Preparation of magnetic Fe3O4 composite Cu-MOFs and their removal of perrhenate ions

IF 3.2 3区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR

Journal of Solid State Chemistry Pub Date : 2025-04-22 DOI:10.1016/j.jssc.2025.125390

Xiane Chong, Wenli Bao, Yanrui Wang, Zhonghua Sun, Le Chen, Qun Chen, Zhihui Zhang

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Abstract

The removal of toxic pollutants from wastewater, especially radioactive contaminants, has attracted the attention of scientists worldwide. Pertechnetate TcO₄⁻, as an oxyanion with a high oxidation state of technetium, is one of the harmful radionuclides due to its high mobility in the environment. The removal of TcO₄⁻ or its non-radioactive substitute, ReO₄⁻, is becoming significant. MOFs represent a class of excellent adsorbents for water remediation due to their large specific surface area, tunable pore structure, phase purity, and thermal stability. A copper-based Metal-Organic Framework (MOF) was synthesized by hydrothermal methods and modified with nano-Fe₃O₄ particles. Through a series of adsorption experiments, the factors influencing the removal rate of ReO₄⁻ were investigated, including pH values, the initial concentration of the adsorbate, and the adsorbent dosages. Under photodegradation conditions, the removal rate of ReO₄⁻ reached 85 % over the pristine Cu-MOF adsorbent and increased to 97 % over the modified Cu-MOF@Fe₃O₄ composite material. Introducing magnetic moieties enabled the composites to recover efficiently with external magnets.

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磁性Fe3O4复合Cu-MOFs的制备及其对高透酸盐离子的去除

从废水中去除有毒污染物，特别是放射性污染物，已经引起了全世界科学家的关注。高锝酸盐TcO4−作为一种高氧化态的氧阴离子，由于其在环境中的高迁移率，是一种有害的放射性核素。TcO4−或其非放射性替代品ReO4−的去除变得越来越重要。mof具有比表面积大、孔结构可调、相纯度高、热稳定性好等优点，是一种非常好的水修复吸附剂。采用水热法合成了一种铜基金属有机骨架（MOF），并对其进行了纳米fe3o4修饰。通过一系列吸附实验，考察了pH值、吸附剂初始浓度和吸附剂投加量对ReO4−去除率的影响。在光降解条件下，与原始Cu-MOF吸附剂相比，ReO4−的去除率达到85%，与改性Cu-MOF@Fe3O4复合材料相比，ReO4−的去除率提高到97%。引入磁性部分使复合材料能够有效地与外部磁铁回收。

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来源期刊

Journal of Solid State Chemistry 化学-无机化学与核化学

CiteScore

6.00

自引率

9.10%

发文量

848

审稿时长

25 days

期刊介绍： Covering major developments in the field of solid state chemistry and related areas such as ceramics and amorphous materials, the Journal of Solid State Chemistry features studies of chemical, structural, thermodynamic, electronic, magnetic, and optical properties and processes in solids.