IDEAS home Printed from https://ideas.repec.org/a/gam/jijerp/v18y2021i6p2902-d515635.html
   My bibliography  Save this article

Simultaneous Kinetics of Selenite Oxidation and Sorption on δ-MnO 2 in Stirred-Flow Reactors

Author

Listed:
  • Zheyong Li

    (College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China
    Hubei Research Centre for Environment Pollution and Remediation, Wuhan 430070, China)

  • Yajun Yuan

    (School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, China
    Department of Environmental Engineering Design, Hubei Urban Construction Design Institute Co., Ltd., Wuhan 430051, China)

  • Lin Ma

    (CAS Key Laboratory of Aquatic Botany and Watershed Ecology, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan 430074, China)

  • Yihui Zhang

    (College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China
    Hubei Research Centre for Environment Pollution and Remediation, Wuhan 430070, China)

  • Hongwei Jiang

    (College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China
    Hubei Research Centre for Environment Pollution and Remediation, Wuhan 430070, China)

  • Jiqiang He

    (College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China
    Hubei Research Centre for Environment Pollution and Remediation, Wuhan 430070, China)

  • Yifan Hu

    (College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China
    Hubei Research Centre for Environment Pollution and Remediation, Wuhan 430070, China)

  • Shoushu Yuan

    (College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China
    Chenzhou Dongjiang Lake Water Environmental Protection Bureau, Chenzhou 423000, China)

  • Matthew Ginder-Vogel

    (Department of Civil and Environmental Engineering, University of Wisconsin-Madison, Madison, WI 53706, USA)

  • Shuxin Tu

    (College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China
    Hubei Research Centre for Environment Pollution and Remediation, Wuhan 430070, China)

Abstract

Selenium (Se) is an essential and crucial micronutrient for humans and animals, but excessive Se brings negativity and toxicity. The adsorption and oxidation of Se(IV) on Mn-oxide surfaces are important processes for understanding the geochemical fate of Se and developing engineered remediation strategies. In this study, the characterization of simultaneous adsorption, oxidation, and desorption of Se(IV) on δ-MnO 2 mineral was carried out using stirred-flow reactors. About 9.5% to 25.3% of Se(IV) was oxidized to Se(VI) in the stirred-flow system in a continuous and slow process, with the kinetic rate constant k of 0.032 h −1 , which was significantly higher than the apparent rate constant of 0.0014 h −1 obtained by the quasi-level kinetic fit of the batch method. The oxidation reaction was driven by proton concentration, and its rate also depended on the Se(IV) influent concentration, flow rate, and δ-MnO 2 dosage. During the reaction of Se(IV) and δ-MnO 2 , Mn(II) was produced and adsorbed strongly on Mn oxide surfaces, which was evidenced by the total reflectance Fourier transform infrared (ATR-FTIR) results. The X-ray photoelectron spectroscopy (XPS) data indicated that the reaction of Se(VI) on δ-MnO 2 produced Mn(III) as the main product. These results contribute to a deeper understanding of the interface chemical process of Se(IV) with δ-MnO 2 in the environment.

Suggested Citation

  • Zheyong Li & Yajun Yuan & Lin Ma & Yihui Zhang & Hongwei Jiang & Jiqiang He & Yifan Hu & Shoushu Yuan & Matthew Ginder-Vogel & Shuxin Tu, 2021. "Simultaneous Kinetics of Selenite Oxidation and Sorption on δ-MnO 2 in Stirred-Flow Reactors," IJERPH, MDPI, vol. 18(6), pages 1-16, March.
    • Handle: RePEc:gam:jijerp:v:18:y:2021:i:6:p:2902-:d:515635
    as

    Download full text from publisher

    File URL: https://www.mdpi.com/1660-4601/18/6/2902/pdf
    Download Restriction: no
    File URL: https://www.mdpi.com/1660-4601/18/6/2902/
    Download Restriction: no
    ---><---

    Corrections

    All material on this site has been provided by the respective publishers and authors. You can help correct errors and omissions. When requesting a correction, please mention this item's handle: RePEc:gam:jijerp:v:18:y:2021:i:6:p:2902-:d:515635. See general information about how to correct material in RePEc.

    If you have authored this item and are not yet registered with RePEc, we encourage you to do it here. This allows to link your profile to this item. It also allows you to accept potential citations to this item that we are uncertain about.

    We have no bibliographic references for this item. You can help adding them by using this form .

    If you know of missing items citing this one, you can help us creating those links by adding the relevant references in the same way as above, for each refering item. If you are a registered author of this item, you may also want to check the "citations" tab in your RePEc Author Service profile, as there may be some citations waiting for confirmation.

    For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: MDPI Indexing Manager (email available below). General contact details of provider: https://www.mdpi.com .

    Please note that corrections may take a couple of weeks to filter through the various RePEc services.

    IDEAS is a RePEc service. RePEc uses bibliographic data supplied by the respective publishers.