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具有增强的对Pb(II)和Cd(II)离子吸附能力的新型磁性可回收氨基功能化MIL-101(Fe)复合材料

Novel Magnetically Recoverable Amino-Functionalized MIL-101(Fe) Composite with Enhanced Adsorption Capacity for Pb(II) and Cd(II) Ions.

作者信息

Simonescu Claudia Maria, Culita Daniela C, Marinescu Gabriela, Atkinson Irina, Marinescu Virgil, Oprea Ovidiu, Stanica Nicolae

机构信息

Faculty of Chemical Engineering and Biotechnologies, National University of Science and Technology POLITEHNICA Bucharest, 313 Splaiul Independentei, 060042 Bucharest, Romania.

Ilie Murgulescu Institute of Physical Chemistry, 202 Splaiul Independentei, 060021 Bucharest, Romania.

出版信息

Molecules. 2025 Jul 7;30(13):2879. doi: 10.3390/molecules30132879.

DOI:10.3390/molecules30132879
PMID:40649392
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC12250647/
Abstract

In this study, we report the synthesis and characterization of a novel NH-MIL-101(Fe) magnetic composite, developed via in situ formation of NH-MIL-101(Fe) in the presence of FeO nanoparticles embedded within a chloropropyl-modified mesoporous silica layer. This hybrid composite retains the high adsorption capacity of NH-MIL-101(Fe) while benefiting from the easy magnetic separation enabled by FeO nanoparticles. The mesoporous silica forms a protective porous coating around the magnetic nanoparticles, significantly enhancing its chemical stability and preventing clumping. Beyond protection, the mesoporous silica layer provides a high-surface-area scaffold that promotes the uniform in situ growth of NH-MIL-101(Fe). Functionalization of the silica surface with chloride groups enables strong electrostatic interactions between the magnetic component and metal organic framework (MOF), ensuring a homogeneous and stable hybrid structure. The new composite's capacity to remove Pb(II) and Cd(II) ions from aqueous solutions was systematically investigated. The adsorption data showed a good fit with the Langmuir isotherm model for both ions, the maximum adsorption capacities calculated being 214.6 mg g for Pb(II) and 181.6 mg g Cd(II). Furthermore, the kinetic behavior of the adsorption process was accurately described by the pseudo-second-order model. These findings confirm the effectiveness of this composite for the removal of Pb(II) and Cd(II) ions from aqueous solutions, demonstrating its potential as an efficient material for environmental remediation. The combination of magnetic recovery, high adsorption capacity, and stability makes this novel composite a promising candidate for heavy metal removal applications in water treatment processes.

摘要

在本研究中，我们报告了一种新型NH-MIL-101(Fe)磁性复合材料的合成与表征，该复合材料是通过在嵌入氯丙基改性介孔二氧化硅层内的FeO纳米颗粒存在下原位形成NH-MIL-101(Fe)而制备的。这种杂化复合材料保留了NH-MIL-101(Fe)的高吸附容量，同时受益于FeO纳米颗粒实现的易于磁分离。介孔二氧化硅在磁性纳米颗粒周围形成保护性多孔涂层，显著提高其化学稳定性并防止团聚。除了保护作用外，介孔二氧化硅层还提供了一个高比表面积的支架，促进了NH-MIL-101(Fe)的均匀原位生长。用氯基团对二氧化硅表面进行功能化，使得磁性组分与金属有机框架（MOF）之间能够产生强静电相互作用，确保了均匀且稳定的杂化结构。系统研究了这种新型复合材料从水溶液中去除Pb(II)和Cd(II)离子的能力。吸附数据表明，这两种离子均与朗缪尔等温线模型拟合良好，计算得出的Pb(II)和Cd(II)的最大吸附容量分别为214.6 mg/g和181.6 mg/g。此外，吸附过程的动力学行为可用准二级模型准确描述。这些发现证实了这种复合材料用于从水溶液中去除Pb(II)和Cd(II)离子的有效性，证明了其作为环境修复高效材料的潜力。磁回收、高吸附容量和稳定性的结合，使这种新型复合材料成为水处理过程中重金属去除应用的有前途的候选材料。

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