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Engineering fast sodium-ion transport channels in a NASICON phosphate for targeted U(VI) removal from radioactive wastewater.

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Title: Engineering fast sodium-ion transport channels in a NASICON phosphate for targeted U(VI) removal from radioactive wastewater.
Authors: Wu, Jinyu1 (AUTHOR), Yang, Libo1 (AUTHOR), Feng, Aiguo1 (AUTHOR), Chen, Bihong1 (AUTHOR), Sun, Wenhan1 (AUTHOR) swh@gxu.edu.cn, Wang, Xinpeng1,2 (AUTHOR) wangxinpeng@gxu.edu.cn
Source: Separation & Purification Technology. Jul2026:Part 2, Vol. 395, pN.PAG-N.PAG. 1p.
Subjects: Ion exchange (Chemistry), Wastewater treatment, Ion mobility, Adsorption kinetics, Density functional theory, Phosphate minerals, Radioactive wastes, Environmental remediation
Abstract: The advancement of nuclear energy inevitably generates substantial volumes of radioactive uranium-containing wastewater. Therefore, developing materials capable of efficiently capturing uranium from wastewater is imperative for environmental remediation and the secondary utilization of uranium resources. In this study, a NASICON-type phosphate adsorbent, Na 4 MnAl(PO 4) 3 (NMAP), featuring an R -32 space group structure, was synthesized via a sol–gel method coupled with high-temperature solid-state sintering. Its unique spatial configuration effectively broadens ion transport channels and establishes rapid Na+ diffusion pathways essential for uranium adsorption. Experimental results demonstrate that NMAP exhibits superior selectivity and high efficiency in uranium removal. At pH 3.0, NMAP exhibited rapid adsorption kinetics (reaching equilibrium within approximately 120 min) and a remarkable maximum adsorption capacity of 670.19 mg/g. Furthermore, density functional theory (DFT) calculations explicitly reveal that the framework phosphate groups and sodium vacancies provide highly favorable binding sites for uranyl ions, perfectly corroborating the multi-spectroscopic findings. Moreover, the material maintained exceptional selectivity (K d > 105 mL/g) even in the presence of complex water matrices (e.g., industrial wastewater and lake water) and high concentrations of competing ions, while retaining robust stability and reusability over five consecutive adsorption–desorption cycles. Detailed characterization elucidated the important roles of ion exchange, surface redox reactions mediated by Mn species, coordination with P O and M–O groups, and electrostatic attraction in the uranium adsorption process. Owing to its facile synthesis, rapid kinetics, high selectivity, and strong environmental adaptability, NMAP presents a promising and cost-effective solution for the advanced treatment of radioactive uranium-containing wastewater and the recovery of uranium resources. [Display omitted] • Na 4 MnAl(PO 4) 3 with R 32 space group and abundant Na sites was synthesized. • Maximum U(VI) adsorption capacity reached 670.19 mg/g at pH 3.0. • Superior selectivity (K d > 105 mL/g) was achieved in complex water matrices. • Mechanism involved ion exchange, coordination, and Mn-mediated redox. [ABSTRACT FROM AUTHOR]
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: 193198878
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  Data: Engineering fast sodium-ion transport channels in a NASICON phosphate for targeted U(VI) removal from radioactive wastewater.
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  Data: <searchLink fieldCode="AR" term="%22Wu%2C+Jinyu%22">Wu, Jinyu</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Yang%2C+Libo%22">Yang, Libo</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Feng%2C+Aiguo%22">Feng, Aiguo</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Chen%2C+Bihong%22">Chen, Bihong</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Sun%2C+Wenhan%22">Sun, Wenhan</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> swh@gxu.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Wang%2C+Xinpeng%22">Wang, Xinpeng</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> wangxinpeng@gxu.edu.cn</i>
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  Data: <searchLink fieldCode="JN" term="%22Separation+%26+Purification+Technology%22">Separation & Purification Technology</searchLink>. Jul2026:Part 2, Vol. 395, pN.PAG-N.PAG. 1p.
