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<p>Uranium contamination in water bodies poses serious environmental and health risks, necessitating the development of efficient and recyclable adsorbents. In this study, a novel magnetic biosorbent, GS@Fe<sub>3</sub>O₄, was synthesized via a green MOF-pyrolysis route, in which an iron-based metal–organic framework (Fe-MOF) grown on&#xa0;<i>Galdieria sulphuraria</i>&#xa0;(GS) was partially converted into a porous Fe<sub>3</sub>O₄ coating. The resulting composite exhibited excellent uranium adsorption performance, with a maximum capacity of 756.06&#xa0;mg·g⁻<sup>1</sup> at pH 6 and 25&#xa0;°C. The adsorption process followed the Langmuir isotherm (R<sup>2</sup> = 0.988) and pseudo‑second‑order kinetic models (R<sup>2</sup> = 0.984), suggesting monolayer chemisorption. Thermodynamic analysis confirmed the spontaneous and endothermic nature of adsorption (ΔG &lt; 0, ΔH =  + 65&#xa0;kJ·mol⁻<sup>1</sup>). The adsorption mechanism primarily involved coordination between U(VI) and Fe–O groups, along with complexation with phosphorus-containing functional groups derived from the algal biomass. The material also demonstrated convenient magnetic separability, good selectivity in the presence of competing ions, and maintained over 80% adsorption efficiency after three regeneration cycles. This work provides a feasible and sustainable strategy for the recovery of uranium from complex aqueous environments.</p>

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Green Synthesis of Magnetic Algae Supported Fe3O4 via MOF Pyrolysis for Efficient UO₂(NO₃)₂ Adsorption

  • 期刊论文

  • 发表日期：

    2026年4月28日

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  • Shiji Lin,
  • Yuantao Chen,
  • Wei Zhang,
  • Chaoli Shao,
  • Haibo Mao,
  • Xiaohang Zhou

摘要

Uranium contamination in water bodies poses serious environmental and health risks, necessitating the development of efficient and recyclable adsorbents. In this study, a novel magnetic biosorbent, GS@Fe3O₄, was synthesized via a green MOF-pyrolysis route, in which an iron-based metal–organic framework (Fe-MOF) grown on Galdieria sulphuraria (GS) was partially converted into a porous Fe3O₄ coating. The resulting composite exhibited excellent uranium adsorption performance, with a maximum capacity of 756.06 mg·g⁻1 at pH 6 and 25 °C. The adsorption process followed the Langmuir isotherm (R2 = 0.988) and pseudo‑second‑order kinetic models (R2 = 0.984), suggesting monolayer chemisorption. Thermodynamic analysis confirmed the spontaneous and endothermic nature of adsorption (ΔG < 0, ΔH =  + 65 kJ·mol⁻1). The adsorption mechanism primarily involved coordination between U(VI) and Fe–O groups, along with complexation with phosphorus-containing functional groups derived from the algal biomass. The material also demonstrated convenient magnetic separability, good selectivity in the presence of competing ions, and maintained over 80% adsorption efficiency after three regeneration cycles. This work provides a feasible and sustainable strategy for the recovery of uranium from complex aqueous environments.