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Chemical oxidation of mesoporous carbon foams for lead ion adsorption

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Title: Chemical oxidation of mesoporous carbon foams for lead ion adsorption
Authors: Burke, David M., Morris, Michael A., Holmes, Justin D. j.holmes@ucc.ie
Source: Separation & Purification Technology. Feb2013, Vol. 104, p150-159. 10p.
Subjects: Oxidation, Carbon, Foam, Mesoporous materials, Lead, Metal ions, Adsorption (Chemistry)
Abstract: Abstract: Acid treated mesoporous carbon foams, with surface areas (S BET) as high as 2207m2 g−1, were synthesised by the carbonisation of fructose over ZnCl2 templates and tested as adsorbents of Pb(II) ions from aqueous solutions. Whilst the oxidising acid treatment disrupted the morphology of the foams, it also led to a proliferation of oxide moieties on the surface of the material which acted as binding sites for Pb(II) ions. Characterisation of the oxidised surfaces by IR spectroscopy and measurement of the zero point charge (pH pzc) showed that the number of acidic surface sites increased with increasing acid concentration and temperature. The oxidised carbon foams were tested for their efficiency at removing Pb(II) ions from aqueous solutions, using batch adsorption techniques. The concentration dependence of Pb(II) ion uptake by the mesoporous carbon adsorbents could be fitted to Langmuir, Freundlich and Dubinin–Kaganer–Radushkevich (DKR) isotherms, from which the maximum adsorption capacity (Qm ) and the energy of adsorption (Ea ) was derived. Ea values obtained for the mesoporous carbon adsorbents were associated with weak adsorption (<8kJmol−1), ion exchange adsorption (8–16kJmol−1) and chelation (>16kJmol−1) depending on the surface oxidation conditions used. [Copyright &y& Elsevier]
Copyright of Separation & Purification Technology is the property of Elsevier B.V. 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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DbLabel: Engineering Source
An: 85022265
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  Data: Chemical oxidation of mesoporous carbon foams for lead ion adsorption
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  Data: Abstract: Acid treated mesoporous carbon foams, with surface areas (S BET) as high as 2207m2 g−1, were synthesised by the carbonisation of fructose over ZnCl2 templates and tested as adsorbents of Pb(II) ions from aqueous solutions. Whilst the oxidising acid treatment disrupted the morphology of the foams, it also led to a proliferation of oxide moieties on the surface of the material which acted as binding sites for Pb(II) ions. Characterisation of the oxidised surfaces by IR spectroscopy and measurement of the zero point charge (pH pzc) showed that the number of acidic surface sites increased with increasing acid concentration and temperature. The oxidised carbon foams were tested for their efficiency at removing Pb(II) ions from aqueous solutions, using batch adsorption techniques. The concentration dependence of Pb(II) ion uptake by the mesoporous carbon adsorbents could be fitted to Langmuir, Freundlich and Dubinin–Kaganer–Radushkevich (DKR) isotherms, from which the maximum adsorption capacity (Qm ) and the energy of adsorption (Ea ) was derived. Ea values obtained for the mesoporous carbon adsorbents were associated with weak adsorption (&lt;8kJmol−1), ion exchange adsorption (8–16kJmol−1) and chelation (&gt;16kJmol−1) depending on the surface oxidation conditions used. [Copyright &amp;y&amp; Elsevier]
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  Data: &lt;i&gt;Copyright of Separation &amp; Purification Technology is the property of Elsevier B.V. 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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      – Type: doi
        Value: 10.1016/j.seppur.2012.10.049
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      – Code: eng
        Text: English
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      Pagination:
        PageCount: 10
        StartPage: 150
    Subjects:
      – SubjectFull: Oxidation
        Type: general
      – SubjectFull: Carbon
        Type: general
      – SubjectFull: Foam
        Type: general
      – SubjectFull: Mesoporous materials
        Type: general
      – SubjectFull: Lead
        Type: general
      – SubjectFull: Metal ions
        Type: general
      – SubjectFull: Adsorption (Chemistry)
        Type: general
    Titles:
      – TitleFull: Chemical oxidation of mesoporous carbon foams for lead ion adsorption
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            NameFull: Burke, David M.
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            NameFull: Morris, Michael A.
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            NameFull: Holmes, Justin D.
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              M: 02
              Text: Feb2013
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              Y: 2013
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              Value: 104
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