γ辐照制备强效吡唑酸盐基金属有机骨架，用于铀的高效吸附

IF 2.8 3区物理与天体物理 Q3 CHEMISTRY, PHYSICAL

Radiation Physics and Chemistry Pub Date : 2025-05-08 DOI:10.1016/j.radphyschem.2025.112915

Jinfeng Li , Nan Zhang , Qianwen Wang , Jianwei Zhang , Bo Tian , Zhigang Li , Haifeng Gu , Hongtao Zhao

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引用次数: 0

摘要

从核废料中高效去除铀的研究对放射性核素修复和环境保护具有重要意义。以1,3,5-三（1h -吡唑醇-4-基）苯（H3BTP）与镍（II）为络合物，采用γ辐照制备了一种坚固的吡唑酸盐基金属有机骨架（NiBTP），并具有高效的U（VI）吸附性能。采用XRD、FTIR、SEM、TEM、XPS和N2吸附/脱附等温线对合成的NiBTP进行了表征。结构表征表明，经γ-辐照制备的NiBTP具有比表面积减小、孔隙结构分层、结晶度好、化学稳定性高等特点。批量实验表明，NiBTP吸附剂在K+、Cs+、Sr+、Co2+、Mg2+、Ca2+、La3+和Eu3+离子竞争存在下，对铀具有较高的吸附能力，对UO22+离子具有良好的选择性。热力学研究表明，吸附过程是吸热自发的。此外，UO22+离子在NiBTP上的吸附机理与层次化孔结构和络合作用有关。本研究提出了一种更简单、更有效的制备吡唑酸mof的替代方法，并强调了吡唑酸mof在水环境中吸收放射性污染物方面的强大作用。

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The preparation of a robust pyrazolate-based metal-organic framework by γ-irradiation for efficient uranium adsorption

The research for highly removal of uranium from nuclear waste is of significance for radionuclide remediation and environment. Herein, a robust pyrazolate-based metal-organic framework (NiBTP) is prepared by γ-irradiation through complexation between 1,3,5-tris(1H-pyrazol-4-yl) benzene (H₃BTP) and Nickel (II) and presents efficient U(VI) adsorption performance. The synthesized NiBTP is characterized by XRD, FTIR, SEM, TEM, XPS and N₂ adsorption/desorption isotherm analysis. Structural characterizations demonstrate that NiBTP prepared by γ-irradiation possesses decreased BET surface area with hierarchical pore structure, but also has excellent crystallinity and high chemical stability. Batch experiments reveal that NiBTP adsorbent displays high adsorption capacity of uranium and excellent selectivity for UO₂²⁺ ion in the presence of competing K⁺, Cs⁺, Sr⁺, Co²⁺, Mg²⁺, Ca²⁺, La³⁺ and Eu³⁺ ions. Thermodynamic investigation shows the adsorption process is endothermic and spontaneous. In addition, the adsorption mechanism of UO₂²⁺ ion onto NiBTP is attributed to the hierarchical pore architecture as well as complexation. This study presents a simpler and more efficient alternative method for the preparation of pyrazolate MOFs and highlights the power of robust pyrazolate MOFs in sequestrations of radioactive pollutants from water environment.

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来源期刊

Radiation Physics and Chemistry 化学-核科学技术

CiteScore

5.60

自引率

17.20%

发文量

574

审稿时长

12 weeks

期刊介绍： Radiation Physics and Chemistry is a multidisciplinary journal that provides a medium for publication of substantial and original papers, reviews, and short communications which focus on research and developments involving ionizing radiation in radiation physics, radiation chemistry and radiation processing. The journal aims to publish papers with significance to an international audience, containing substantial novelty and scientific impact. The Editors reserve the rights to reject, with or without external review, papers that do not meet these criteria. This could include papers that are very similar to previous publications, only with changed target substrates, employed materials, analyzed sites and experimental methods, report results without presenting new insights and/or hypothesis testing, or do not focus on the radiation effects.