Kinetic adsorption mechanism of cobalt(II) ions and Congo red on pristine and Schiff base-surface-modified MIL-101(Fe)-NH2

IF 4.7 3区材料科学 Q1 CHEMISTRY, APPLIED Microporous and Mesoporous Materials Pub Date : 2025-03-15 Epub Date: 2025-01-09 DOI:10.1016/j.micromeso.2025.113493

Ľuboš Zauška , Paula Pillárová , Dominik Volavka , Eva Kinnertová , Jozef Bednarčík , Jiří Brus , Virginie Hornebecq , Miroslav Almáši

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Abstract

This study investigates the adsorption kinetics of heavy metal ions (Co(II)) and azo dye (Congo red) using surface-modified MIL-101(Fe)-NH₂. The material's large surface area and dual pore structure enhance adsorption performance, making it suitable for environmental applications. The MIL-101(Fe)-NH₂ material was synthesized and further modified with 2-pyridinecarboxaldehyde to create MIL-101(Fe)-Pyr with the aim of enhancing the adsorption properties. Characterization techniques, including FTIR, TG/DTA, ss-NMR, XPS, N₂ adsorption/desorption measurements, and PXRD, confirmed the structural integrity and functionalization of the materials. Kinetic studies revealed that MIL-101(Fe)-Pyr demonstrated superior adsorption capacity and faster kinetics for Co(II) ions compared to pristine MIL-101(Fe)-NH₂. The adsorption mechanisms were analyzed using pseudo-first-order, pseudo-second-order, and Elovich models. The pseudo-second-order model provided the best fit for both Co(II) and Congo red adsorption. Boyd's diffusion model indicated that external diffusion is a significant rate-controlling step. The adsorption isotherms were fitted with the Freudlich and Langmuir models, and the thermodynamics of the adsorption processes were also studied. The adsorption mechanism of the selected pollutants was proposed, and the stability and reusability of the materials were investigated. The study concludes that surface modifications enhance the material's adsorption properties, making MIL-101(Fe)-Pyr a promising adsorbent for removing pollutants from aqueous environments.

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原始和希夫碱表面改性MIL-101(Fe)-NH2对钴（II）离子和刚果红的动力学吸附机理

研究了表面改性MIL-101(Fe)-NH2对重金属离子（Co(II)）和偶氮染料（刚果红）的吸附动力学。该材料的大表面积和双孔结构增强了吸附性能，使其适合于环境应用。合成了MIL-101(Fe)-NH2材料，并用2-吡啶甲酸对其进行改性，制备了MIL-101(Fe)-Pyr，以提高其吸附性能。表征技术，包括FTIR， TG/DTA, ss-NMR， XPS， N2吸附/解吸测量和PXRD，证实了材料的结构完整性和功能化。动力学研究表明，与原始MIL-101(Fe)-NH2相比，MIL-101(Fe)-Pyr具有更好的吸附能力和更快的Co（II）离子动力学。采用拟一阶、拟二阶和Elovich模型分析了吸附机理。拟二阶模型对Co（II）和刚果红的吸附均具有较好的拟合性。Boyd的扩散模型表明，外扩散是一个重要的速率控制步骤。采用Freudlich和Langmuir模型拟合了吸附等温线，并对吸附过程的热力学进行了研究。提出了所选污染物的吸附机理，并对材料的稳定性和可重复使用性进行了研究。该研究得出结论，表面改性增强了材料的吸附性能，使MIL-101(Fe)-Pyr成为一种有前途的吸附剂，用于去除水中环境中的污染物。

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来源期刊

Microporous and Mesoporous Materials 化学-材料科学：综合

CiteScore

10.70

自引率

5.80%

发文量

649

审稿时长

26 days

期刊介绍： Microporous and Mesoporous Materials covers novel and significant aspects of porous solids classified as either microporous (pore size up to 2 nm) or mesoporous (pore size 2 to 50 nm). The porosity should have a specific impact on the material properties or application. Typical examples are zeolites and zeolite-like materials, pillared materials, clathrasils and clathrates, carbon molecular sieves, ordered mesoporous materials, organic/inorganic porous hybrid materials, or porous metal oxides. Both natural and synthetic porous materials are within the scope of the journal. Topics which are particularly of interest include: All aspects of natural microporous and mesoporous solids The synthesis of crystalline or amorphous porous materials The physico-chemical characterization of microporous and mesoporous solids, especially spectroscopic and microscopic The modification of microporous and mesoporous solids, for example by ion exchange or solid-state reactions All topics related to diffusion of mobile species in the pores of microporous and mesoporous materials Adsorption (and other separation techniques) using microporous or mesoporous adsorbents Catalysis by microporous and mesoporous materials Host/guest interactions Theoretical chemistry and modelling of host/guest interactions All topics related to the application of microporous and mesoporous materials in industrial catalysis, separation technology, environmental protection, electrochemistry, membranes, sensors, optical devices, etc.