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Nitrogen-Doped Calcite Derived from Ca-MOFs as an Efficient Adsorbent for Sr(II) Removal from Water: The Role of Nitrogen and Calcium

Author

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  • Xinran Xie

    (Laboratory of Environmental Technology, INET, Tsinghua University, Beijing 100084, China
    Joint Research Centre for Protective Infrastructure Technology and Environmental Green Bioprocess, School of Environmental and Municipal Engineering, Tianjin Chengjian University, Tianjin 300384, China)

  • Guoce Yu

    (Laboratory of Environmental Technology, INET, Tsinghua University, Beijing 100084, China)

  • Jiangbo Huo

    (Joint Research Centre for Protective Infrastructure Technology and Environmental Green Bioprocess, School of Environmental and Municipal Engineering, Tianjin Chengjian University, Tianjin 300384, China
    Tianjin Key Laboratory of Aquatic Science and Technology, Tianjin Chengjian University, Jinjing Road 26, Tianjin 300384, China)

  • Xinbo Zhang

    (Joint Research Centre for Protective Infrastructure Technology and Environmental Green Bioprocess, School of Environmental and Municipal Engineering, Tianjin Chengjian University, Tianjin 300384, China
    Tianjin Key Laboratory of Aquatic Science and Technology, Tianjin Chengjian University, Jinjing Road 26, Tianjin 300384, China)

  • Qing Du

    (Joint Research Centre for Protective Infrastructure Technology and Environmental Green Bioprocess, School of Environmental and Municipal Engineering, Tianjin Chengjian University, Tianjin 300384, China
    Tianjin Key Laboratory of Aquatic Science and Technology, Tianjin Chengjian University, Jinjing Road 26, Tianjin 300384, China)

Abstract

Strontium ( 90 Sr) is a typical radionuclide, which can act as a contaminant and poses a big problem for the eco-environment if left untreated. In this study, an original nitrogen-doped calcite (N-CaCO 3 ) was synthesized using a solvothermal and calcination method and used to remove Sr(II) from simulated water. XRD, SEM, and XPS analyses proved that N was successfully doped into CaCO 3 , resulting in porous CaCO 3 with a regular morphology. The specific surface area of N-CaCO 3 (136.53 m 2 /g) can reach 2.19-fold greater than that of CaCO 3 . The results based on the batch adsorption data indicated that the pseudo-second-order kinetic model (R 2 = 0.9964) and the ion exchange model (R 2 = 0.9859) fitted the adsorption data well. The as-synthesized N-CaCO 3 exhibited better adsorption performance in regard to low concentrations of Sr(II) (below 64.5 mg/L) compared with commercial CaCO 3 . The structural analysis suggested that Ca and N played pivotal roles in the adsorption process and that the adsorption mechanism was dominated by ion exchange and surface complexation. This study successfully fabricated a nitrogen-doped calcite for Sr(II) cleanup, presenting an efficient strategy to modulate the microstructure of CaCO 3 , or other materials, to enhance its adsorption performance.

Suggested Citation

  • Xinran Xie & Guoce Yu & Jiangbo Huo & Xinbo Zhang & Qing Du, 2024. "Nitrogen-Doped Calcite Derived from Ca-MOFs as an Efficient Adsorbent for Sr(II) Removal from Water: The Role of Nitrogen and Calcium," Clean Technol., MDPI, vol. 7(1), pages 1-18, December.
    • Handle: RePEc:gam:jcltec:v:7:y:2024:i:1:p:2-:d:1554425
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    References listed on IDEAS

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    1. Wang, Tingyu & Wang, Shuangfeng & Luo, Ruilian & Zhu, Chunyu & Akiyama, Tomohiro & Zhang, Zhengguo, 2016. "Microencapsulation of phase change materials with binary cores and calcium carbonate shell for thermal energy storage," Applied Energy, Elsevier, vol. 171(C), pages 113-119.
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