Study on the adsorption performance of toluene by bimetallic doped MOFs with high adsorption capacity

IF 4 2区化学 Q2 CHEMISTRY, PHYSICAL Journal of Molecular Structure Pub Date : 2024-11-26 DOI:10.1016/j.molstruc.2024.140912

Yunxia Li, Jiawei Cao, Qingqing Liu, Xinru Hu, Yongqiang Wang, Fang Liu

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Abstract

In this study, Cr-MIL-101-M doped with metal ions (Ce³⁺, Fe³⁺, Al³⁺) was synthesized by hydrothermal method for toluene adsorption. The physical and chemical properties of the adsorbent were studied by XRD, SEM, EDS, BET, CO₂-TPD, TG and other characterization methods. The results show that doping metal ions can effectively improve the toluene adsorption capacity of Cr-MIL-101, with aluminum being the optimal doping metal and the best doping ratio being 20%. Under these conditions, Cr-MIL-101- 20% Al has more basic adsorption sites, a larger specific surface area (3106.37 m²/g) and pore volume (1.85 cm³/g), which provides more active sites for toluene adsorption. Therefore, Cr-MIL-101-20%Al possesses the highest saturation adsorption capacity (486.05 mg/g). Kinetic analysis indicated that both physical and chemical adsorption significantly contributed to the uptake of toluene by bimetallic MOFs, and the doping of 20% Al markedly enhanced the adsorption rate, achieving the optimal adsorption effect.

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高吸附量双金属掺杂mof对甲苯吸附性能的研究

本研究采用水热法合成了掺杂金属离子（Ce3+, Fe3+, Al3+）的Cr-MIL-101-M，用于吸附甲苯。采用XRD、SEM、EDS、BET、CO2-TPD、TG等表征方法对吸附剂的理化性质进行了研究。结果表明，掺杂金属离子能有效提高Cr-MIL-101对甲苯的吸附能力，其中铝为最佳掺杂金属，掺杂比例为20%。在此条件下，Cr-MIL-101- 20% Al具有更多的碱性吸附位点，更大的比表面积（3106.37 m²/g）和孔隙体积（1.85 cm³/g），为甲苯吸附提供了更多的活性位点。因此Cr-MIL-101-20%Al具有最高的饱和吸附容量（486.05 mg/g）。动力学分析表明，物理吸附和化学吸附对双金属mof对甲苯的吸附都有显著的促进作用，其中20% Al的掺杂显著提高了吸附速率，达到了最佳的吸附效果。

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来源期刊

Journal of Molecular Structure 化学-物理化学

CiteScore

7.10

自引率

15.80%

发文量

2384

审稿时长

45 days

期刊介绍： The Journal of Molecular Structure is dedicated to the publication of full-length articles and review papers, providing important new structural information on all types of chemical species including: • Stable and unstable molecules in all types of environments (vapour, molecular beam, liquid, solution, liquid crystal, solid state, matrix-isolated, surface-absorbed etc.) • Chemical intermediates • Molecules in excited states • Biological molecules • Polymers. The methods used may include any combination of spectroscopic and non-spectroscopic techniques, for example: • Infrared spectroscopy (mid, far, near) • Raman spectroscopy and non-linear Raman methods (CARS, etc.) • Electronic absorption spectroscopy • Optical rotatory dispersion and circular dichroism • Fluorescence and phosphorescence techniques • Electron spectroscopies (PES, XPS), EXAFS, etc. • Microwave spectroscopy • Electron diffraction • NMR and ESR spectroscopies • Mössbauer spectroscopy • X-ray crystallography • Charge Density Analyses • Computational Studies (supplementing experimental methods) We encourage publications combining theoretical and experimental approaches. The structural insights gained by the studies should be correlated with the properties, activity and/ or reactivity of the molecule under investigation and the relevance of this molecule and its implications should be discussed.