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  Data: <searchLink fieldCode="DE" term="%22Ion+exchange+%28Chemistry%29%22">Ion exchange (Chemistry)</searchLink><br /><searchLink fieldCode="DE" term="%22Wastewater+treatment%22">Wastewater treatment</searchLink><br /><searchLink fieldCode="DE" term="%22Ion+mobility%22">Ion mobility</searchLink><br /><searchLink fieldCode="DE" term="%22Adsorption+kinetics%22">Adsorption kinetics</searchLink><br /><searchLink fieldCode="DE" term="%22Density+functional+theory%22">Density functional theory</searchLink><br /><searchLink fieldCode="DE" term="%22Phosphate+minerals%22">Phosphate minerals</searchLink><br /><searchLink fieldCode="DE" term="%22Radioactive+wastes%22">Radioactive wastes</searchLink><br /><searchLink fieldCode="DE" term="%22Environmental+remediation%22">Environmental remediation</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: The advancement of nuclear energy inevitably generates substantial volumes of radioactive uranium-containing wastewater. Therefore, developing materials capable of efficiently capturing uranium from wastewater is imperative for environmental remediation and the secondary utilization of uranium resources. In this study, a NASICON-type phosphate adsorbent, Na 4 MnAl(PO 4) 3 (NMAP), featuring an R -32 space group structure, was synthesized via a sol–gel method coupled with high-temperature solid-state sintering. Its unique spatial configuration effectively broadens ion transport channels and establishes rapid Na+ diffusion pathways essential for uranium adsorption. Experimental results demonstrate that NMAP exhibits superior selectivity and high efficiency in uranium removal. At pH 3.0, NMAP exhibited rapid adsorption kinetics (reaching equilibrium within approximately 120 min) and a remarkable maximum adsorption capacity of 670.19 mg/g. Furthermore, density functional theory (DFT) calculations explicitly reveal that the framework phosphate groups and sodium vacancies provide highly favorable binding sites for uranyl ions, perfectly corroborating the multi-spectroscopic findings. Moreover, the material maintained exceptional selectivity (K d > 105 mL/g) even in the presence of complex water matrices (e.g., industrial wastewater and lake water) and high concentrations of competing ions, while retaining robust stability and reusability over five consecutive adsorption–desorption cycles. Detailed characterization elucidated the important roles of ion exchange, surface redox reactions mediated by Mn species, coordination with P O and M–O groups, and electrostatic attraction in the uranium adsorption process. Owing to its facile synthesis, rapid kinetics, high selectivity, and strong environmental adaptability, NMAP presents a promising and cost-effective solution for the advanced treatment of radioactive uranium-containing wastewater and the recovery of uranium resources. [Display omitted] • Na 4 MnAl(PO 4) 3 with R 32 space group and abundant Na sites was synthesized. • Maximum U(VI) adsorption capacity reached 670.19 mg/g at pH 3.0. • Superior selectivity (K d > 105 mL/g) was achieved in complex water matrices. • Mechanism involved ion exchange, coordination, and Mn-mediated redox. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>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.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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    Identifiers:
      – Type: doi
        Value: 10.1016/j.seppur.2026.137781
    Languages:
      – Code: eng
        Text: English
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      Pagination:
        PageCount: 1
        StartPage: N.PAG
    Subjects:
      – SubjectFull: Ion exchange (Chemistry)
        Type: general
      – SubjectFull: Wastewater treatment
        Type: general
      – SubjectFull: Ion mobility
        Type: general
      – SubjectFull: Adsorption kinetics
        Type: general
      – SubjectFull: Density functional theory
        Type: general
      – SubjectFull: Phosphate minerals
        Type: general
      – SubjectFull: Radioactive wastes
        Type: general
      – SubjectFull: Environmental remediation
        Type: general
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      – TitleFull: Engineering fast sodium-ion transport channels in a NASICON phosphate for targeted U(VI) removal from radioactive wastewater.
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            NameFull: Wu, Jinyu
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            NameFull: Yang, Libo
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            NameFull: Feng, Aiguo
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            NameFull: Chen, Bihong
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            NameFull: Sun, Wenhan
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            – D: 20
              M: 07
              Text: Jul2026:Part 2
              Type: published
              Y: 2026
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              Value: 395
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