Photocatalytic Degradation of Azo Dyes over Magnetite-Based Catalyst: Kinetic, Thermodynamic and Structure-Activity Studies

Published: Aug. 8, 2024

Textile wastewater containing dyes pose 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 photocatalytic degradation 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 efficiency investigated. At 25 °C 0.33 mmol.L-1 pH 3.0, 1.4 g.L-1 60 mg.L-1 under UV radiation 16.7 mW.cm-2 showed 62,3% AR18, 79.6% AR66, 83.8% OR2 180 minutes reaction. oxidation these conditions is spontaneous endothermic. pseudo-first order kinetic constants indicated strong temperature dependence with an reactivity type: > which associated characteristics molecular complexity (size, steric hindrance, aromatic conjugation), electrostatic repulsion nature acid-base interactions catalytic surface.

Language: Английский

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Synthesis of ZnO/g-C3N4 Composites Obtained by Pyrolysis of a Ternary Deep Eutectic Solvent and Their Application as Catalysts in Different AOPs

Applied Sciences, Journal Year: 2025, Volume and Issue: 15(5), P. 2475 - 2475

Published: Feb. 25, 2025

This study investigates the synthesis and evaluation of ZnO/g-C3N4 composites as efficient green catalysts for advanced oxidation processes (AOPs) targeting treatment contaminated water. The were synthesized using a ternary deep eutectic solvent physically–chemically characterized in detail, confirming their structural integrity successful synthesis. Photocatalytic, photo-Fenton- electro-Fenton-like experiments conducted Rhodamine B model contaminant to evaluate catalytic performance, reuse stability material. demonstrated excellent photocatalytic activity under LED light (395 nm), achieving pollutant removal around 59% 90 min. combined effect designed catalyst Fenton-like process, photo-Fenton-like significantly improved this close 95% 60 min due synergistic effects irradiation H2O2 activation. Finally, action process exhibited superior efficiency, 90% within 45 kinetic constants four times higher than those anodic alone. In addition, studies confirmed several cycles with high efficiencies, demonstrating viability long-term scalable water applications. These findings highlight potential through DES sustainable cost-effective alternative remediation technologies.

Language: Английский

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Zeolite Modification for Optimizing Fenton Reaction in Methylene Blue Dye Degradation

Colorants, Journal Year: 2025, Volume and Issue: 4(1), P. 10 - 10

Published: March 5, 2025

Textile dyes often prove resistant to conventional wastewater treatment processes because of their complex molecular structures. Advanced oxidation methods, such as the Fenton reaction, have thus been recognized a promising approach for environmental remediation by decomposing these pollutants. This work aimed study efficacy modified zeolites catalysts in reaction dye degradation, with particular emphasis on techniques modifying and incorporating iron. The zeolite ZSM-5 was selected parent structure underwent desilication acid procedures. Iron introduced into via two distinct methods: ion exchange mechanochemistry. incorporated iron were evaluated terms crystallinity, textural properties, content before being used degrade methylene blue solutions through reaction. monitored using UV-Vis spectroscopy, while experimental outcomes analyzed pseudo-first-order pseudo-second-order kinetic models. research findings indicate that different methods led varying impacts which turn influenced results. Moreover, it observed an enhancement degradation process can be achieved harmonious balance between high content, increased mesoporosity (to facilitate diffusion), adequate crystallinity (essential maintaining structural integrity).

Language: Английский

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Design of a Z-Scheme System with g-C3N4/WO3/ZnFe2O4 Nanocomposite for Photocatalytic Degradation of Rhodamine B

Journal of Cluster Science, Journal Year: 2025, Volume and Issue: 36(3)

Published: April 21, 2025

Language: Английский

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Synthesis, properties, and applications of Fe3O4 and Fe3O4-based nanocomposites: A review

Applied Catalysis O Open, Journal Year: 2025, Volume and Issue: unknown, P. 207049 - 207049

Published: April 1, 2025

Language: Английский

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