

Heterogeneous Photo-Fenton Degradation of Azo Dyes over a Magnetite-Based Catalyst: Kinetic and Thermodynamic Studies DOI Open Access

Jackson Anderson S. Ribeiro,

Júlia F. Alves,

Bruno César Barroso Salgado

и другие.

Catalysts, Год журнала: 2024, Номер 14(9), С. 591 - 591

Опубликована: Сен. 3, 2024

Textile wastewater containing dyes poses significant environmental hazards. Advanced oxidative processes, especially the heterogeneous photo-Fenton process, are effective in degrading a wide range of contaminants due to high conversion rates and ease catalyst recovery. This study evaluates photodegradation azo Acid Red 18 (AR18), 66 (AR66), Orange 2 (OR2) using magnetite as catalyst. The magnetic was synthesized via hydrothermal process at 150 °C. Experiments were conducted room temperature, investigating effect dosage, pH, initial concentrations H2O2 AR18 dye. Kinetic thermodynamic studies performed 25, 40, 60 °C for three (AR18, AR66, OR2) dye structures on degradation efficiency investigated. At 25 0.33 mmolL−1 pH 3.0, 1.4 gL−1 mgL−1 under UV radiation 16.7 mWcm−2, showed 62.3% AR18, 79.6% 83.8% OR2 180 min reaction. oxidation these conditions is spontaneous endothermic. pseudo-first-order kinetic constants indicated strong temperature dependence with an order reactivity type > AR66 which associated molecular size, steric hindrance, aromatic conjugation, electrostatic repulsion, nature acid–base interactions catalytic surface.

Язык: Английский

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