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The Effect of the Sodium Introduction Method on the Acid-Base and Adsorption Properties of Alumina.

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Title: The Effect of the Sodium Introduction Method on the Acid-Base and Adsorption Properties of Alumina.
Authors: Meshcheryakov, Eugene P.1 (AUTHOR) meevgeni@mail.ru, Shcherbakova-Sandu, Mariya P.1 (AUTHOR) mpsandu94@gmail.com, Vasilyeva, Irina A.2 (AUTHOR), Kurzina, Irina A.1 (AUTHOR)
Source: Russian Journal of Applied Chemistry. Feb2026, Vol. 99 Issue 2, p61-70. 10p.
Subjects: Sodium ions, Acid-base chemistry, Scientific method, Photoelectron spectroscopy, X-ray diffraction, Aluminum oxide, Water purification adsorption, Physisorption
Abstract: We investigated the effect of sodium cation modification on the acid-base and adsorption properties of alumina synthesized via centrifugal thermal activation of gibbsite. Two methods of modification were compared: post-synthesis impregnation of finished granules and in situ incorporation of sodium cations during the hydration stage of the precursor. The resulting adsorbents were characterized using X-ray diffraction (XRD) and low-temperature nitrogen adsorption. Their acid-base properties were assessed using a pH-metric method and X-ray photoelectron spectroscopy (XPS). All of the samples obtained consisted of low-temperature modifications, had a specific surface area above 200 m2/g, and were characterized by the presence of small mesopores (2–15 nm). The surface basicity of the alumina samples was found to increase directly with the concentration of introduced sodium, as quantified by the isoionic point pH (pHiip). A strong correlation was observed between the XPS data and the pH-metric method results, confirming the applicability of XPS for evaluating the acid-base characteristics of modified adsorbents. The experimental data on the effect of introducing sodium into alumina on water vapor adsorption were compared with previous results obtained by researchers using various modification methods. The results demonstrated that dynamic water vapor adsorption capacity is influenced by the characteristics of Al2O3 and the method of sodium introduction. The most effective method for modifying aluminum oxide is introducing it at the hydration stage during synthesis. The results demonstrate the possibility of controlling the adsorption properties of alumina by varying the concentration of sodium cations and the synthesis conditions. [ABSTRACT FROM AUTHOR]
Copyright of Russian Journal of Applied Chemistry is the property of Springer Nature 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.)
Database: Engineering Source
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DbLabel: Engineering Source
An: 192007824
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  Data: The Effect of the Sodium Introduction Method on the Acid-Base and Adsorption Properties of Alumina.
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  Data: <searchLink fieldCode="AR" term="%22Meshcheryakov%2C+Eugene+P%2E%22">Meshcheryakov, Eugene P.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> meevgeni@mail.ru</i><br /><searchLink fieldCode="AR" term="%22Shcherbakova-Sandu%2C+Mariya+P%2E%22">Shcherbakova-Sandu, Mariya P.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> mpsandu94@gmail.com</i><br /><searchLink fieldCode="AR" term="%22Vasilyeva%2C+Irina+A%2E%22">Vasilyeva, Irina A.</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Kurzina%2C+Irina+A%2E%22">Kurzina, Irina A.</searchLink><relatesTo>1</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Russian+Journal+of+Applied+Chemistry%22">Russian Journal of Applied Chemistry</searchLink>. Feb2026, Vol. 99 Issue 2, p61-70. 10p.
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  Data: <searchLink fieldCode="DE" term="%22Sodium+ions%22">Sodium ions</searchLink><br /><searchLink fieldCode="DE" term="%22Acid-base+chemistry%22">Acid-base chemistry</searchLink><br /><searchLink fieldCode="DE" term="%22Scientific+method%22">Scientific method</searchLink><br /><searchLink fieldCode="DE" term="%22Photoelectron+spectroscopy%22">Photoelectron spectroscopy</searchLink><br /><searchLink fieldCode="DE" term="%22X-ray+diffraction%22">X-ray diffraction</searchLink><br /><searchLink fieldCode="DE" term="%22Aluminum+oxide%22">Aluminum oxide</searchLink><br /><searchLink fieldCode="DE" term="%22Water+purification+adsorption%22">Water purification adsorption</searchLink><br /><searchLink fieldCode="DE" term="%22Physisorption%22">Physisorption</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: We investigated the effect of sodium cation modification on the acid-base and adsorption properties of alumina synthesized via centrifugal thermal activation of gibbsite. Two methods of modification were compared: post-synthesis impregnation of finished granules and in situ incorporation of sodium cations during the hydration stage of the precursor. The resulting adsorbents were characterized using X-ray diffraction (XRD) and low-temperature nitrogen adsorption. Their acid-base properties were assessed using a pH-metric method and X-ray photoelectron spectroscopy (XPS). All of the samples obtained consisted of low-temperature modifications, had a specific surface area above 200 m2/g, and were characterized by the presence of small mesopores (2–15 nm). The surface basicity of the alumina samples was found to increase directly with the concentration of introduced sodium, as quantified by the isoionic point pH (pHiip). A strong correlation was observed between the XPS data and the pH-metric method results, confirming the applicability of XPS for evaluating the acid-base characteristics of modified adsorbents. The experimental data on the effect of introducing sodium into alumina on water vapor adsorption were compared with previous results obtained by researchers using various modification methods. The results demonstrated that dynamic water vapor adsorption capacity is influenced by the characteristics of Al2O3 and the method of sodium introduction. The most effective method for modifying aluminum oxide is introducing it at the hydration stage during synthesis. The results demonstrate the possibility of controlling the adsorption properties of alumina by varying the concentration of sodium cations and the synthesis conditions. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Russian Journal of Applied Chemistry is the property of Springer Nature 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.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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        Value: 10.1134/S1070427225601615
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      – Code: eng
        Text: English
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      Pagination:
        PageCount: 10
        StartPage: 61
    Subjects:
      – SubjectFull: Sodium ions
        Type: general
      – SubjectFull: Acid-base chemistry
        Type: general
      – SubjectFull: Scientific method
        Type: general
      – SubjectFull: Photoelectron spectroscopy
        Type: general
      – SubjectFull: X-ray diffraction
        Type: general
      – SubjectFull: Aluminum oxide
        Type: general
      – SubjectFull: Water purification adsorption
        Type: general
      – SubjectFull: Physisorption
        Type: general
    Titles:
      – TitleFull: The Effect of the Sodium Introduction Method on the Acid-Base and Adsorption Properties of Alumina.
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            NameFull: Meshcheryakov, Eugene P.
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            NameFull: Shcherbakova-Sandu, Mariya P.
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            NameFull: Vasilyeva, Irina A.
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            – D: 01
              M: 02
              Text: Feb2026
              Type: published
              Y: 2026
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              Value: 99
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            – TitleFull: Russian Journal of Applied Chemistry
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