Quinone-modified metal-organic frameworks MIL-101(Fe) as heterogeneous catalysts of persulfate activation for degradation of aqueous organic pollutants

In this work, quinone-modified metal-organic framework MIL-101(Fe)(Q-MIL-101(Fe)), as a novel heterogeneous Fenton-like catalyst, was synthesized for the activation of persulfate (PS) to remove bisphenol A (BPA). The synthetic Q-MIL-101(Fe) was characterized via X-ray diffraction, scanning electron...

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Bibliographic Details
Published in:Water science and technology 2019-06, Vol.79 (12), p.2357-2365
Main Authors: Guo, Huaisu, Guo, Weilin, Liu, Yang, Ren, Xiaohua
Format: Article
Language:English
Subjects:
Activation
Analytical methods
Bisphenol A
Catalysis
Catalysts
Catalytic activity
Chemical synthesis
Chemistry
Coordination Complexes
Electrochemical impedance spectroscopy
Electrochemistry
Environmental science
Fourier transforms
Iron
Metal-Organic Frameworks
Metals
Organic contaminants
Oxidation
Oxidoreductions
pH effects
Photoelectron spectroscopy
Photoelectrons
Pollutants
Porous materials
Quinones
Redox properties
Researchers
Scanning electron microscopy
Spectroscopy
Temperature
Water Pollutants, Chemical - chemistry
X rays
X-ray diffraction
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Summary:In this work, quinone-modified metal-organic framework MIL-101(Fe)(Q-MIL-101(Fe)), as a novel heterogeneous Fenton-like catalyst, was synthesized for the activation of persulfate (PS) to remove bisphenol A (BPA). The synthetic Q-MIL-101(Fe) was characterized via X-ray diffraction, scanning electron microscope, Fourier transform infrared, electrochemical impedance spectroscopy, cyclic voltammetry and X-ray photoelectron spectroscopy. As compared to the pure MIL-101(Fe), Q-MIL-101(Fe) displayed better catalytic activity and reusability. The results manifested that the Q-MIL-101(Fe) kept quinone units, which successfully promoted the redox cycling of Fe /Fe and enhanced the removal efficiency. In addition, the reaction factors of Q-MIL-101(Fe) were studied (e.g. pH, catalyst dosage, PS concentration and temperature), showing that the optimum conditions were [catalyst] = 0.2 g/L, [BPA] = 60 mg/L, [PS] = 4 mmol/L, pH = 6.79, temperature = 25 °C. On the basis of these findings, the probable mechanism on the heterogeneous activation of PS by Q-MIL-101(Fe) was proposed.
ISSN:0273-1223
1996-9732
DOI:10.2166/wst.2019.239