Zhang Jian, Gao Yue, Hou Jinjin, Guo Jing, Shao Zhaoshuai, Ming Yuanhang, He Lifang, Chen Qian, Wang Suhua, Zhang Kui, Zhang Zhongping
School of Chemistry and Chemical Engineering, Anhui University of Technology, Ma'anshan, Anhui 243032, China.
College of Environmental Science and Engineering, Guangdong University of Petrochemical Technology, Maoming, Guangdong 525000, China.
J Hazard Mater. 2024 Mar 5;465:133286. doi: 10.1016/j.jhazmat.2023.133286. Epub 2023 Dec 18.
An ideal adsorbent material that combines the multiple capabilities of sensitive detection, efficient adsorption, and repeatable removal of uranium (U) from the environment remains a serious challenge. Herin, a general method was developed for synthesizing a series of phosphate anions (such as: PO, PO, PO and PO) modified magnetic mesoporous silica nanoparticles (FeO @mSiO-Zn NPs). The mesoporous surfaces and abundant phosphate groups provide potential, powerful uranium-binding sites for capturing U(VI) ions. Especially, the optimum adsorption capacity of FeO @mSiO-Zn/PO NPs was as high as 885.90 mg·g (298 K), which was higher than that of unmodified or other phosphate anions-modified FeO @mSiO-Zn NPs. Meanwhile, PO-binding sites and mesoporous surfaces also strongly restrict U(VI) ions' fluorescence vibrational inactivation, the adsorption results in rapid green fluorescence enhancement (within 180 s), and an ultra-low detection limit (4.5 nmol·L), which is well below the standard in drinking water of the World Health Organization (WHO). Furthermore, even after 5 cycles, the adsorbent still maintained their original adsorption capacity of 80.21% and displayed excellent selectivity for detecting and removing U(VI) from seawater. Based on these results, the FeO @mSiO-Zn/PO NPs seem to be a suitable multifunctional adsorbent for the detection, adsorption, and removal of U(VI) from environment.
一种能够结合灵敏检测、高效吸附以及可重复去除环境中铀（U）的多种功能的理想吸附材料，仍然是一项严峻挑战。在此，开发了一种通用方法来合成一系列磷酸根阴离子（如：PO₄³⁻、HPO₄²⁻、H₂PO₄⁻和PO₂F²⁻）修饰的磁性介孔二氧化硅纳米颗粒（Fe₃O₄@mSiO₂-Zn NPs）。介孔表面和丰富的磷酸基团为捕获U(VI)离子提供了潜在的、强大的铀结合位点。特别是，Fe₃O₄@mSiO₂-Zn/PO₄³⁻ NPs的最佳吸附容量高达885.90 mg·g⁻¹（298 K），高于未修饰或其他磷酸根阴离子修饰的Fe₃O₄@mSiO₂-Zn NPs。同时，PO₄³⁻结合位点和介孔表面也强烈限制U(VI)离子的荧光振动失活，吸附导致绿色荧光快速增强（在180 s内），且检测限超低（4.5 nmol·L⁻¹），远低于世界卫生组织（WHO）饮用水标准。此外，即使经过5个循环，该吸附剂仍保持其原始吸附容量的80.21%，并对从海水中检测和去除U(VI)表现出优异的选择性。基于这些结果，Fe₃O₄@mSiO₂-Zn/PO₄³⁻ NPs似乎是一种适用于从环境中检测、吸附和去除U(VI)的多功能吸附剂。
