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Experimental study and modeling of Pb2+ sorption by calcined ni/mo hydrotalcite in a fixed-bed column.

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Title: Experimental study and modeling of Pb2+ sorption by calcined ni/mo hydrotalcite in a fixed-bed column.
Authors: Khitous, Mohamed1 (AUTHOR) usthbkhitous@yahoo.fr, Trari, Mohamed2 (AUTHOR)
Source: Chemical Engineering Communications. 2025, Vol. 212 Issue 3, p329-344. 16p.
Subjects: Surface diffusion, Wastewater treatment, X-ray diffraction, Surface analysis, Hydrotalcite
Abstract: This study investigates the continuous flow behavior of a fixed-bed column for Pb2+ removal using calcined Ni/Mo hydrotalcite. The sorbent was characterized using FTIR, XRD, TEM, and BET surface area analysis to evaluate its removal efficiency. Experiments explored different operating conditions, such as feed flowrate (5–20 mL/min), inlet Pb2+ concentration (20–50 mg/L), bed height (10–15 cm), and solution pH (3–8). Results show that exhaustion time increased with higher bed heights, while lower flowrates, and inlet Pb2+ concentrations extended the column's lifespan. Enhanced removal capacities were observed at higher Pb2+ concentrations and bed heights, as well as with lower flowrates, particularly at an optimal solution pH of 6, due to an increased driving force. Regeneration tests demonstrated good sorbent reusability for up to five consecutive sorption–desorption cycles without affecting its removal efficiency. Therefore, calcined Ni/Mo hydrotalcite shows promising potential for treating Pb2+-containing wastewater. Analytical solutions for diffusion mechanisms were applied to predict the experimental data under various conditions, revealing that surface diffusion accurately describes the sorption kinetics (average percentage errors <5%), while pore diffusion can be neglected. The proposed model effectively predicts column performances for scaling up wastewater treatment operations. [ABSTRACT FROM AUTHOR]
Copyright of Chemical Engineering Communications is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Experimental study and modeling of Pb&lt;superscript&gt;2+&lt;/superscript&gt; sorption by calcined ni/mo hydrotalcite in a fixed-bed column.
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  Data: &lt;searchLink fieldCode=&quot;JN&quot; term=&quot;%22Chemical+Engineering+Communications%22&quot;&gt;Chemical Engineering Communications&lt;/searchLink&gt;. 2025, Vol. 212 Issue 3, p329-344. 16p.
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  Data: This study investigates the continuous flow behavior of a fixed-bed column for Pb2+ removal using calcined Ni/Mo hydrotalcite. The sorbent was characterized using FTIR, XRD, TEM, and BET surface area analysis to evaluate its removal efficiency. Experiments explored different operating conditions, such as feed flowrate (5–20 mL/min), inlet Pb2+ concentration (20–50 mg/L), bed height (10–15 cm), and solution pH (3–8). Results show that exhaustion time increased with higher bed heights, while lower flowrates, and inlet Pb2+ concentrations extended the column&#39;s lifespan. Enhanced removal capacities were observed at higher Pb2+ concentrations and bed heights, as well as with lower flowrates, particularly at an optimal solution pH of 6, due to an increased driving force. Regeneration tests demonstrated good sorbent reusability for up to five consecutive sorption–desorption cycles without affecting its removal efficiency. Therefore, calcined Ni/Mo hydrotalcite shows promising potential for treating Pb2+-containing wastewater. Analytical solutions for diffusion mechanisms were applied to predict the experimental data under various conditions, revealing that surface diffusion accurately describes the sorption kinetics (average percentage errors &lt;5%), while pore diffusion can be neglected. The proposed model effectively predicts column performances for scaling up wastewater treatment operations. [ABSTRACT FROM AUTHOR]
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  Data: &lt;i&gt;Copyright of Chemical Engineering Communications is the property of Taylor &amp; Francis Ltd and its content may not be copied or emailed to multiple sites without the copyright holder&#39;s express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.&lt;/i&gt; (Copyright applies to all Abstracts.)
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        Value: 10.1080/00986445.2024.2406018
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      – Code: eng
        Text: English
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        PageCount: 16
        StartPage: 329
    Subjects:
      – SubjectFull: Surface diffusion
        Type: general
      – SubjectFull: Wastewater treatment
        Type: general
      – SubjectFull: X-ray diffraction
        Type: general
      – SubjectFull: Surface analysis
        Type: general
      – SubjectFull: Hydrotalcite
        Type: general
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      – TitleFull: Experimental study and modeling of Pb2+ sorption by calcined ni/mo hydrotalcite in a fixed-bed column.
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          Name:
            NameFull: Khitous, Mohamed
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            NameFull: Trari, Mohamed
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            – D: 01
              M: 03
              Text: 2025
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              Y: 2025
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              Value: 212
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