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Simultaneously efficient adsorption and photocatalytic degradation of tetracycline by Fe-based MOFs
Summary:
The authors from Hunan University developed a Fe-based metal-organic framework (MOF) material with excellent adsorption and photocatalytic degradation performance, achieving high removal efficiency of tetracycline in the field of environmental pollution control.
Background:
1. Tetracycline, as one of the most widely used antibiotics, poses significant environmental and health risks due to its extensive release into natural water bodies and wastewaters. Previous researchers have explored various methods such as adsorption, biological degradation, ion exchange, membrane filtration, and photocatalytic degradation to remove tetracycline. Among these, photocatalytic degradation has gained attention for its low cost, high efficiency, and no secondary pollution. However, there is still a need for more effective and sustainable materials to enhance the removal efficiency.
2. The authors in this study proposed the use of Fe-based MOFs, specifically Fe-MIL-101, Fe-MIL-100, and Fe-MIL-53, to address the limitations of existing materials. They synthesized these MOFs and investigated their performance in tetracycline removal, obtaining promising results.
Research Content:
1. Synthesis:
The authors synthesized Fe-MIL-101, Fe-MIL-100, and Fe-MIL-53 using the hydrothermal method. Fe-MIL-101 was prepared by dissolving FeCl3·6H2O and H2BDC in DMF, followed by sonication, heating in an autoclave, and purification. Fe-MIL-53 and Fe-MIL-100 were synthesized similarly with slight modifications in the procedures.
2. Characterizations:
1) BET analysis showed that Fe-MIL-101 had a surface area of 252.59 m²/g, pore volume of 0.86 cm³/g, and pore size of 25.74 nm, which were higher than those of Fe-MIL-100 and Fe-MIL-53.
2) SEM tests revealed that Fe-MIL-101 had a regular octahedral structure with a uniform size of about 500 nm. Fe-MIL-100 appeared as granules with sizes ranging from 500 nm to 1 μm, while Fe-MIL-53 resembled a bundle of wooden sticks with a diameter of about 80 μm.
3) UV-vis absorption spectra indicated that Fe-MIL-101 had the strongest visible light absorption ability among the three MOFs, with an absorption edge at about 660 nm, corresponding to a band gap of 1.88 eV.
3. Application:
The Fe-MILs were tested for their ability to remove tetracycline. Fe-MIL-101 exhibited the highest removal efficiency, with 96.6% of tetracycline removed at an initial concentration of 50 mg/L after 3 hours of visible light irradiation. The optimal dosage of Fe-MIL-101 was found to be 0.5 g/L. The material also showed good recyclability and stability after three cycles of adsorption and photocatalytic degradation.
4. Mechanism:
The trapping experiments and ESR tests confirmed that O2-, h+, and OH were the main active species in the photocatalytic degradation process of tetracycline by Fe-MIL-101. The Fe-O clusters in Fe-MIL-101 were excited under visible light, generating photogenerated electrons and holes. These active species effectively degraded tetracycline into smaller intermediates or end products.
Outlook:
This research provides a new potential application for Fe-based MILs in the practical treatment of tetracycline and other refractory antibiotics. The findings expand the application fields of Fe-MILs and offer valuable insights for the development of efficient and sustainable materials for environmental pollution control.
Simultaneously efficient adsorption and photocatalytic degradation of tetracycline by Fe-based MOFs
Authors: Dongbo Wang, Feiyue Jia, Hou Wang, Fei Chen, Ying Fang, Wenbo Dong, Guangming Zeng, Xiaoming Li, Qi Yang, Xingzhong Yuan
DOI: 10.1016/j.jcis.2018.02.067
Link: https://www.sciencedirect.com/science/article/pii/S0021979718302224
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