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Secondarily modified polyamide-based multifunctional adsorbent for efficient removal of U(VI) from radioactive wastewater.

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Title: Secondarily modified polyamide-based multifunctional adsorbent for efficient removal of U(VI) from radioactive wastewater.
Authors: Li, Xu-Xin1 (AUTHOR), Wang, Ze-Yang1 (AUTHOR), Zhang, Feng1 (AUTHOR), Wang, Wei-Jia1 (AUTHOR), Huang, Qing-Gang2 (AUTHOR) huangqg@impcas.ac.cn, Yan, Ze-Yi1 (AUTHOR) yanzeyi@lzu.edu.cn
Source: Journal of Radioanalytical & Nuclear Chemistry. May2026, Vol. 335 Issue 5, p3597-3610. 14p.
Subject Terms: *Adsorption (Chemistry), *Radioactive waste management, *Adsorption kinetics, *Langmuir isotherms, *Polymeric sorbents, *Wastewater treatment
Abstract: Adsorption has been widely acknowledged as a high-efficiency method for treating uranium-containing wastewater. In this work, a novel polyamide acid (PAA-AO) remodified by amidoxime was designed as uranium(VI) adsorbent, and successfully synthesized by grafting amidoxime (AO) onto a polyamide acid (PAA) backbone via cyanomethyl linkages. The resulting adsorbent containing substantial amide, carboxyl, and amidoxime groups, was utilized to address U(VI) contamination in environmental systems. The adsorption behavior of PAA-AO to U(VI) was fully investigated using batch experiments. The results showed that PAA-AO removed over 75% of U(VI) across the pH range of 4.0 to 7.0, with a maximum capacity of 370.4 mg/g at pH 6.0. The kinetic analysis indicated that the adsorption process conformed to the pseudo-second-order model, while isothermal data were best described by the Langmuir model. Thermodynamic studies confirmed that U(VI) adsorption onto PAA-AO was endothermic and spontaneous. PAA-AO adsorbent displayed the superior selectivity for U(VI) in the presence of competing metal ions. The mechanistic investigations via FT-IR and XPS demonstrated that C = O of carboxyl/malonamide and –NH2 (and/or –NH–) of amidoxime played the key roles in adsorption through strong coordination with U(VI). The proposal of cyanomethylation-secondary-modification provides an effective idea for the design of novel amidoxime-based adsorbent. [ABSTRACT FROM AUTHOR]
Database: Energy & Power Source
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Header DbId: enr
DbLabel: Energy & Power Source
An: 194006676
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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  Label: Title
  Group: Ti
  Data: Secondarily modified polyamide-based multifunctional adsorbent for efficient removal of U(VI) from radioactive wastewater.
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  Data: <searchLink fieldCode="AR" term="%22Li%2C+Xu-Xin%22">Li, Xu-Xin</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Wang%2C+Ze-Yang%22">Wang, Ze-Yang</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zhang%2C+Feng%22">Zhang, Feng</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Wang%2C+Wei-Jia%22">Wang, Wei-Jia</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Huang%2C+Qing-Gang%22">Huang, Qing-Gang</searchLink><relatesTo>2</relatesTo> (AUTHOR)<i> huangqg@impcas.ac.cn</i><br /><searchLink fieldCode="AR" term="%22Yan%2C+Ze-Yi%22">Yan, Ze-Yi</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> yanzeyi@lzu.edu.cn</i>
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Radioanalytical+%26+Nuclear+Chemistry%22">Journal of Radioanalytical & Nuclear Chemistry</searchLink>. May2026, Vol. 335 Issue 5, p3597-3610. 14p.
– Name: Subject
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  Data: *<searchLink fieldCode="DE" term="%22Adsorption+%28Chemistry%29%22">Adsorption (Chemistry)</searchLink><br />*<searchLink fieldCode="DE" term="%22Radioactive+waste+management%22">Radioactive waste management</searchLink><br />*<searchLink fieldCode="DE" term="%22Adsorption+kinetics%22">Adsorption kinetics</searchLink><br />*<searchLink fieldCode="DE" term="%22Langmuir+isotherms%22">Langmuir isotherms</searchLink><br />*<searchLink fieldCode="DE" term="%22Polymeric+sorbents%22">Polymeric sorbents</searchLink><br />*<searchLink fieldCode="DE" term="%22Wastewater+treatment%22">Wastewater treatment</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Adsorption has been widely acknowledged as a high-efficiency method for treating uranium-containing wastewater. In this work, a novel polyamide acid (PAA-AO) remodified by amidoxime was designed as uranium(VI) adsorbent, and successfully synthesized by grafting amidoxime (AO) onto a polyamide acid (PAA) backbone via cyanomethyl linkages. The resulting adsorbent containing substantial amide, carboxyl, and amidoxime groups, was utilized to address U(VI) contamination in environmental systems. The adsorption behavior of PAA-AO to U(VI) was fully investigated using batch experiments. The results showed that PAA-AO removed over 75% of U(VI) across the pH range of 4.0 to 7.0, with a maximum capacity of 370.4 mg/g at pH 6.0. The kinetic analysis indicated that the adsorption process conformed to the pseudo-second-order model, while isothermal data were best described by the Langmuir model. Thermodynamic studies confirmed that U(VI) adsorption onto PAA-AO was endothermic and spontaneous. PAA-AO adsorbent displayed the superior selectivity for U(VI) in the presence of competing metal ions. The mechanistic investigations via FT-IR and XPS demonstrated that C = O of carboxyl/malonamide and –NH2 (and/or –NH–) of amidoxime played the key roles in adsorption through strong coordination with U(VI). The proposal of cyanomethylation-secondary-modification provides an effective idea for the design of novel amidoxime-based adsorbent. [ABSTRACT FROM AUTHOR]
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RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1007/s10967-026-10889-x
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 14
        StartPage: 3597
    Subjects:
      – SubjectFull: Adsorption (Chemistry)
        Type: general
      – SubjectFull: Radioactive waste management
        Type: general
      – SubjectFull: Adsorption kinetics
        Type: general
      – SubjectFull: Langmuir isotherms
        Type: general
      – SubjectFull: Polymeric sorbents
        Type: general
      – SubjectFull: Wastewater treatment
        Type: general
    Titles:
      – TitleFull: Secondarily modified polyamide-based multifunctional adsorbent for efficient removal of U(VI) from radioactive wastewater.
        Type: main
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      – PersonEntity:
          Name:
            NameFull: Li, Xu-Xin
      – PersonEntity:
          Name:
            NameFull: Wang, Ze-Yang
      – PersonEntity:
          Name:
            NameFull: Zhang, Feng
      – PersonEntity:
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            NameFull: Wang, Wei-Jia
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          Name:
            NameFull: Huang, Qing-Gang
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            NameFull: Yan, Ze-Yi
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          Dates:
            – D: 01
              M: 05
              Text: May2026
              Type: published
              Y: 2026
          Identifiers:
            – Type: issn-print
              Value: 02365731
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            – Type: volume
              Value: 335
            – Type: issue
              Value: 5
          Titles:
            – TitleFull: Journal of Radioanalytical & Nuclear Chemistry
              Type: main
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