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Fe2+-Catalyzed Wet Oxidation of Phenolic Acids under Different pH Values
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    Fe2+-Catalyzed Wet Oxidation of Phenolic Acids under Different pH Values
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    Department of Chemical Engineering and Environmental Technology, University of Oviedo, E-33071, Oviedo, Spain
    * To whom correspondence should be addressed. Tel.: 34985103439. Fax: 3498103434. E-mail: [email protected]
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    Industrial & Engineering Chemistry Research

    Cite this: Ind. Eng. Chem. Res. 2010, 49, 24, 12405–12413
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    https://doi.org/10.1021/ie101497s
    Published October 28, 2010
    Copyright © 2010 American Chemical Society

    Abstract

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    Catalytic oxidation in the aqueous phase of phenol and phenol-derivates present in pharmaceutical wastewaters has been investigated using FeSO4·7H2O as a homogeneous catalyst at 413 K and 1.0 MPa. Different initial pH values and catalyst concentrations have been tested, and the results obtained have been discussed taking into account the different roles that the iron plays depending on the pH value and the phenolic compound studied. The degradation rate of each pollutant assayed and the degree of mineralization achieved during the wet oxidation process were greatly affected by pH. The catalytic effect of iron(II) during the wet oxidation of phenol was only observed at pH values ranging between 2 and 3, due to the establishment of a Fe(III)/Fe(II) redox cycle. However, the best results for the catalytic oxidation of salicylic acid were obtained for pH values below 2, and they were related to the formation of an Fe(II)−salicylic acid complex. On the other hand, the presence of iron(II) had a prejudicial effect on the degradation of p-hydroxybenzoic and 5-hydroxyisophthalic acids, provoking the apparition of induction periods in both cases, due to the competition between the autoxidation of Fe(II) and the hydroxylation of the phenolic compound by the initial OH.

    Copyright © 2010 American Chemical Society

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    Cited By

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    This article is cited by 7 publications.

    1. José L. Urrea, Sergio Collado, Paula Oulego, and Mario Díaz . Formation and Degradation of Soluble Biopolymers during Wet Oxidation of Sludge. ACS Sustainable Chemistry & Engineering 2017, 5 (4) , 3011-3018. https://doi.org/10.1021/acssuschemeng.6b02664
    2. Jianfeng Ran, Xuxu Wang, Jiaping Zhao, Benkang Zhai, Haisheng Duan, Ying Chen, Shaohua Yin, Shiwei Li, Libo Zhang, Zulai Li. Ultrasound catalytic ozonation to remove 5-hydroxy-1,3-phthalic acid from strongly alkaline and high-salt solutions: Aiding nuclear waste disposal and human health. Separation and Purification Technology 2024, 345 , 127352. https://doi.org/10.1016/j.seppur.2024.127352
    3. Fabrizio Di Caprio, Pietro Altimari, Maria Luisa Astolfi, Francesca Pagnanelli. Optimization of two-phase synthesis of Fe-hydrochar for arsenic removal from drinking water: Effect of temperature and Fe concentration. Journal of Environmental Management 2024, 351 , 119834. https://doi.org/10.1016/j.jenvman.2023.119834
    4. Wenbo Liu, Nora B. Sutton, Huub H. M. Rijnaarts, Alette A. M. Langenhoff. Pharmaceutical removal from water with iron- or manganese-based technologies: A review. Critical Reviews in Environmental Science and Technology 2016, 46 (19-20) , 1584-1621. https://doi.org/10.1080/10643389.2016.1251236
    5. Sergio Collado, Adriana Laca, Mario Diaz. Effect of intermediate compounds and products on wet oxidation and biodegradation rates of pharmaceutical compounds. Chemosphere 2013, 92 (2) , 207-212. https://doi.org/10.1016/j.chemosphere.2013.03.015
    6. Anurag Garg, Alok Mishra. Degradation of Organic Pollutants by Wet Air Oxidation Using Nonnoble Metal-Based Catalysts. Journal of Hazardous, Toxic, and Radioactive Waste 2013, 17 (2) , 89-96. https://doi.org/10.1061/(ASCE)HZ.2153-5515.0000152
    7. Sergio Collado, Adriana Laca, Mario Diaz. Decision criteria for the selection of wet oxidation and conventional biological treatment. Journal of Environmental Management 2012, 102 , 65-70. https://doi.org/10.1016/j.jenvman.2012.02.018

    Industrial & Engineering Chemistry Research

    Cite this: Ind. Eng. Chem. Res. 2010, 49, 24, 12405–12413
    Click to copy citationCitation copied!
    https://doi.org/10.1021/ie101497s
    Published October 28, 2010
    Copyright © 2010 American Chemical Society

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