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[NH2-MIL-101] Effective Adsorption and Removal of Phosphate by Fe-MOF
Summary:
The authors from Yunnan University developed Fe-based metal-organic frameworks (MOFs) MIL-101(Fe) and NH2-MIL-101(Fe) with high adsorption capacities, achieving significant phosphate removal from aqueous solutions and eutrophic water.
Background:
1. Phosphate pollution from industrial and agricultural sources has led to severe eutrophication in water bodies, causing ecological issues. Previous researchers have explored various adsorbents, but many suffer from high costs or insufficient adsorption capacities.
2. The authors proposed using Fe-based MOFs with amine functional groups to enhance phosphate adsorption, achieving high efficiency and selectivity.
Research Content:
1. Synthesis:
The authors synthesized MIL-101(Fe) and NH2-MIL-101(Fe) using a solvothermal method with FeCl3·6H2O and terephthalic acid (H2BDC) or 2-aminoterephthalic acid (NH2-H2BDC).
2. Characterizations:
1) BET analysis showed surface areas of 2350.20 m²·g⁻¹ for MIL-101(Fe) and 2736.74 m²·g⁻¹ for NH2-MIL-101(Fe), with pore sizes of 3.37 nm and 1.88 nm, respectively.
2) SEM/TEM tests revealed polyhedron structures with average diameters of 2–3 μm.
3) XPS analysis confirmed the interaction between Fe sites and phosphate ions.
3. Application:
The Fe-based MOFs effectively removed phosphates from aqueous solutions, reducing concentrations from 0.60 mg·L⁻¹ to 0.045 mg·L⁻¹ (MIL-101(Fe)) and 0.032 mg·L⁻¹ (NH2-MIL-101(Fe)) within 30 minutes. They also showed high selectivity for phosphate over other anions and successfully treated real eutrophic water samples.
4. Mechanism:
The adsorption process followed pseudo-second-order kinetics, indicating chemisorption. The presence of amine groups in NH2-MIL-101(Fe) enhanced adsorption capacity through electrostatic interactions, while Fe sites in both MOFs played a key role in phosphate adsorption.
Outlook:
This research provides an effective and selective adsorbent for phosphate removal from eutrophic water bodies, highlighting the potential of Fe-based MOFs for environmental remediation.
Effective Adsorption and Removal of Phosphate from Aqueous Solutions and Eutrophic Water by Fe-based MOFs of MIL-101
Authors: Qiying Xie, Yan Li, Zhaoling Lv, Hang Zhou, Xiangjun Yang, Jing Chen, Hong Guo
DOI: 10.1038/s41598-017-03526-x
Link: https://www.nature.com/articles/s41598-017-03526-x
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