Catalytic Degradation of 4-Ethylpyridine in Water by Heterogeneous Photo-Fenton Process
<p dir="ltr">In this work, the degradation of 4-ethylpyridine (4EP) in water by a heterogeneous photo-Fenton process (H<sub>2</sub>O<sub>2</sub>/Fe<sub>3</sub>O<sub>4</sub>/ultraviolet irradiation (UV)) was investigated. More rapid and...
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| مؤلفون آخرون: | , |
| منشور في: |
2019
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| الملخص: | <p dir="ltr">In this work, the degradation of 4-ethylpyridine (4EP) in water by a heterogeneous photo-Fenton process (H<sub>2</sub>O<sub>2</sub>/Fe<sub>3</sub>O<sub>4</sub>/ultraviolet irradiation (UV)) was investigated. More rapid and effective 4EP degradation was obtained with H<sub>2</sub>O<sub>2</sub>/Fe<sub>3</sub>O<sub>4</sub>/UV than Fenton-like (H<sub>2</sub>O<sub>2</sub>/Fe<sub>3</sub>O<sub>4</sub>) and UV/H<sub>2</sub>O<sub>2,</sub> which is due to the larger production of hydroxyl radicals from the chemical and photolytic decomposition of H<sub>2</sub>O<sub>2</sub>. The operational conditions were varied during 4EP degradation experiments to evaluate the effects of pH, catalyst, concentration, and temperature on the kinetics and efficiency of H<sub>2</sub>O<sub>2</sub>/Fe<sub>3</sub>O<sub>4</sub>/UV oxidation. Under optimal conditions (100 mg/L 4EP, [H<sub>2</sub>O<sub>2</sub>] = 1000 mg/L, Fe<sub>3</sub>O<sub>4</sub> = 40 mg/L, pH = 3 and room temperature, 300 rpm), 4EP was totally declined and more than 93% of the total organic carbon (TOC) was eliminated. Liquid chromatography analysis confirmed the formation of aromatic and aliphatic intermediates (4-hydroxypyridine, 4-pyridone, malonic, oxalic, and formic acids) that resulted in being mineralized. Ion chromatography analysis demonstrated the stoichiometric release of NH4<sup>+</sup> ions during 4EP degradation by heterogeneous photo-Fenton oxidation. The reuse of the heterogeneous catalyst was evaluated after chemical and heat treatment at different temperatures. The heat-treated catalyst at 500 °C presented similar activity than the pristine Fe<sub>3</sub>O<sub>4</sub>. Accordingly, heterogeneous photo-Fenton oxidation can be an alternative method to treat wastewaters and groundwater contaminated with pyridine derivatives and other organic micropollutants. The combination of heterogeneous photo-Fenton oxidation with classical biological methods can be proposed to reduce the overall cost of the treatment in large-scale water treatment plants.</p><p dir="ltr"><br></p><h2>Other Information</h2><p dir="ltr">Published in: Applied Sciences<br>License: <a href="https://creativecommons.org/licenses/by/4.0/" target="_blank">https://creativecommons.org/licenses/by/4.0/</a><br>See article on publisher's website: <a href="https://dx.doi.org/10.3390/app9235073" target="_blank">https://dx.doi.org/10.3390/app9235073</a></p> |
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