Home >
News > Effective Adsorption and Removal of Phosphate from Aqueous Solutions and Eutrophic Water by Fe-based MOFs of MIL-101
Effective Adsorption and Removal of Phosphate from Aqueous Solutions and Eutrophic Water by Fe-based MOFs of MIL-101
Summary:
The authors from Yunnan University developed Fe-based metal-organic frameworks (MOFs) MIL-101 and NH2-MIL-101 with high porosity and large surface area, achieving high efficiency in phosphate adsorption and removal from aqueous solutions and eutrophic water.
Background:
1. To address the problem of excessive phosphorus use leading to environmental issues like eutrophication, previous researchers have explored various strategies for phosphate removal, including enzymatic biodegradation, adsorption, electrochemistry, precipitation, and floatation. Among these, adsorption is widely employed due to its environmental safety, simplicity, and low cost. However, developing new adsorbents with high capacities remains a challenge.
2. The authors in this study proposed an innovative method of using Fe-based MOFs, which are cost-effective and environmentally friendly. They introduced amine functional groups to enhance phosphate adsorption and obtained promising results in terms of adsorption capacity and selectivity.
Research Content:
1. Synthesis:
The authors synthesized MIL-101(Fe) and NH2-MIL-101(Fe) using a general facile strategy involving thermal treatment of FeCl3·6H2O and terephthalic acid (H2BDC) or 2-aminoterephthalic acid (NH2-H2BDC) in DMF.
2. Characterizations:
1) BET results 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 volumes of 0.131 cm3·g−1 and 0.746 cm3·g−1, respectively.
2) SEM/TEM tests revealed loose and uniform polyhedron structures with average diameters of 2–3 μm and porous frames with hierarchical structures.
3) XPS spectra confirmed the presence of Fe-OH groups and successful bonding of Fe to oxygen atoms of the ligands.
3. Application:
The materials were tested for phosphate adsorption in aqueous solutions and real eutrophic water samples. Both MOFs showed high removal efficiencies, with NH2-MIL-101(Fe) achieving slightly better results. They also exhibited high selectivity towards phosphate over other anions and good recyclability.
4. Mechanism:
The analysis of experimental results and XPS spectra suggested that phosphate adsorption involved chemical interactions between phosphate ions and Fe sites, as well as possible electrostatic attraction with amine groups.
Outlook:
This research achieved significant progress in developing efficient and selective adsorbents for phosphate removal from eutrophic water bodies using Fe-based MOFs. The findings have important implications for environmental protection and water treatment.
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
The above review is for academic progress sharing. For any errors or copyright issues, please contact us for correction or removal.
