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Different Magnetization Levels of Magnetite–Chitosan Nanocomposites for Co (II) Adsorption from Natural Waters.

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Title: Different Magnetization Levels of Magnetite–Chitosan Nanocomposites for Co (II) Adsorption from Natural Waters.
Authors: Šemčuk, Sergej1,2 (AUTHOR) sergej.semcuk@ftmc.lt, Jurgelėnė, Živilė2 (AUTHOR), Pakštas, Vidas1 (AUTHOR), Montvydienė, Danguolė2 (AUTHOR), Drabavičius, Audrius1 (AUTHOR), Jokšas, Kęstutis2 (AUTHOR), Talaikis, Martynas1 (AUTHOR), Mažeika, Jonas2 (AUTHOR), Mažeika, Kęstutis1 (AUTHOR), Kuzborskaja, Karina1 (AUTHOR), Lujanienė, Galina1 (AUTHOR)
Source: Nanomaterials (2079-4991). Apr2026, Vol. 16 Issue 7, p393. 22p.
Subjects: Water purification, Magnetization, Nanostructured materials, Nanocomposite materials, Physisorption, Biopolymers, Hydrosphere (Earth), Radiochemical purification
Abstract: Biopolymers such as chitosan are considered important candidates for water purification due to their non-toxicity, biodegradability, natural origin, biocompatibility, and potential for modification to provide additional capabilities, such as incorporating nanomaterials for magnetism to enable rapid separation or adding functional groups to enhance selectivity towards target adsorbates. This study investigated adsorption of Co (II), traced by Co-60 radionuclide, systematically evaluated in natural aquatic matrices selected according to water body type: seawater (Baltic Sea) and freshwater systems further distinguished as lentic (Lake Balsys) and lotic (Neris River) environments, using synthesized magnetite–chitosan nanocomposites (MCNs) with varying loadings of Fe3O4 (10–30 wt. %) nanoparticles providing different levels of magnetization. Comprehensive characterization (TEM, FTIR, AFM, XRD, and Mössbauer spectroscopy) confirmed successful integration of magnetite nanoparticles within the chitosan matrix and reproducible structural properties. An optimal magnetization of 11 emu/g was achieved at 20 wt. % Fe3O4, enabling rapid magnetic separation within <1 min without compromising sorption capacity. Adsorption isotherm models were applied to investigate the adsorption parameters, and sorption kinetics were studied, yielding a maximum adsorption capacity of 14.93 mg/g for MCN-10 in seawater and 11.95 mg/g for MCN-20 in freshwater with observed equilibrium within 120 min. These promising results indicate that the MCN is a suitable nanocomposite for the removal of Co (II) ions and the Co-60 radionuclide from aquatic media. [ABSTRACT FROM AUTHOR]
Copyright of Nanomaterials (2079-4991) is the property of MDPI 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: Different Magnetization Levels of Magnetite–Chitosan Nanocomposites for Co (II) Adsorption from Natural Waters.
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  Data: &lt;searchLink fieldCode=&quot;JN&quot; term=&quot;%22Nanomaterials+%282079-4991%29%22&quot;&gt;Nanomaterials (2079-4991)&lt;/searchLink&gt;. Apr2026, Vol. 16 Issue 7, p393. 22p.
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  Data: Biopolymers such as chitosan are considered important candidates for water purification due to their non-toxicity, biodegradability, natural origin, biocompatibility, and potential for modification to provide additional capabilities, such as incorporating nanomaterials for magnetism to enable rapid separation or adding functional groups to enhance selectivity towards target adsorbates. This study investigated adsorption of Co (II), traced by Co-60 radionuclide, systematically evaluated in natural aquatic matrices selected according to water body type: seawater (Baltic Sea) and freshwater systems further distinguished as lentic (Lake Balsys) and lotic (Neris River) environments, using synthesized magnetite–chitosan nanocomposites (MCNs) with varying loadings of Fe3O4 (10–30 wt. %) nanoparticles providing different levels of magnetization. Comprehensive characterization (TEM, FTIR, AFM, XRD, and M&#246;ssbauer spectroscopy) confirmed successful integration of magnetite nanoparticles within the chitosan matrix and reproducible structural properties. An optimal magnetization of 11 emu/g was achieved at 20 wt. % Fe3O4, enabling rapid magnetic separation within &lt;1 min without compromising sorption capacity. Adsorption isotherm models were applied to investigate the adsorption parameters, and sorption kinetics were studied, yielding a maximum adsorption capacity of 14.93 mg/g for MCN-10 in seawater and 11.95 mg/g for MCN-20 in freshwater with observed equilibrium within 120 min. These promising results indicate that the MCN is a suitable nanocomposite for the removal of Co (II) ions and the Co-60 radionuclide from aquatic media. [ABSTRACT FROM AUTHOR]
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  Data: &lt;i&gt;Copyright of Nanomaterials (2079-4991) is the property of MDPI 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: 10.3390/nano16070393
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      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 22
        StartPage: 393
    Subjects:
      – SubjectFull: Water purification
        Type: general
      – SubjectFull: Magnetization
        Type: general
      – SubjectFull: Nanostructured materials
        Type: general
      – SubjectFull: Nanocomposite materials
        Type: general
      – SubjectFull: Physisorption
        Type: general
      – SubjectFull: Biopolymers
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      – SubjectFull: Hydrosphere (Earth)
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      – SubjectFull: Radiochemical purification
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      – TitleFull: Different Magnetization Levels of Magnetite–Chitosan Nanocomposites for Co (II) Adsorption from Natural Waters.
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            – D: 01
              M: 04
              Text: Apr2026
              Type: published
              Y: 2026
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