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Enhanced Fenton-like catalysis by iron-based metal organic frameworks for degradation of organic pollutants
Summary:
The authors from the Dalian University of Technology developed a MIL-88B-Fe material with abundant active sites and a flexible structure, achieving high catalytic activity and stability in the degradation of organic pollutants in the field of water treatment.
Background:
1. To address the problem of traditional homogeneous catalysts being difficult to recover and restricted to acidic conditions, previous researchers developed various iron oxides and supported iron catalysts, achieving some success. However, these catalysts generally show low activity for generating hydroxyl radicals (OH) due to limited exposed active sites and difficulty in reducing Fe(III) to Fe(II).
2. The authors in this study proposed using an iron-based metal organic framework (MIL-88B-Fe) as a heterogeneous Fenton-like catalyst, obtaining significantly enhanced catalytic performance over a wide pH range (4–6).
Research Content:
1. Synthesis:
The authors synthesized MIL-88B-Fe using the solvothermal method.
2. Characterizations:
1) BET results show a surface area of 165.4 m²/g with a pore volume of 0.2 cm³/g.
2) SEM/TEM tests show the needle-like morphology of the material with a uniform size of 0.8–1 µm in length and 100 nm in width.
3) Other tests include XRD, IR, TG, and XPS.
3. Application:
The material was tested in the degradation of phenol, achieving 99% removal efficiency within 30 minutes at pH 4 with a pseudo-first-order kinetic constant of 0.15 min⁻¹.
4. Mechanism:
The analysis of the experiment results indicates that hydroxyl radicals generated from the reaction between MIL-88B-Fe and H₂O₂ are the main reactive oxidative species for phenol degradation. The flexible structure and electron-rich organic ligands facilitate the reduction of Fe(III) to Fe(II), enhancing the catalytic performance.
Outlook：
This research provides new insights into the design and development of highly effective Fenton-like catalysts, with MIL-88B-Fe showing great potential for practical applications in water treatment due to its high activity, stability, and wide pH range.
Enhanced Fenton-like catalysis by iron-based metal organic frameworks for degradation of organic pollutants
Authors: Cong Gao, Shuo Chen, Xie Quan, Hongtao Yu, Yaobin Zhang
DOI: 10.1016/j.jcat.2017.09.015
Link: https://www.sciencedirect.com/science/article/pii/S0021951717303378
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