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【NH2-MIL-101】MOFs for removal of heavy metal ions
Summary:
The authors from Nankai University developed a series of amino-functionalized metal-organic frameworks (MOFs) with excellent fluorescence and adsorption properties, achieving significant results in the detection and removal of heavy metal ions.
Background:
1. Heavy metal pollution poses a severe threat to the environment and human health. Previous researchers have explored various methods for detecting and removing heavy metals, achieving some success. However, most methods can only perform either detection or removal, limiting their practical applications.
2. The authors proposed an innovative universal sensing platform based on amino-functionalized MOFs, which can both detect and remove heavy metal ions efficiently.
Research Content:
1. Synthesis:
The authors synthesized several amino-functionalized MOFs, including MIL-101-NH2, UiO-66-NH2, MOF-5-NH2, and MIL-53-NH2, using a solvothermal method.
2. Characterizations:
1) BET surface area analysis showed that MIL-101-NH2 had a surface area of 454.6 m²/g, reduced from 587.4 m²/g due to the introduction of amino groups.
2) SEM/TEM tests revealed that MIL-101-NH2 exhibited spindle-shaped crystals with particle sizes around 200 nm.
3) Fluorescence tests indicated that MIL-101-NH2 showed strong fluorescence emission at 427 nm under excitation at 332 nm.
3. Application:
The amino-functionalized MOFs demonstrated excellent performance in detecting Fe³⁺, Cu²⁺, and Pb²⁺ with low detection limits (0.0018 mM for Fe³⁺, 0.0016 mM for Cu²⁺, and 0.0052 mM for Pb²⁺). Additionally, MIL-101-NH2 exhibited high adsorption capacities for these ions (3.5 mM/g for Fe³⁺, 0.9 mM/g for Cu²⁺, and 1.1 mM/g for Pb²⁺).
4. Mechanism:
The fluorescence quenching and adsorption mechanisms were attributed to the chelation between the amino groups of the MOFs and the metal ions, as confirmed by XPS and FT-IR analyses.
Outlook:
This research provides a universal and efficient platform for detecting and removing heavy metal ions using amino-functionalized MOFs. The findings open new possibilities for environmental protection through surface modification of MOFs.
A novel and universal metal-organic frameworks sensing platform for selective detection and efficient removal of heavy metal ions
Authors: Shi-Wen Lv, Jing-Min Liu, Chun-Yang Li, Ning Zhao, Zhi-Hao Wang, Shuo Wang
DOI: 10.1016/j.cej.2019.122111
Link: https://www.sciencedirect.com/science/article/pii/S1385894719315050
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